JPH11302650A - Chiral smectic liquid crystal mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the characteristics of a ferroelectric liq. crystal display by using a chiral nonracemic tilted smectic liq. crystal mixture contg. a 2,6- disubstd. quinoxaline deriv. and a compd. selected from among phenanthrene derivs., 2-fluoropyridine derivs., etc. SOLUTION: This liq. crystal mixture contains a 2,6-disubstd. quinoxaline deriv. of the formula [wherein R<1> and R<2> are each independently (a) H, F, Cl, CN, CF3 , or OCF3 or (b) a 1-20C alkyl, provided-CH2 -, H, F, etc., at specified positions may be replaced by specific groups and a terminal methyl group may be replaced by a chiral group (optically active or racemic); Y<1> to Y<3> are each CF or CH; M<1> to M<4> are each a single bond, COO, CH2 O, or the like; A<1> to A<4> are each 1,4-phenylene, pyridine-2,5-diyl, or the like; a to d are each 0 or 1; and the number of 5-or 6-membered rings is less than 5] and at least one compd., pref. 3-25 compds., selected from compds. belonging to any one of 6 groups, such as the group of phenanthrene derivs., the group of 2- fluoropyridine derivs., the group of phenylene derivs., etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to chiral smectic liquid crystal mixtures. More specifically, chiral non-racemic tilted smectic (hereinafter referred to as ferroelectric)
The present invention relates to a liquid crystal mixture, particularly to a liquid crystal mixture which exhibits a high switching speed when driven at a low voltage, and a liquid crystal display device using the liquid crystal mixture.

[0002]

2. Description of the Related Art In 1980, a surface stabilized ferroelectric liquid crystal (SSFLC) was discovered by Clark and Lagerwall [N. A. Clark, S.M. T. Lagerwal
1, Appl; Phys. Lett. , 36,899
(1980)] These liquid crystals are attracting attention as next-generation display materials, and much research has been made on them.
The reasons are (1) that the ferroelectric liquid crystal (FLC) has a high-speed response, (2) that it has a memory characteristic capable of displaying a large amount of information, and that an active element (such as a thin film transistor) is used. Since it is not required, it can be manufactured at a relatively low cost, and (3) the viewing angle is wide. Therefore, these liquid crystals are expected to be useful as a display device having a large screen and a large display capacity.

In the practical application of ferroelectric liquid crystal (FLC) display elements, achieving a highly defined contrast is important. It is difficult to achieve the expected level of highly defined contrast using ferroelectric liquid crystals. The reasons include, for example, zigzag defects in the smectic C phase, a decrease in the effective cone angle due to the chevron structure, and insufficient memory properties. Various proposals have been made for achieving a highly defined contrast. For example, a method using an obliquely deposited film as an alignment film, a method using a high pretilt alignment film C
One uniform method, a method using an AC electric field treatment or a pseudo bookshelf structure using a naphthalene compound, and a method using a material having negative dielectric anisotropy. Among these methods, the method using a material having a negative dielectric anisotropy (△ ε) has a phenomenon that when a high-frequency electric field is applied perpendicularly to the electrode substrate, liquid crystal molecules having a negative △ ε are arranged in parallel with the electrode substrate. It was used. This phenomenon is called an AC stabilization effect.

[0004] Multiplex FLC devices can be operated in two different ways, the so-called "normal mode" and the so-called "reverse mode", the latter sometimes being called "τ".
It is also called “V _min mode” or “negative dielectric mode.” The difference between the two modes is the addressing scheme,
And the requirements for the dielectric tensor of the FLC material, ie the FLC mixture, are different. An overview is, for example,
J. C. Jones, M .; J. Towler, J .; R.
"Fast High controller by Hughes
ast Ferroelectric Liquid
CrystalDisplays and the R
ole of DielectricBiaxiali
ty ”, Volume 14, No. 2 (1993) 86
−93 (hereinafter referred to as Jones); M, Koden, F
erroelectrics 179, 121 (199
6) and the references cited therein.

Generally, the switching characteristics of FLC are J
Ones can be discussed by a graph of the drive voltage (V) on the horizontal axis and the drive pulse width (τ, time) on the vertical axis, as in FIGS.

The switching curve is measured by experiment,
Divide the V, τ region into switching and non-switching parts. Generally, as the voltage increases, the pulse width required for switching decreases. Such behavior is what is called “normal mode” FCL within the applied drive voltage range.
Commonly found in devices.

However, for a suitable material, V, τ
The curves are, for example, in FIGS. 8, 10, 11 of Jones.
As shown in FIG._minAt), then
Indicates an increase in voltage due to overlapping of dielectric and ferroelectric torque
You. Within the operating temperature range, the sum of the row and column drive voltages is
If it is higher than the minimum voltage of the V, τ curve,
_row+ V_col> V_minThen the FLC element works in reverse mode
Good. Otherwise, work in the so-called standard mode.

An example of this drive mode is described in W. H. Su
rguy et al., Ferroelectrics 199
1, 122, 63 (hereinafter referred to as Surguy) and P.I. W. Ross, Proc. SID, 1992, 21
7.

In the Surguy, the switching is | V _s −
V _d | of working in voltage but, | V _s + V _d | or | V _d | voltages have reported drive system does not work with (V _s: strobe pulse; V _d: data pulses).

The drive voltage of the system is (τ-V
_min ) determined by the characteristics. According to Surguy, the V _min value is defined as:

[0011]

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In the above formula, E _min is the minimum value of the electric field strength; d is the cell thickness; P _s is the spontaneous polarization;
Θ is the tilt angle of the liquid crystal material.

Further, when biaxial anisotropy (δε) is considered, M. J. Towler et al. (Liquid Crys
tal 1992, Bd. 11) is the following V _min
And have obtained values of τ _min :

[0014]

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(Η: viscosity) However, the response speed of the ferroelectric liquid crystal material disclosed by Ross et al. Is still slow, and | V _s + V _d | exceeds 55 V, which is not very practical.

Another ferroelectric liquid crystal mixture suitable for a driving system utilizing the AC stabilizing effect or a driving system utilizing the τ- _Vmin characteristic is, for example, EP-A 0 32
2793, EP-A 0 345 091, EP-A
0 453 309, EP-A 0 210 215,
WO-A 89/02425 and WO-A 89/0
8690.

[0017]

However, since the development of ferroelectric liquid crystal mixtures can never be considered complete, display manufacturers are interested in a very wide range of mixtures. This is also due to the fact that it is only possible to conclude on the quality of the liquid crystal mixture by the interaction of the liquid crystal mixture with the individual components of the display element or cell (eg alignment film).

[0018] Therefore, an object of the present invention, a ferroelectric liquid crystal display, suitable in particular ((τ-V _min) characteristics using a) Improvement of ferroelectric liquid crystals (FLC) characteristics of the display to be operated in reverse mode To provide a ferroelectric liquid crystal mixture.

[0019]

SUMMARY OF THE INVENTION The present invention provides a chiral non-racemic tilted smectic liquid crystal mixture comprising a compound of the following group A and further a compound of any of the following groups BG: A. 2,6-disubstituted quinoxaline derivatives of formula (I)

[0020]

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Wherein R ¹ and R ² are independently of one another: (a) a hydrogen atom, —F, —Cl, —CN, —CF
₃ or -OCF _3, (b) 1 to 20 amino (with or without asymmetric carbon atoms) linear or branched alkyl group having carbon atoms, wherein, b1) 1 or more non-adjacent and non terminal -CH ₂ - group, -O -, - S -, - CO -, - CO-O -, - O-
CO -, - O-CO- O- or -Si (CH ₃₎ may be replaced by _2, and / or, b2) 1 or more -CH ₂ - groups, -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-phenylene, cyclopropane-1,2-diyl or 1,3
- may be replaced by cyclopentylene, and / or b3) 1 or more hydrogen atoms of the alkyl group may be replaced by F and / or Cl, and / or b4) terminal CH ₃ group May be replaced by any one of the following chiral groups (optically active or racemic):

[0022]

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[0023]

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Where R¹, R^TwoOnly one of them is hydrogen
Atom, -F, -Cl, -CN, -CF _ThreeOr -OCF_Three
R^Three, R^Four, R^Five, R⁶, R⁷Are each other
Independently of: a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
Y;¹, Y^TwoAnd Y^ThreeAre independent of each other
And is —CF— or —CH—;¹, M^Two,
M^Three, M^FourAre, independently of one another, -CO-O-, -OC
O-, -CH _Two-O-, -O-CH_Two-, -CH_Two-CH_Two
-, -CH = CH-, -C≡C-, -CH_Two-CH_Two-C
O-O-, -O-CO-CH_Two-CH_Two-Or with a single bond
Yes; A¹, A^Two, A^Three, A^FourAre independent of one another
The above H atom is replaced by F, Cl and / or CN
1,4-phenylene, one H atom being replaced by F
Optionally substituted pyridine-2,5-diyl, pyrimi
Gin-2,5-diyl, one H atom being replaced by F
Optionally pyrazine-2,5-diyl, one H atom is
Pyridazine-3,6-dii which may be substituted by F
And one or two hydrogen atoms are CN and / or F
And / or CH_Three1,4- which may be substituted
Cyclohexylene, wherein one or more H atoms is F, Cl and
And / or naphthalene-2, optionally substituted with CN,
6-diyl, one or two H atoms being replaced by F
Thiophene-2,5-diyl, [1,3,
4] -thiadiazole-2,5-diyl, one H atom
Is optionally substituted with F [1,3] -thiazole-
2,4-diyl, even if one H atom is substituted by F
Good [1,3] -thiazol-2,5-diyl, or
1,3-dioxane-2,5-diyl; a, b,
c and d are 0 or 1, provided that the compound of the formula (I)
Must not contain more than four 5- or 6-membered ring systems
B]. Phenanthrene derivatives of formula (II):

[0025]

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Wherein E ¹ , E ² , E ³ , E ⁴ , E ⁵ and E ⁶ are —N—, —CF— or —CH—, provided that E ¹ (E ⁴ ) is — If N- or -CF-, then E
² and E ³ (E ⁵ and E ⁶⁾ must be -CH-; E ² and / or E ³ (E ⁵ and E ⁶⁾ is -CF-
, E ¹ (E ⁴ ) must be —CH—;
If E ² (E ⁵ ) is —N—, then E ¹ (E ⁴ ) is —CH—
E ³ (E ⁶ ) can be —CH— or —CF—; and at least one of E ¹ -E ⁶ must be —N— or —CF—. Banara not a; G is -CH ₂ CH ₂ - or a -CH = CH-;
R ¹ and R ² are, independently of one another, (a) a hydrogen atom,
-F, -Cl, -CN, -CF ₃ or -OCF _3,
(B) straight-chain or branched-chain alkyl groups having 1 to 20 carbon atoms (with or without asymmetric carbon atoms), wherein b1) one or more non-adjacent and non-terminal -CH ₂ -groups Is -O-, -S-, -CO-, -CO-O-, -O-
CO -, - O-CO- O- or -Si (CH _{3) 2} - may be replaced by, and / or, b2) 1 or more -CH ₂ - groups, -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-phenylene, cyclopropane-1,2-diyl or 1,3
- may be replaced by cyclopentylene, and / or b3) 1 or more hydrogen atoms of the alkyl group may be replaced by F and / or Cl, and / or b4) terminal CH ₃ group May be replaced by any one of the following chiral groups (optically active or racemic):

[0027]

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[0028]

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Where R¹, R^TwoOnly one of them is hydrogen
Atom, -F, -Cl, -CN, -CF _ThreeOr -OCF_Three
R^Three, R^Four, R^Five, R⁶, R⁷Are each other
Independently of: a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
May be; M¹, M^TwoAre, independently of one another, -C
O-O-, -O-CO-, -CH_Two-O-, -O-CH_Two
-, -CH_Two-CH_Two-, -CH = CH-, -C≡C-,
-CH_Two-CH_Two-CO-O-, -O-CO-CH_Two-C
H_TwoA or a single bond;¹, A^TwoAre independent of each other
Wherein one or more H atoms is F, Cl and / or CN
Optionally substituted 1,4-phenylene, one H atom
Pyridine-2,5-dii, which may be substituted with F
, Pyrimidine-2,5-diyl, one H atom is F
Optionally substituted pyrazine-2,5-diyl, one
Pyridazine-3, wherein the H atom of may be substituted with F,
6-diyl, one or two hydrogen atoms are CN and / or
Or F and / or CH_ThreeMay be replaced by
1,4-cyclohexylene, thiophene-2,5-dii
[1,3,4] -thiadiazole-2,5-diyl
[1,3] -thiazole-2,4-diyl, [1,1
3] -thiazol-2,5-diyl or 1,3-di
Oxane-2,5-diyl; a and b are 0 or 1
With the proviso that the compound of formula (II) has four or more
Or a 6-membered ring system]; 2-fluoropyridine derivative of formula (III):

[0030]

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[Wherein, R ¹ and R ² independently represent (a) a hydrogen atom, -F, -Cl, -CN, -CF
₃ or -OCF _3, (b) 1 to 20 amino (with or without asymmetric carbon atoms) linear or branched alkyl group having carbon atoms, wherein, b1) 1 or more non-adjacent and non terminal -CH ₂ - group, -O -, - S -, - CO -, - CO-O -, - O-
CO -, - O-CO- O- or -Si (CH _{3) 2} - may be replaced by, and / or, b2) 1 or more -CH ₂ - groups, -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-phenylene, cyclopropane-1,2-diyl or 1,3
- may be replaced by cyclopentylene, and / or b3) 1 or more hydrogen atoms of the alkyl group may be replaced by F and / or Cl, and / or b4) terminal CH ₃ group May be replaced by any one of the following chiral groups (optically active or racemic):

[0032]

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[0033]

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Where R¹, R^TwoOnly one of them is hydrogen
Atom, -F, -Cl, -CN, -CF _ThreeOr -OCF_Three
R^Three, R^Four, R^Five, R⁶, R⁷Are each other
Independently of: a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
May be; M¹, M^Two, M^Three, M^FourAre independent of each other
To form -CO-O-, -O-CO-, -CH _Two-O-,
-O-CH_Two-, -CH_Two-CH_Two-, -CH = CH-,
-C≡C-, -CH_Two-CH_Two-CO-O-, -O-CO
-CH_Two-CH_TwoA or a single bond;¹, A^Two,
A^Three, A^FourIs, independently of one another, one or more H atoms is F,
1,4 optionally substituted with Cl and / or CN
Phenylene, one H atom of which may be replaced by F
Pyridine-2,5-diyl, pyrimidine-2,5-di
Yl, a pyrazine in which one H atom may be replaced by F
2,2,5-diyl, wherein one H atom is replaced by F
Pyridazine-3,6-diyl, one or two
Has a hydrogen atom of CN and / or F and / or CH
_Three1,4-cyclohexylene optionally substituted with
Replacing one or more H atoms with F, Cl and / or CN
Naphthalene-2,6-diyl, thiof
-2,5-diyl, [1,3,4] -thiadiazo
Ru-2,5-diyl, [1,3] -thiazole-2,4
-Diyl, [1,3] -thiazole-2,5-diyl,
Or 1,3-dioxane-2,5-diyl;
a, b, c, and d are 0 or 1, provided that the formula (II)
The compounds of I) contain more than four 5- or 6-membered ring systems.
Must not]; Phenylene derivative of formula (IV):

[0035]

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Wherein R ¹ and R ² independently of one another are (a) a hydrogen atom, -F, -Cl, -CN, -CF
₃ or -OCF _3, (b) 1 to 20 amino (with or without asymmetric carbon atoms) linear or branched alkyl group having carbon atoms, wherein, b1) 1 or more non-adjacent and non terminal -CH ₂ - group, -O -, - S -, - CO -, - CO-O -, - O-
CO -, - O-CO- O- or -Si (CH _{3) 2} - may be replaced by, and / or, b2) 1 or more -CH ₂ - groups, -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-phenylene, cyclopropane-1,2-diyl or 1,3
- may be replaced by cyclopentylene, and / or b3) 1 or more hydrogen atoms of the alkyl group may be replaced by F and / or Cl, and / or b4) terminal CH ₃ group May be replaced by any one of the following chiral groups (optically active or racemic):

[0037]

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[0038]

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Where R¹, R^TwoOnly one of them is hydrogen
Atom, -F, -Cl, -CN, -CF _ThreeOr -OCF_Three
R^Three, R^Four, R^Five, R⁶, R⁷Are each other
Independently of: a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
X;¹And X^TwoAre independent of each other,
Hydrogen, F, Cl, CF_ThreeOr CN, where X¹
And X^TwoIs not simultaneously hydrogen; M¹, M^Two, M^Three, M^Four
Are, independently of one another, -CO-O-, -O-CO-,-
CH _Two-O-, -O-CH_Two-, -CH_Two-CH_Two-, -C
H = CH-, -C≡C-, -CH_Two-CH_Two-CO-O
-, -O-CO-CH_Two-CH_Two-Or a single bond;
A¹, A^Two, A^Three, A^FourAre, independently of one another, one or more H
Even if the atom is replaced by F, Cl and / or CN
Good 1,4-phenylene, one H atom being replaced by F
Pyridine-2,5-diyl, pyrimidine-
2,5-diyl, even if one H atom is substituted by F
Good pyrazine-2,5-diyl, one H atom replaced by F
Optionally substituted pyridazine-3,6-diyl, one
Or two hydrogen atoms are CN and / or F and / or
Or CH_Three1,4-cyclohe optionally substituted by
Xylene, wherein one or more H atoms is F, Cl and / or
Naphthalene-2,6-dii which may be substituted by CN
1,2,3,4-tetrahydronaphthalene-2,6
-Diyl, thiophene-2,5-diyl, [1,3
4] -Thiadiazole-2,5-diyl, [1,3]-
Thiazole-2,4-diyl, [1,3] -thiazole
-2,5-diyl or 1,3-dioxane-2,5
A, b, c, d is 0 or 1;
Provided that the compound of the formula (IV) has 5 or more 5 or 6 members
Ring systems must not be included]; Meta-substituted aromatic compounds of formula (V):

[0040]

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Wherein X ³ is (a) —F, —Cl,
—Br, —CN, —CF ₃ or —OCF ₃ , (b) 1
Straight or branched chain alkyl group with or without -12 carbon atoms (with or without asymmetric carbon atoms), wherein
b1) 1 or 2 non-adjacent and non-terminal -CH ₂
The group may be replaced by -O-, -S-, -CO-, -CO-O- or -O-CO-, and / or
Or b2) one or more hydrogen atoms of the alkyl group is
R ¹ may be substituted with F and / or Cl and / or CN; R ¹ is (a) a hydrogen atom, —F, —C
l, -CN, -CF ₃ or -OCF _3, (b) 1~2
0 straight or branched chain alkyl group having carbon atoms (without or with asymmetric carbon atoms), wherein, b1) 1 or more non-adjacent and non-terminal -CH ₂ - group, -O- , -S-, -CO-, -CO-O-, -O-
CO -, - O-CO- O- or -Si (CH _{3) 2} - may be replaced by, and / or, b2) 1 or more -CH ₂ - groups, -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-phenylene, cyclopropane-1,2-diyl or 1,3
- may be replaced by cyclopentylene, and / or b3) 1 or more hydrogen atoms of the alkyl group may be replaced by F and / or Cl, and / or b4) terminal CH ₃ group May be replaced by any one of the following chiral groups (optically active or racemic):

[0042]

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[0043]

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Wherein X ³ is -F, -Cl, -Br,-
If CN, —CF ₃ or —OCF ₃ , R ¹ is a hydrogen atom, —F, —Cl, —CN, —CF ₃ or —OC
A F ₃ must ^{not; R 3, R 4, R} 5, R 6, R 7 , independently of one another, a) straight or branched having a hydrogen atom, b) 1 to 16 carbon atoms Branched alkyl groups (with or without asymmetric carbon atoms),
Here, b1) 1 or more non-adjacent and non-terminal -CH ₂ - groups may be replaced by -O-, and / or, b2) 1 or 2 -CH ₂ - group is -CH = CH
- may be replaced by, and / or b3) 1 or more hydrogen atoms of the alkyl group may be substituted by F or Cl, c) R ⁴ and R ^5, oxirane, dioxolane, tetrahydrofuran , tetrahydropyran, if're bound to butyrolactone or valerolactone system, together - (CH _{2) 4} - or - (CH _{2) 5} - may be, and is; M ^1, M ² and M ³ are each independently —CO—O—, —O—CO—, —CH ₂ —O—,
_{O-CH 2 -, - CH} 2 -CH 2 -, - CH = CH -, -
_{C≡C -, - CH 2 -CH 2} -CO-O -, - O-CO-
A ¹ , A ² , A is CH ₂ —CH ₂ — or a single bond;
³ is, independently of one another, 1,4-phenylene in which one or more H atoms can be substituted by F, Cl and / or CN, pyridine-in which one H atom can be substituted by F 2,5-diyl, pyrimidine-2,5-diyl,
Pyrazine wherein one H atom may be substituted by F
2,5-diyl, pyridazine-3,6-diyl, one H atom of which may be substituted with F, one or two hydrogen atoms of which are substituted with CN and / or F and / or CH ₃ 1,4-cyclohexylene, naphthalene-2,6-diyl, thiophen-2,5-diyl, in which one or more H atoms may be substituted by F, Cl and / or CN, [1,3 , 4] -Thiadiazole-
2,5-diyl, [1,3] -thiazol-2,4-diyl, [1,3] -thiazol-2,5-diyl, or 1,3-dioxane-2,5-diyl; a ,
b, c are 0 or 1, provided that the compound of formula (V) must not contain more than 4 5 or 6 membered ring systems]; (1,3,4) -thiadiazole of formula (VI):

[0045]

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[Wherein R ¹ and R ² independently represent (a) a hydrogen atom, -F, -Cl, -CN, -CF
₃ or -OCF _3, (b) 1 to 20 amino (with or without asymmetric carbon atoms) linear or branched alkyl group having carbon atoms, wherein, b1) 1 or more non-adjacent and non terminal -CH ₂ - group, -O -, - S -, - CO -, - CO-O -, - O-
CO -, - O-CO- O- or -Si (CH _{3) 2} - may be replaced by, and / or, b2) 1 or more -CH ₂ - groups, -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-phenylene, cyclopropane-1,2-diyl or 1,3
- may be replaced by cyclopentylene, and / or b3) 1 or more hydrogen atoms of the alkyl group may be replaced by F and / or Cl, and / or b4) terminal CH ₃ group May be replaced by any one of the following chiral groups (optically active or racemic):

[0047]

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[0048]

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Where R¹, R^TwoOnly one of them is hydrogen
Atom, -F, -Cl, -CN, -CF _ThreeOr -OCF_Three
R^Three, R^Four, R^Five, R⁶, R⁷Are each other
Independently of: a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
X;¹, X^Two, X^ThreeAre independent of each other
M, -CF-, -N- or -CH-;¹, M^Two
Are, independently of one another, -CO-O-, -O-CO-,-
CH_Two-O-, -O-CH_Two-, -CH_Two-CH_Two-, -C
H = CH-, -C≡C-, -CH_Two-CH_Two-CO-O
-, -O-CO-CH_Two-CH_Two-Or a single bond;
A¹, A^Two, A^ThreeIs independently one or more H atoms
May be substituted with F, Cl and / or CN
1,4-phenylene, wherein one H atom is substituted by F
Pyridine-2,5-diyl, pyrimidine-2,
5-diyl, one H atom optionally substituted by F
Pyrazine-2,5-diyl, one H atom being replaced by F
Optionally pyridazine-3,6-diyl, one or more
Means that two hydrogen atoms are CN and / or F and / or
Is CH_Three1,4-cyclohexyl optionally substituted with
Ren, where one or more H atoms is F, Cl and / or CN
Naphthalene-2,6-diyl which may be substituted with
Thiophene-2,5-diyl, [1,3,4] -thiazi
Azole-2,5-diyl, [1,3] -thiazole-
2,4-diyl, [1,3] -thiazole-2,5-di
Or 1,3-dioxane-2,5-diyl
A, b, c are 0 or 1, provided that the formula (V
The compounds of I) contain more than four 5- or 6-membered ring systems.
G. 4-cyanocyclohexyl of formula (VII):

[0050]

Embedded image

[Wherein, R ¹ represents (a) a hydrogen atom,-
F, -Cl, -CN, -CF ₃ or -OCF _3, (b)
1-20 straight or branched chain alkyl group having carbon atoms (with or without asymmetric carbon atoms), wherein, b1) 1 or more non-adjacent and non-terminal -CH ₂ - group, - O-, -S-, -CO-, -CO-O-, -O-
CO -, - O-CO- O- or -Si (CH _{3) 2} - may be replaced by, and / or, b2) 1 or more -CH ₂ - groups, -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-phenylene, cyclopropane-1,2-diyl or 1,3
- may be replaced by cyclopentylene, and / or b3) 1 or more hydrogen atoms of the alkyl group may be replaced by F and / or Cl, and / or b4) terminal CH ₃ group May be replaced by any one of the following chiral groups (optically active or racemic):

[0052]

Embedded image

[0053]

Embedded image

R ² is (a) a linear or branched alkyl group having 1 to 16 carbon atoms (with or without asymmetric carbon atoms), wherein: a1) one or two non-adjacent and non-terminal -CH ₂
-Groups are -O-, -S-, -CO-, -CO-O-,-
O-CO- or -Si (CH _{3) 2} - may be replaced by, and / or, a2) 1 or 2 -CH ₂ - group, -CH = C
H-, -C≡C-, and / or a3) one or more hydrogen atoms of the alkyl group is F and / or Cl and / or CN and / or CF ₃
R ³ , R ⁴ , R ⁵ , R ⁶ , R
⁷ are, independently of one another, a) a hydrogen atom, b) a linear or branched alkyl group having 1 to 16 carbon atoms (with or without an asymmetric carbon atom);
Here, b1) 1 or more non-adjacent and non-terminal -CH ₂ - groups may be replaced by -O-, and / or, b2) 1 or 2 -CH ₂ - group is -CH = CH
- it may be replaced by, and / or b3) 1 or more hydrogen atoms of the alkyl group may be substituted by F or Cl; c) R ⁴ and R ^5, oxirane, dioxolane, tetrahydrofuran , tetrahydropyran, if're bound to butyrolactone or valerolactone system, together - (CH _{2) 4} - or - (CH _{2) 5} - may be, and is; M ^1, M ² independently of one another,
O-O -, - O- CO -, - CH 2 -O -, - O-CH 2
_{-, - CH 2 -CH 2 -} , - CH = CH -, - C≡C-,
_{-CH 2 -CH 2 -CO-O -} , - O-CO-CH 2 -C
H ₂ - or a single bond; A ^1, A ^2, independently of one another, one or more H atoms are F, Cl and / or may be substituted by CN 1,4-phenylene, one Pyridine-2,5-diyl, pyrimidine-2,5-diyl wherein the H atom may be substituted with F, pyrazine-2,5-diyl wherein one H atom may be substituted with F, Pyridazine-3, in which the H atom may be substituted by F,
6-diyl, one or two hydrogen atoms are CN and / or
Or 1,4-cyclohexylene optionally substituted with F and / or CH ₃ , wherein one or more H atoms are F, C
naphthalene-2,6-diyl, thiophen-2,5-diyl optionally substituted with 1 and / or CN,
[1,3,4] -thiadiazole-2,5-diyl,
[1,3] -thiazol-2,4-diyl, [1,3]
-Thiazole-2,5-diyl or 1,3-dioxane-2,5-diyl; a and b are 0 or 1, provided that the compound of the formula (VII) has 5 or more 5 or 6 Must not contain any ring systems].

It is a further object of the present invention to provide a ferroelectric liquid crystal display, particularly one which operates in the τV _min mode using the above mixture.

Another object of the invention is the use of the above mixtures in ferroelectric liquid crystal displays, especially those operated in τV _min mode.

The mixture of the present invention is particularly characterized by a large absolute value of dielectric anisotropy, a low viscosity, a low melting point, and supercoolability. These can achieve fast response speed and low voltage drivability.

Preferred compounds are those of Group A, in which the symbols of the formula (I) have the following meanings: R ¹ and R ²
Are, independently of each other, (a) a hydrogen atom, (b)
Linear or branched alkyl groups having 16 carbon atoms (with or without asymmetric carbon atoms), wherein b1) one or two non-adjacent and non-terminal -CH ₂
The group is -O-, -CO-O-, -O-CO- or-
Si (CH ₃ ) ₂ , and / or
Or, b2) 1 single -CH ₂ - group, trans-1,4-cyclohexylene may be replaced by 1,4-phenylene or cyclopropane-1,2-diyl, and / or b3) alkyl One or more hydrogen atoms of the group may be replaced by F, and / or b4) the terminal CH ₃ group is replaced by any one of the following chiral groups (optically active or racemic) Well:

[0059]

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Where R¹, R^TwoOnly one of them is hydrogen
Can be an atom; R^Three, R^Four, R^Five, R⁶, R⁷Is
Independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 12 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Where b1) one non-terminal —CH_Two-Group is replaced by -O-
And / or c) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
Y;¹, Y^TwoAnd Y^ThreeAre independent of each other
And is —CF— or —CH—;¹, M^Two,
M^Three, M^FourAre, independently of one another, -CO-O-, -OC
O-, -CH _Two-O-, -O-CH_Two-Or a single bond
A;¹, A^Two, A^Three, A^FourAre independent of each other
Is a 1,4-phenyl group in which two H atoms may be substituted with F.
Phenylene, a pyrene having one H atom optionally substituted with F;
Lysine-2,5-diyl, pyrimidine-2,5-dii
, Pyrazine-2,5-diyl, trans-1,4-si
Clohexylene, one or two H atoms replaced by F
Thiophene-2,5-diyl, [1,
3,4] -thiadiazole-2,5-diyl, or 1
[1,3] -H wherein two H atoms may be replaced by F
Azole-2,5-diyl.

Examples of particularly preferred compounds of the formula (I) are:

[0062]

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[0063]

Embedded image

[0064]

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(Wherein R and R ′ are the same as R ^{1 of the} formula (I))
And R ² ). Even more particularly preferred compounds are those wherein R ¹ and R ² are straight or branched chain alkyl groups with or without asymmetric carbon atoms having 1 to 14 carbon atoms, wherein one or two One of the -CH ₂ - group is -O-, it may be replaced by cyclopropane-1,2-diyl or -Si (CH _{3) 2,} where oxygen atoms must not be bonded directly to one another A compound of formula (I), wherein one or more hydrogen atoms of the alkyl group may be replaced by F; R ¹ or R ² may be hydrogen, but not both simultaneously hydrogen.

Highly preferred compounds are those of the following formula (I):

[0067]

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(Wherein n and m are, independently of each other,
0 to 16 (where 3 <n + m <29), and q and p are each independently 0 or 1).

Preferred compounds are those of Group B, in which the symbols of the formula (II) have the following meanings: E ¹ , E ² ,
E ³ , E ⁴ , E ⁵ and E ⁶ represent —N—, —CF— or —
CH-, provided that E ¹ and / or E ⁴ are -N-
Or if it is ^{-CF-, E 2, E 3,} E 5 and E ⁶ must be -CH-; E ² and / or E ³ and / or E ⁵ and / or E ⁶ is -CF- And E ¹ and E ⁴ must be —CH—; if E ² and / or E ⁵ are —N—, then E ¹ and E ⁴ must be —CH—, while , E ³ and / or E ⁶ may be -CH- or -CF-; and at least one -N- or -C of E ¹ to E ⁶
R ¹ and R ² independently of one another are (a) a hydrogen atom, (b) a straight-chain or branched alkyl group having 1 to 16 carbon atoms (asymmetric carbon atom B1) one or two non-adjacent and non-terminal -CH ₂
The group is -O-, -CO-O-, -O-CO- or-
Si (CH ₃ ) ₂ , and / or
Or, b2) 1 single -CH ₂ - group, trans-1,4-cyclohexylene may be replaced by 1,4-phenylene or cyclopropane-1,2-diyl, and / or b3) alkyl One or more hydrogen atoms of the group may be replaced by F, and / or b4) the terminal CH ₃ group is replaced by any one of the following chiral groups (optically active or racemic) Well:

[0070]

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However, only one of R ¹ and R ² can be a hydrogen atom; R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ are
Independently of one another: a) a hydrogen atom, b) a straight-chain or branched alkyl group having 1 to 12 carbon atoms (with or without asymmetric carbon atoms);
Wherein b1) one non-terminal —CH ₂ — group may be replaced by —O— and / or c) R ⁴ and R ⁵ are oxirane, dioxolane, tetrahydrofuran, tetrahydropyran, butyrolactone or if you are bound to valerolactone system, together are - (CH _{2) 4} - or - (CH _{2) 5} -, which may be, a and; M ^1, M ² are, independently of one another And -C
O-O -, - O- CO -, - CH 2 -O -, - O-CH 2
Or a single bond; A ¹ and A ² independently of one another
1,4-phenylene in which one or two H atoms may be substituted with F, pyridine-2,5-diyl, pyrimidine-2, in which one H atom may be substituted with F,
5-diyl, trans-1,4-cyclohexylene, thiophen-2,5-diyl, [1,3,4] -thiadiazole-2,5-diyl, [1,3] -thiazole-
2,5-diyl.

Particularly preferred compounds are those of formula (IIa) wherein E ¹ and / or E ⁴ are --CF--:

[0073]

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Wherein R and R ′ are the same as those of formula (II)
¹ and R ² ), of which very particular preference is given to the following compounds:

[0075]

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Wherein R and R ′ are the same as those of formula (II)
¹ and R ² ). Even very particularly preferred compounds are those in which R ¹ and R ² are straight-chain or branched-chain alkyl groups having ^{1 to} 16 carbon atoms (with or without asymmetric carbon atoms), wherein one or two -CH ₂ - groups are -O-, cyclopropane-1,2
- may be replaced by diyl or -Si (CH _{3) 2,} where oxygen atoms must not be bonded directly to each other; one or more hydrogen atoms of the alkyl group is optionally substituted with F R ¹ or R ² may be hydrogen, but not both may be hydrogen at the same time.

Particularly preferred compounds further include E ² , E ³ ,
E ⁵ and E ⁶ independently of one another, -CH-, or -C
F-, at least one of which is -CF-
Formula (IIb) which is:

[0078]

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Compounds of the formula wherein R ¹ and R ² have the same meaning as in formula (II), among which very particular preference is given to the following compounds:

[0080]

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Wherein R and R ′ are the same as those of formula (II)
¹ and R ² ). Even very particularly preferred compounds are those in which R ¹ and R ² are straight-chain or branched-chain alkyl groups having ^{1 to} 16 carbon atoms (with or without asymmetric carbon atoms), wherein one or two -CH ₂ - groups are -O-, cyclopropane-1,2
- may be replaced by diyl or -Si (CH _{3) 2,} where oxygen atoms must not be bonded directly to each other; one or more hydrogen atoms of the alkyl group is optionally substituted with F A compound of formula (IIb), wherein R ¹ or R ² may be hydrogen, but not both may be hydrogen at the same time.

Preferred compounds of component C, ie the 2-fluoropyridine derivatives of the formula (III), are those whose symbols have the following meanings: R ¹ and R ² are, independently of one another, (a) hydrogen Atoms, (b) linear or branched alkyl groups having 1 to 16 carbon atoms (with or without asymmetric carbon atoms), wherein b1) one or two non-adjacent and non-terminal -CH _Two
The group is -O-, -CO-O-, -O-CO- or-
Si (CH ₃ ) ₂ , and / or
Or b2) one or more hydrogen atoms of the alkyl group may be replaced by F, and / or b3) the terminal CH ₃ group may be any one of the following chiral groups (optically active or racemic) May be replaced by:

[0083]

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Where R¹, R^TwoOnly one of them is hydrogen
Can be an atom; R^Three, R^Four, R^Five, R⁶, R⁷Is
Independently of each other, a) a hydrogen atom, b) 1-12
Straight-chain or branched alkyl groups having carbon atoms (unsymmetric
With or without carbon atoms), where b1) one non-terminal -CH_Two-Group is replaced by -O-
And / or c) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
May be; M¹, M^Two, M^Three, M^FourAre independent of each other
To form -CO-O-, -O-CO-, -CH _Two-O-,
-O-CH_TwoA or a single bond;¹, A^Two, A^Three, A
^FourIs, independently of one another, one or two H atoms are F
Optionally substituted 1,4-phenylene, one H atom
Pyridine-2,5-dii, which may be substituted with F
, Pyrimidine-2,5-diyl, trans-1,4-
Cyclohexylene, naphthalene-2,6-diyl, thio
Phen-2,5-diyl or [1,3] -thiazoe
Ru-2,5-diyl.

Examples of particularly preferred compounds of the formula (III) are:

[0086]

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[0087]

Embedded image

Wherein R and R ′ have the same meaning as R ¹ and R ² in formula (III). More particularly preferred compounds are those wherein R ¹ and R ² are straight or branched chain alkyl groups having ^{1 to} 16 carbon atoms (with or without asymmetric carbon atoms), wherein one or two One of the -CH ₂ - group is -O-, it may be replaced by cyclopropane-1,2-diyl or -Si (CH _{3) 2,} where oxygen atoms must not be bonded directly to one another A compound of formula (III), wherein one or more hydrogen atoms of the alkyl group may be replaced by F; R ¹ or R ² may be hydrogen, but not both.

Highly preferred compounds are of the formula (III)
Is a compound of:

[0090]

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(Wherein n and m are, independently of each other,
0 to 16 (where 3 <n + m <29), and q and p are each independently 0 or 1).

Group D, ie preferred compounds of the formula (IV), are those in which the symbols of the formula (IV) have the following meanings: R ¹ and R ² are, independently of one another, (a)
A hydrogen atom, (b) a linear or branched alkyl group having 1 to 16 carbon atoms (with or without an asymmetric carbon atom), wherein b1) one or two non-adjacent and non-terminal- CH ₂
The group is -O-, -CO-O-, -O-CO- or-
Si (CH ₃ ) ₂ , and / or
Or b2) one or more hydrogen atoms of the alkyl group may be replaced by F, and / or b3) the terminal CH ₃ group may be any one of the following chiral groups (optically active or racemic) May be replaced by:

[0093]

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Here, R¹, R^TwoOnly one of them is hydrogen
Can be an atom; R^Three, R^Four, R^Five, R⁶, R⁷Is
Independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 12 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Where b1) one non-terminal —CH_Two-Group is replaced by -O-
And / or c) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
X;¹And X^TwoAre independent of each other,
Selected from hydrogen, CN and F, with the proviso that X¹and
X^TwoAre not simultaneously hydrogen; preferably X¹And / or
Is X^TwoIs F; M¹, M^Two, M^Three, M^FourAre independent of each other
To form -CO-O-, -O-CO-, -CH _Two-O-,
-O-CH_TwoA or a single bond;¹, A^Two, A^Three, A
^FourIs, independently of one another, one or two H atoms are F
Optionally substituted 1,4-phenylene, one H atom
Pyridine-2,5-dii, which may be substituted with F
, Pyrimidine-2,5-diyl, trans-1,4-
Cyclohexylene or naphthalene-2,6-diyl
It is.

Examples of particularly preferred compounds of the formula (IV) are:

[0096]

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[0097]

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Wherein R and R ′ are the same as those of formula (IV)
¹ and R ² ). More particularly preferred compounds are those wherein R ¹ and R ² are straight or branched chain alkyl groups having ^{1 to} 16 carbon atoms (with or without asymmetric carbon atoms), wherein one or two One of the -CH ₂ - group is -O-, it may be replaced by cyclopropane-1,2-diyl or -Si (CH _{3) 2,} where oxygen atoms must not be bonded directly to one another A compound of formula (IV), wherein one or more hydrogen atoms of the alkyl group may be replaced by F; R ¹ or R ² may be hydrogen, but not both simultaneously hydrogen.

Very particularly preferred compounds are of the formula (I)
V) is a compound of:

[0100]

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[0101]

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(Wherein n and m are, independently of each other,
0 to 16 (where 3 <n + m <29), and q and p are each independently 0 or 1).

Group E, ie, preferred compounds of the formula (V) are those in which the symbols of the formula (V) have the following meanings: X ³ is (a) —F or —CF ₃ ;
(B) 1 to 10 amino (with or without asymmetric carbon atoms) linear or branched alkyl group having carbon atoms, wherein, b1) 1 or 2 non-adjacent and non-terminal -CH ₂
The group may be replaced by -O-, -CO-O- or -O-CO- and / or b2) one or more hydrogen atoms of the alkyl group may be replaced by F Often, R ¹ is (a) a hydrogen atom, (b)
Linear or branched alkyl groups having 1 to 16 carbon atoms (with or without asymmetric carbon atoms), wherein b1) one or two non-adjacent and non-terminal -CH ₂
The group is -O-, -CO-O-, -O-CO- or-
Si (CH ₃ ) ₂ , and / or
Or b2) one or more hydrogen atoms of the alkyl group may be replaced by F, and / or b3) the terminal CH ₃ group is any one of the following chiral groups (optically active or racemic) May be replaced by:

[0104]

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Provided that when X ³ is —F or —CF ₃ , R ¹ is not H; R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ are
Independently of one another: a) a hydrogen atom, b) a straight-chain or branched alkyl group having 1 to 12 carbon atoms (with or without asymmetric carbon atoms);
Wherein b1) one non-terminal —CH ₂ — group may be replaced by —O— and / or c) R ⁴ and R ⁵ are oxirane, dioxolane, tetrahydrofuran, tetrahydropyran, butyrolactone or if you are bound to valerolactone system, together are - (CH _{2) 4} - or - (CH _{2) 5} -, which may be, a ^{and; M 1, M 2, M} 3 are, independently of one another, -CO-O -, - O -CO -, - CH 2 -O -, -
O-CH ₂ - or a single bond; A ^1, A ^2, A ^3, independently of one another, one or two H atoms may be replaced by F 1,4-phenylene, one Pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene, naphthalene-2,6-diyl, thiophen-
2,5-diyl, [1,3,4] -thiadiazole-
2,5-diyl, or [1,3] -thiazole-2,
5-diyl.

Examples of particularly preferred compounds of the formula (V) are:

[0107]

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(Wherein, R has the same meaning as R ^{1 in} formula (V)). More particularly preferred compounds are those wherein R ¹ and R ² are linear or branched alkyl groups having ^{1 to} 16 carbon atoms (with or without asymmetric carbon atoms).
By and wherein one or two -CH ₂ - groups -O
- or -Si (CH ₃₎ may be replaced by _2, however, the oxygen atoms must not be bonded directly to each other; one or more hydrogen atoms of the alkyl group may be substituted with F Good compounds of formula (V).

Preferred compounds of group F are those of the formula (V
Symbol I) is a compound having the following meanings: R ¹ and R ^2, independently of one another, (a) hydrogen atom, (b)
Linear or branched alkyl groups having 1 to 16 carbon atoms (with or without asymmetric carbon atoms), wherein b1) one or two non-adjacent and non-terminal -CH ₂
The group is -O-, -CO-O-, -O-CO- or-
Si (CH ₃ ) ₂ , and / or
Or, b2) 1 single -CH ₂ - group, trans-1,4-cyclohexylene may be replaced by 1,4-phenylene or cyclopropane-1,2-diyl, and / or, b3) One or more hydrogen atoms of the alkyl group may be replaced by F, and / or b4) the terminal CH ₃ group is replaced by any one of the following chiral groups (optically active or racemic): May be:

[0110]

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Provided that only one of R ¹ and R ² can be a hydrogen atom; R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ are
Independently of one another: a) a hydrogen atom, b) a straight-chain or branched alkyl group having 1 to 12 carbon atoms (with or without asymmetric carbon atoms);
Wherein b1) one non-terminal —CH ₂ — group may be replaced by —O— and / or c) R ⁴ and R ⁵ are oxirane, dioxolane, tetrahydrofuran, tetrahydropyran, butyrolactone or if you are bound to valerolactone system, together are - (CH _{2) 4} - or - (CH _{2) 5} -, which may be, a and; M ^1, M ² are, independently of one another And -C
O-O -, - O- CO -, - CH 2 -O -, - O-CH 2
-Or a single bond; A ¹ , A ² and A ³ independently of one another are 1,4-phenylene in which one or two H atoms may be substituted by F, and one H atom is F Pyridine-2,5-diyl, pyrimidine- which may be substituted
2,5-diyl, trans-1,4-cyclohexylene, naphthalene-2,6-diyl, thiophene-2,5
-Diyl, [1,3,4] -thiadiazole-2,5-
Diyl, or [1,3] -thiazol-2,5-diyl.

Examples of particularly preferred compounds of formula (VI) are:

[0113]

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(Wherein R and R ′ are the same as those of formula (VI)
¹ and R ² ). More particularly preferred compounds are those wherein R ¹ and R ² are straight or branched chain alkyl groups having ^{1 to} 16 carbon atoms (with or without asymmetric carbon atoms), wherein one or two One of the -CH ₂ - group is -O-, it may be replaced by cyclopropane-1,2-diyl or -Si (CH _{3) 2,} where oxygen atoms must not be bonded directly to one another A compound of formula (VI), wherein one or more hydrogen atoms of the alkyl group may be replaced by F and R ¹ or R ² may be hydrogen, but not both may be hydrogen at the same time.

Very particularly preferred compounds are the following compounds of the formula (VI):

[0116]

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(Wherein n and m are, independently of each other,
0-16, where 3 <n + m <29; q and p are, independently of one another, 0 or 1.

Preferred compounds of group G are those of the formula (VI)
I) are compounds wherein the symbol has the following meaning: R ¹ is
(A) a hydrogen atom, (b) a linear or branched alkyl group having 1 to 16 carbon atoms (with or without an asymmetric carbon atom), wherein b1) one or two non-adjacent and non-terminal -CH ₂ - group, -O-, -CO-O -, - O-CO- or -Si (CH ₃₎ may be replaced by _2, and / or, b2) 1 single -CH _{The 2} -group may be replaced by trans-1,4-cyclohexylene, 1,4-phenylene or cyclopropane-1,2-diyl and / or b3) one or more hydrogens of the alkyl group atoms may be replaced by F, and is / or b4) terminal CH ₃ group may be replaced by one of the following chiral groups (optically active or racemic):

[0119]

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R ² represents (a) a hydrogen atom, (b) 1 to
Linear or branched alkyl groups having 14 carbon atoms (with or without asymmetric carbon atoms), wherein b1) one or two non-adjacent and non-terminal -CH ₂
The group is -O-, -CO-O-, -O-CO- or-
Si (CH ₃ ) ₂ , and / or
Or b2) one or more hydrogen atoms of the alkyl group may be replaced by F: R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ are, independently of one another, a) a hydrogen atom, b A) straight-chain or branched alkyl groups having 1 to 12 carbon atoms (with or without asymmetric carbon atoms);
Wherein b1) one non-terminal —CH ₂ — group may be replaced by —O— and / or c) R ⁴ and R ⁵ are oxirane, dioxolane, tetrahydrofuran, tetrahydropyran, butyrolactone or if you are bound to valerolactone system, together are - (CH _{2) 4} - or - (CH _{2) 5} -, which may be, a and; M ^1, M ² are, independently of one another And -C
O-O -, - O- CO -, - CH 2 -O -, - O-CH 2
Or a single bond; A ¹ and A ² independently of one another
1,4-phenylene in which one or two H atoms may be substituted with F, pyridine-2,5-diyl, pyrimidine-2, in which one H atom may be substituted with F,
5-diyl, 1,4-cyclohexylene, naphthalene-
2,6-diyl, thiophene-2,5-diyl, [1,
3,4] -thiadiazole-2,5-diyl or [1,3] -thiazol-2,5-diyl.

Examples of particularly preferred compounds of the formula (VII) are:

[0122]

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Wherein R and R ′ have the same meaning as R ¹ and R ² in formula (VII). More particularly preferred compounds are those wherein R ¹ and R ² are straight or branched chain alkyl groups having ^{1 to} 16 carbon atoms (with or without asymmetric carbon atoms), wherein one or two One of the -CH ₂ - group is -O-, it may be replaced by cyclopropane-1,2-diyl or -Si (CH _{3) 2,} where oxygen atoms must not be bonded directly to one another One or more hydrogen atoms of the alkyl group may be replaced by F; R ¹ or R ² may be hydrogen,
Both are compounds of formula (VII), which must not be simultaneously hydrogen.

Very particularly preferred compounds are of the formula (VII)
Is the following compound of:

[0125]

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(Wherein n and m are, independently of each other,
0 to 16 (where 3 <n + m <29); p is 0
Or 1).

The compounds of Groups AG are known or
Alternatively, it can be produced by a known method similarly to a known compound.

The compounds and their synthesis are described, for example, in the following documents: EP-A 0 604 921 and EP-A 06
22 359 (component A): DE-A 195 00 768 (component B); US 5,389,291 and WO-A 92/11.
241 (component C); EP-A 0 332 024 and J.I. Chem. S
oc. Perkin Trans. II 1989, 2
041 (component D); EP-A 0 578 054 (component E); EP-A 0 309 514 and DE-A 37
03 651 (component F); and EP-A 0 233 267 (component G); all of which are incorporated herein by reference.

The liquid crystal mixtures according to the invention are produced in a manner customary per se. In general, the compounds dissolve in one another, preferably at high temperatures.

As described above, the ferroelectric liquid crystal mixture of the present invention comprises one or more compounds from Group A and one or more compounds from Groups BG.

The mixture preferably contains from 2 to 35, more preferably from 2 to 30, particularly preferably from 3 to 25, particularly preferably from 4 to 20, compounds of the groups AG.

The content of the compounds of Groups A to G in the mixture is preferably at least 5% by weight, more preferably at least 10% by weight, particularly preferably at least 15% by weight.

In a preferred embodiment, the mixtures according to the invention comprise compounds from two, three or four different groups BG.

In a preferred embodiment, the compounds of the invention comprise at least one compound from each of the following groups: a) A + B b) A + C c) A + D d) A + E e) A + F f) A + G.

In yet another preferred embodiment, the compounds of the invention comprise one or more compounds from group A, one or more compounds from group B, and groups C, D,
Includes one or more compounds from E, F or G.

In another preferred embodiment, the compounds of the invention comprise one or more compounds from group A, one or more compounds from group C, and groups B, D, E, F
Or one or more compounds from G.

In another preferred embodiment, the compounds of the invention comprise one or more compounds from group A, one or more compounds from group D, and groups B, C, E, F
Or one or more compounds from G.

In another preferred embodiment, the compounds of the invention comprise one or more compounds from group A, one or more compounds from group E, and groups B, C, D, F
Or one or more compounds from G.

In another preferred embodiment, the compounds of the invention comprise one or more compounds from group A, one or more compounds from group F, and groups B, C, D, E
Or one or more compounds from G.

In another preferred embodiment, the compounds of the invention comprise one or more compounds from group A, one or more compounds from group G, and groups B, C, D, E
Or one or more compounds from F.

In yet another preferred embodiment, the compounds of the invention comprise three or more compounds from each of the following groups: a) A + B + C b) A + B + D c) A + B + E d) A + B + F e) A + B + G f) A + C + D g) A + C + E h) A + C + F i) A + C + G j) A + D + E k) A + D + F l) A + D + G m) A + E + F n) A + E + Go o) A + F + G.

In a further preferred embodiment, the compounds of the invention comprise four or more compounds from each of the following groups: a) A + B + C + D b) A + B + C + E c) A + B + C + F d) A + B + C + Ge) A + B + D + E f) A + B + D + Fg) A + B + E + G i) A + B + F + G k) A + C + D + E l) A + C + D + F m) A + C + D + G n) A + C + E + F + A + C + E + F + G + A + F + G + F + G + A + F

The liquid crystal mixture of the present invention generally has a composition of 2 to 35.
Species, preferably from 2 to 30, particularly preferably from 3 to 25 compounds.

Since the liquid crystal mixture of the present invention is ferroelectric, it must contain at least one optically active compound. In general, the mixture comprises one or more optically inactive compounds (base mixture) and one or more optically active compounds (chiral dopants).

Further examples which are suitable for the liquid-crystal mixtures according to the invention are: WO 86/06401 and US Pat.
A phenylpyrimidine derivative as described in EP 542; a silicon compound as described in EP-A 0 355 008; a mesogenic compound having only one side chain as described in EP-A 0 541 081; Hydroquinone derivatives as described in A 0 603 786, -pyridylpyrimidines as described in WO 92/12974, -P. Keller, Ferroelectrics
58 (1984), 3 and J. Am. W, Goodby
Etc., Liquid Crystal and Orde
red Fluids, Vol. 4, New Yor
k, 1984, thiazoles as described in EP-A 0 430 170, fluorinated compounds as described in EP-A 0 132 377, in particular terphenyl,-EP-A 0 4- as described in 233 267
Cyano-cyclohexyl derivatives, 2- as described in EP-A 0 532 916
Fluoro-pyrazine, EP-A 0 546 338 and EP-A 0
Indane compounds as described in 647 695, naphthalene compounds as described in DE-A 42 40 041, and thiophene compounds as described in EP-A 0 400 072.

Examples of suitable chiral non-racemic dopants are as follows: Keller, Ferroelectrics
58 (1984), 3 and J. Am. W, Goodby
Etc., Liquid Crystal and Orde
red Fluids, Vol. 4, New Yor
k, 1984, optically active phenylbenzoates, EP-A 0 263 437 and WO-A 9
Optically active oxirane ethers as described in 3/13093, optically active oxirane esters as described in EP-A 0 292 954, optically active dioxolane ethers as described in EP-A 0 351 746, EP- Optically active dioxolane esters as described in A 0 361 272-optically active tetrahydrofuran-2-carboxylic acid esters as described in EP-A 0 355 561;-EP-A 0 237 007 and US 5,0
Optically active 2-fluoroalkyl ethers as described in 51,506, and optically active 4-cyano-cyclohexyl compounds as described in EP-A 0 428 720.

Preferred additional compounds are of formula (VIII):

[0148]

Embedded image

Wherein R ¹ and R ² are as defined in formula (I); rings A and B are, independently of one another,
1,4-phenylene or 1,4-cyclohexylene; q and p are 0, 1 or 2 with the proviso that 0
<Q + p ≦ 2; when q or p is 2, the A or B group may be different).

Examples of particularly preferred compounds of formula (VIII) are as follows:

[0151]

Embedded image

[0152]

Embedded image

(Wherein R ¹ and R ² are each independently an alkyl group having 0 to 16 carbon atoms;
Here, one or two hydrogen atoms of the alkyl group may be replaced by F; R ¹ or R ² may be hydrogen, but not both at the same time.

The liquid crystal mixture of the present invention preferably has a negative Δε. The absolute value is the operating range temperature of the display, preferably 10 to 40 ° C, particularly preferably 25 ° C.
And more preferably 2 or more, especially 4 or more.

[0155] Ferroelectric liquid crystal display liquid crystal mixture used element (with decreasing _{temperature) I-N * -S A -S} C * phase sequence of sufficiently broad N * phase and broad S _A phase , And N *
In Phase and S _C * phase sufficiently long helical pitch (FL
It is preferable that the thickness of the layer C is at least 5 times, more preferably 10 times, because good alignment characteristics can be obtained. (I isotropic phase, N * is a chiral nematic phase, S _A a smectic A phase, and S _C * represents a chiral smectic C phase.) In particular, smectic A phase and nematic phase, there two phases simultaneously Without doing so, it should have a temperature range of at least 1 ° C, preferably 3 ° C or higher, more preferably 5 ° C or higher.

According to the present invention, by using the compounds of groups A to G optionally together with the compound of the general formula (VIII), it is possible to increase the absolute value of the negative Δε of the ferroelectric liquid crystal. In the conventional method, the spontaneous polarization value of the liquid crystal is selected to be sufficiently low in order to lower the driving voltage. However, the present invention makes it possible to improve the response speed by increasing the spontaneous polarization value without increasing the driving voltage. In the present invention, the spontaneous polarization value is preferably 1 to 30 nC / cm ² , particularly preferably 5 to 20 nC / cm ² .

As the spontaneous polarization value increases, it is sometimes observed that sufficient contrast is not obtained due to sticking or insufficient memory properties. Therefore, the ferroelectric liquid crystal mixture of the present invention is disclosed in EP-A 0 502 9
64, EP-A 0 385688 or WO-A 9
It preferably contains at least one compound as described in 3/04142. These documents are hereby incorporated by reference. Examples of these compounds are, inter alia, ethylene glycol dimethyl ether and triethylene glycol dimethyl ether, and crown ethers (eg 12-crown-4,
15-crown-5, 18-crown-6, etc.) and their derivatives.

The liquid crystal mixture of the present invention preferably contains 0.01 to 5% by weight, especially 0.1 to 2% by weight of the above compound.

The pretilt angle of the liquid crystal molecules at the interface between the liquid crystal and the alignment film is preferably 10 ° or less, more preferably 0.1 to 8 °.

In a preferred embodiment, the Θ of the mixture of the present invention
_(5V) / Θ _(0V) ratio is 1.4 or more, preferably 1.8 or more,
Particularly preferably, it is 2.0 or more.

Suitable further components known to those skilled in the art, for example, Y. Aoki and H.M. Nohira, Ferro
electrics 1996, 178, 213-22
By adding the dopant described in No. 0, a mixture exhibiting antiferroelectricity can be obtained.

The mixtures according to the invention can be used for electro-optical or completely optical elements, such as display elements, switching elements,
It can be used in the area of light modulators, image processing and / or signal processing elements, or generally nonlinear optical elements.

The ferroelectric liquid crystal mixtures according to the invention are particularly suitable for use in electro-optical switching and display elements (displays). Usually, these displays have a liquid crystal layer, usually starting from an LC layer, with at least one
It is configured to be surrounded on both sides by layers in the order of one alignment film, an electrode and a limiting sheet (eg, a sheet of glass). In addition, they include spacers, adhesive frames, polarizers and, in the case of color displays, a thin color filter layer. Other possible components include an anti-reflective layer,
A passivation layer, a reinforcement layer and a barrier layer, and an electric nonlinear element,
For example, a thin film transistor (TFT) and a metal-insulator-metal (MIM) element. The structure of a liquid crystal display is described in a related paper (for example, E. Kaneko, “Liqu
id Crystal TV Displays: Pr
inciples and Applications
of Liquid Crystal Displa
ys ”, KTK Scientific Publics
hers 1987).

These are particularly useful for use in reverse mode or τ-V _(min) mode. The present invention further provides a ferroelectric liquid crystal (F) comprising the above liquid crystal mixture of the present invention between a pair of substrates including an electrode and an alignment film formed thereon.
LC) providing a display element.

In a preferred embodiment, the FLC display operates in reverse mode. Several publications are cited herein, for example, to discuss the state of the art, the synthesis of the compounds used in the present invention, or the application of the mixtures of the present invention. All of these documents are hereby incorporated by reference. Preparation of Cell A solution of LQT120 (Hitachi Chemical Co., Ltd.) is applied on a glass substrate having ITO by spin coating at 2500 rpm. The substrate is heated at 200 ° C. for 1 hour to form a film. After rubbing the coating film in one direction with a nylon cloth,
Assemble the substrates by inserting a 2.0 μm thick spacer between the substrates so that the rubbing directions are parallel to each other,
Create a cell. The properties of the liquid crystal mixture are measured using the cell obtained. Strong pulse width (tau) is the minimum value in the tau-V characteristic of the ferroelectric liquid crystal device (tau _min) to become voltage (V _min)
Is measured by injecting the liquid crystal mixture into the cell in an isotropic phase, gradually cooling to nematic, smectic A and smectic C phases, and applying a unipolar pulse to the cell at 25 ° C.

The phase transition temperature is determined by optical polarization microscopy and DT
Measured by A. The dielectric anisotropy (△ ε) was determined by injecting the liquid crystal mixture into homeotropic and planar alignment cells (EHC, cell thickness 10 μm), 1 V, 20 KH
It is measured by applying an electric field of z to the cell at 25 ° C. The value of the homeotropic alignment is corrected for the tilt angle. Spontaneous polarization Ps diamant bridge (or Sawver-Towe
r) Method (H, Diamant, K, Prenk an)
dR. Pepinsky, Rev. Sci. Inst
r. Using 28, 30 (1957)), to measure the P _s. The test cell is 5 μm thick and is thinly coated with ITO.

2Θ _{(5 V)} was measured by optical inspection in two memory states while applying a high-frequency rectangular pulse. The voltage of the rectangular pulse from peak to peak is 10V.

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 598036735 D-65926 Frankfurt am Main, Germany (72) Inventor Javier Manero Germany 65658 Liederbach, Platanenweg 26 (72) Inventor Barbara Hornunk Germany Federal Republic 63594 Haselroth, Surstrasse 21

Claims (10)

[Claims] 1. Compounds of the following group A and furthermore
Or a compound of any one of groups BG of
Non-racemic tilted smectic liquid crystal mixture: 2,6-Disubstituted quinoxaline derivatives of formula (I):[Wherein, R¹And R^TwoAre independently of each other: (a) a hydrogen atom, -F, -Cl, -CN, -CF_ThreeMa
Or -OCF_Three(B) straight or branched having 1 to 20 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B) one or more non-adjacent and non-terminal -CH_Two-Group
Is -O-, -S-, -CO-, -CO-O-, -O-
CO-, -O-CO-O- or -Si (CH_Three)_TwoPut in
And / or b2) one or more -CH_Two-Group is -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-fe
Nylene, cyclopropane-1,2-diyl or 1,3
-May be replaced by cyclopentylene; and
And / or b3) one or more hydrogen atoms of the alkyl group is F and
And / or b4) terminal CH_ThreeThe group is the next chiral group (optically active or
Or racemic)
Well:Embedded imageWhere R¹, R^TwoOnly one of them is a hydrogen atom, -F,
-Cl, -CN, -CF _ThreeOr -OCF_ThreeThat it is
Can; R^Three, R^Four, R^Five, R⁶, R⁷Are, independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
Y;¹, Y^TwoAnd Y^ThreeAre independent of each other
And is —CF— or —CH—;¹, M^Two,
M^Three, M^FourAre, independently of one another, -CO-O-, -OC
O-, -CH _Two-O-, -O-CH_Two-, -CH_Two-CH_Two
-, -CH = CH-, -C≡C-, -CH_Two-CH_Two-C
O-O-, -O-CO-CH_Two-CH_Two-Or with a single bond
Yes; A¹, A^Two, A^Three, A^FourAre independent of one another
The above H atom is replaced by F, Cl and / or CN
1,4-phenylene, one H atom being replaced by F
Optionally substituted pyridine-2,5-diyl, pyrimi
Gin-2,5-diyl, one H atom being replaced by F
Optionally pyrazine-2,5-diyl, one H atom is
Pyridazine-3,6-dii which may be substituted by F
And one or two hydrogen atoms are CN and / or F
And / or CH_Three1,4- which may be substituted
Cyclohexylene, wherein one or more H atoms is F, Cl and
And / or naphthalene-2, optionally substituted with CN,
6-diyl, one or two H atoms being replaced by F
Thiophene-2,5-diyl, [1,3,
4] -thiadiazole-2,5-diyl, one H atom
Is optionally substituted with F [1,3] -thiazole-
2,4-diyl, even if one H atom is substituted by F
Good [1,3] -thiazol-2,5-diyl, or
1,3-dioxane-2,5-diyl; a, b,
c and d are 0 or 1, provided that the compound of the formula (I)
Must not contain more than four 5- or 6-membered ring systems
B]. Phenanthrene derivative of formula (II):[Where E¹, E^Two, E^Three, E^Four, E^FiveAnd E⁶Is -N
-, -CF- or -CH-, provided that E
¹(E^Four) Is -N- or -CF-, then E^TwoAnd
And E^Three(E^FiveAnd E⁶) Must be -CH-;
E^TwoAnd / or E^Three(E^FiveAnd / or E⁶) Is -C
If F-, then E¹(E^Four) Must be -CH-
E;^Two(E^Five) Is -N-, then E¹(E^Four) Is -C
Must be H-, while E^Three(E⁶) Is -CH-
Or -CF-; and E¹~ E⁶Few
At least one must be -N- or -CF-;
G is -CH_TwoCH_Two-Or -CH = CH-; R¹
And R^TwoAre independently of each other: (a) a hydrogen atom, -F, -Cl, -CN, -CF_ThreeMa
Or -OCF_Three(B) straight or branched having 1 to 20 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B) one or more non-adjacent and non-terminal -CH_Two-Group
Is -O-, -S-, -CO-, -CO-O-, -O-
CO-, -O-CO-O- or -Si (CH_Three)_TwoIn
And / or b2) one or more -CH_Two-Group is -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-fe
Nylene, cyclopropane-1,2-diyl or 1,3
-May be replaced by cyclopentylene; and
And / or b3) one or more hydrogen atoms of the alkyl group is F and
And / or b4) terminal CH_ThreeThe group is the next chiral group (optically active or
Or racemic)
Well:Embedded imageWhere R¹, R^TwoOnly one of them is a hydrogen atom, -F,
-Cl, -CN, -CF _ThreeOr -OCF_ThreeThat it is
Can; R^Three, R^Four, R^Five, R⁶, R⁷Are, independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
May be; M¹, M^TwoAre, independently of one another, -C
O-O-, -O-CO-, -CH_Two-O-, -O-CH_Two
-, -CH_Two-CH_Two-, -CH = CH-, -C≡C-,
-CH_Two-CH_Two-CO-O-, -O-CO-CH_Two-C
H_TwoA or a single bond;¹, A^TwoAre independent of each other
Wherein one or more H atoms is F, Cl and / or CN
Optionally substituted 1,4-phenylene, one H atom
Pyridine-2,5-dii, which may be substituted with F
, Pyrimidine-2,5-diyl, one H atom is F
Optionally substituted pyrazine-2,5-diyl, one
Pyridazine-3, wherein the H atom of may be substituted with F,
6-diyl, one or two hydrogen atoms are CN and / or
Or F and / or CH_ThreeMay be replaced by
1,4-cyclohexylene, thiophene-2,5-dii
[1,3,4] -thiadiazole-2,5-diyl
[1,3] -thiazole-2,4-diyl, [1,1
3] -thiazol-2,5-diyl or 1,3-di
Oxane-2,5-diyl; a and b are 0 or 1
With the proviso that the compound of formula (II) has four or more
Or a 6-membered ring system]; 2-fluoropyridine derivative of formula (III):[Wherein, R¹And R^TwoAre independently of each other: (a) a hydrogen atom, -F, -Cl, -CN, -CF_ThreeMa
Or -OCF_Three(B) straight or branched having 1 to 20 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B) one or more non-adjacent and non-terminal -CH_Two-Group
Is -O-, -S-, -CO-, -CO-O-, -O-
CO-, -O-CO-O- or -Si (CH_Three)_TwoIn
And / or b2) one or more -CH_Two-Group is -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-fe
Nylene, cyclopropane-1,2-diyl or 1,3
-May be replaced by cyclopentylene; and
And / or b3) one or more hydrogen atoms of the alkyl group is F and
And / or b4) terminal CH_ThreeThe group is the next chiral group (optically active or
Or racemic)
Well:Embedded imageWhere R¹, R^TwoOnly one of them is a hydrogen atom, -F,
-Cl, -CN, -CF _ThreeOr -OCF_ThreeThat it is
Yes; R^Three, R^Four, R^Five, R⁶, R⁷Are, independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
May be; M¹, M^Two, M^Three, M^FourAre independent of each other
To form -CO-O-, -O-CO-, -CH _Two-O-,
-O-CH_Two-, -CH_Two-CH_Two-, -CH = CH-,
-C≡C-, -CH_Two-CH_Two-CO-O-, -O-CO
-CH_Two-CH_TwoA or a single bond;¹, A^Two,
A^Three, A^FourIs, independently of one another, one or more H atoms is F,
1,4 optionally substituted with Cl and / or CN
Phenylene, one H atom of which may be replaced by F
Pyridine-2,5-diyl, pyrimidine-2,5-di
Yl, a pyrazine in which one H atom may be replaced by F
2,2,5-diyl, wherein one H atom is replaced by F
Pyridazine-3,6-diyl, one or two
Has a hydrogen atom of CN and / or F and / or CH
_Three1,4-cyclohexylene optionally substituted with
Replacing one or more H atoms with F, Cl and / or CN
Naphthalene-2,6-diyl, thiof
-2,5-diyl, [1,3,4] -thiadiazo
Ru-2,5-diyl, [1,3] -thiazole-2,4
-Diyl, [1,3] -thiazole-2,5-diyl,
Or 1,3-dioxane-2,5-diyl;
a, b, c, and d are 0 or 1, provided that the formula (II)
The compounds of I) contain more than four 5- or 6-membered ring systems.
Must not]; Phenylene derivative of formula (IV):[Wherein, R¹And R^TwoAre independently of each other: (a) a hydrogen atom, -F, -Cl, -CN, -CF_ThreeMa
Or -OCF_Three(B) straight or branched having 1 to 20 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B) one or more non-adjacent and non-terminal -CH_Two-Group
Is -O-, -S-, -CO-, -CO-O-, -O-
CO-, -O-CO-O- or -Si (CH_Three)_TwoIn
And / or b2) one or more -CH_Two-Group is -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-fe
Nylene, cyclopropane-1,2-diyl or 1,3
-May be replaced by cyclopentylene; and
And / or b3) one or more hydrogen atoms of the alkyl group is F and
And / or b4) terminal CH_ThreeThe group is the next chiral group (optically active or
Or racemic)
Well:Embedded imageWhere R¹, R^TwoOnly one of them is a hydrogen atom, -F,
-Cl, -CN, -CF _ThreeOr -OCF_ThreeThat it is
Can; R^Three, R^Four, R^Five, R⁶, R⁷Are, independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
X;¹And X^TwoAre independent of each other,
Hydrogen, F, Cl, CF_ThreeOr CN, where X¹
And X^TwoIs not simultaneously hydrogen; M¹, M^Two, M^Three, M^Four
Are, independently of one another, -CO-O-, -O-CO-,-
CH _Two-O-, -O-CH_Two-, -CH_Two-CH_Two-, -C
H = CH-, -C≡C-, -CH_Two-CH_Two-CO-O
-, -O-CO-CH_Two-CH_Two-Or a single bond;
A¹, A^Two, A^Three, A^FourAre, independently of one another, one or more H
Even if the atom is replaced by F, Cl and / or CN
Good 1,4-phenylene, one H atom being replaced by F
Pyridine-2,5-diyl, pyrimidine-
2,5-diyl, even if one H atom is substituted by F
Good pyrazine-2,5-diyl, one H atom replaced by F
Optionally substituted pyridazine-3,6-diyl, one
Or two hydrogen atoms are CN and / or F and / or
Or CH_Three1,4-cyclohe optionally substituted by
Xylene, wherein one or more H atoms is F, Cl and / or
Naphthalene-2,6-dii which may be substituted by CN
1,2,3,4-tetrahydronaphthalene-2,6
-Diyl, thiophene-2,5-diyl, [1,3
4] -Thiadiazole-2,5-diyl, [1,3]-
Thiazole-2,4-diyl, [1,3] -thiazole
-2,5-diyl or 1,3-dioxane-2,5
A, b, c, d is 0 or 1;
Provided that the compound of the formula (IV) has 5 or more 5 or 6 members
Ring systems must not be included]; Meta of formula (V)
-Substituted aromatic compound:[Where X^ThreeIs (a) -F, -Cl, -Br, -CN, -CF_ThreeAlso
Is -OCF_Three(B) straight or branched having 1 to 12 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B1) where one or two non-adjacent and non-terminal -CH_Two
-Groups are -O-, -S-, -CO-, -CO-O- or
May be replaced by -O-CO-, and / or
Or b2) one or more hydrogen atoms of the alkyl group is F and
And / or may be substituted with Cl and / or CN
K; R¹Are: (a) hydrogen atom, -F, -Cl, -CN, -CF_ThreeMa
Or -OCF_Three(B) straight or branched having 1 to 20 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B) one or more non-adjacent and non-terminal -CH_Two-Group
Is -O-, -S-, -CO-, -CO-O-, -O-
CO-, -O-CO-O- or -Si (CH_Three)_TwoIn
And / or b2) one or more -CH_Two-Group is -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-fe
Nylene, cyclopropane-1,2-diyl or 1,3
-May be replaced by cyclopentylene; and
And / or b3) one or more hydrogen atoms of the alkyl group is F and
And / or b4) terminal CH_ThreeThe group is the next chiral group (optically active or
Or racemic)
Well:Embedded imageWhere X^ThreeIs -F, -Cl, -Br, -CN, -CF_Three
Or -OCF_Three, Then R¹Is a hydrogen atom, -F,
-Cl, -CN, -CF_ThreeOr -OCF_ThreeIs not
Not; R^Three, R^Four, R^Five, R⁶, R⁷Are, independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
May be; M¹, M^Two, M^ThreeAre independent of each other
-CO-O-, -O-CO-, -CH_Two-O-,-
O-CH_Two-, -CH_Two-CH_Two-, -CH = CH-,-
C≡C-, -CH_Two-CH_Two-CO-O-, -O-CO-
CH_Two-CH_TwoA or a single bond;¹, A^Two, A
^ThreeIndependently represent one or more H atoms as F, Cl or
And / or 1,4-phenyl optionally substituted with CN
Nylene, a pyr optionally substituted with one H atom by F
Gin-2,5-diyl, pyrimidine-2,5-diyl,
Pyrazine wherein one H atom may be substituted by F
2,5-diyl, even if one H atom is substituted by F
Good pyridazine-3,6-diyl, one or two waters
Elementary atoms are CN and / or F and / or CH_Threeso
1,4-cyclohexylene which may be substituted, one
The above H atoms are replaced by F, Cl and / or CN
Naphthalene-2,6-diyl, thiophene
-2,5-diyl, [1,3,4] -thiadiazole-
2,5-diyl, [1,3] -thiazole-2,4-di
Yl, [1,3] -thiazol-2,5-diyl, also
Is 1,3-dioxane-2,5-diyl; a,
b and c are 0 or 1, provided that the compound of the formula (V)
Must not contain more than four 5- or 6-membered ring systems
I]; (1,3,4) -thiadiazole of formula (VI):[Wherein, R¹And R^TwoAre independently of each other: (a) a hydrogen atom, -F, -Cl, -CN, -CF_ThreeMa
Or -OCF_Three(B) straight or branched having 1 to 20 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B) one or more non-adjacent and non-terminal -CH_Two-Group
Is -O-, -S-, -CO-, -CO-O-, -O-
CO-, -O-CO-O- or -Si (CH_Three)_TwoIn
And / or b2) one or more -CH_Two-Group is -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-fe
Nylene, cyclopropane-1,2-diyl or 1,3
-May be replaced by cyclopentylene; and
And / or b3) one or more hydrogen atoms of the alkyl group is F and
And / or b4) terminal CH_ThreeThe group is the next chiral group (optically active or
Or racemic)
Well:Embedded imageWhere R¹, R^TwoOnly one of them is a hydrogen atom, -F,
-Cl, -CN, -CF _ThreeOr -OCF_ThreeThat it is
Can; R^Three, R^Four, R^Five, R⁶, R⁷Are, independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
C) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
X;¹, X^Two, X^ThreeAre independent of each other
M, -CF-, -N- or -CH-;¹, M^Two
Are, independently of one another, -CO-O-, -O-CO-,-
CH_Two-O-, -O-CH_Two-, -CH_Two-CH_Two-, -C
H = CH-, -C≡C-, -CH_Two-CH_Two-CO-O
-, -O-CO-CH_Two-CH_Two-Or a single bond;
A¹, A^Two, A^ThreeIs independently one or more H atoms
May be substituted with F, Cl and / or CN
1,4-phenylene, wherein one H atom is substituted by F
Pyridine-2,5-diyl, pyrimidine-2,
5-diyl, one H atom optionally substituted by F
Pyrazine-2,5-diyl, one H atom being replaced by F
Optionally pyridazine-3,6-diyl, one or more
Means that two hydrogen atoms are CN and / or F and / or
Is CH_Three1,4-cyclohexyl optionally substituted with
Ren, where one or more H atoms is F, Cl and / or CN
Naphthalene-2,6-diyl which may be substituted with
Thiophene-2,5-diyl, [1,3,4] -thiazi
Azole-2,5-diyl, [1,3] -thiazole-
2,4-diyl, [1,3] -thiazole-2,5-di
Or 1,3-dioxane-2,5-diyl
A, b, c are 0 or 1, provided that the formula (V
The compounds of I) contain more than four 5- or 6-membered ring systems.
G. 4-cyanocyclohexyl of formula (VII):[Wherein, R¹Are: (a) hydrogen atom, -F, -Cl, -CN, -CF_ThreeMa
Or -OCF_Three(B) straight or branched having 1 to 20 carbon atoms
Chain alkyl groups (with or without asymmetric carbon atoms)
B) one or more non-adjacent and non-terminal -CH_Two-Group
Is -O-, -S-, -CO-, -CO-O-, -O-
CO-, -O-CO-O- or -Si (CH_Three)_TwoIn
And / or b2) one or more -CH_Two-Group is -CH = CH-,
-C≡C-, 1,4-cyclohexylene, 1,4-fe
Nylene, cyclopropane-1,2-diyl or 1,3
-May be replaced by cyclopentylene; and
And / or b3) one or more hydrogen atoms of the alkyl group is F and
And / or b4) terminal CH_ThreeThe group is the next chiral group (optically active or
Or racemic)
Well:Embedded imageR^TwoIs (a) a straight chain having 1 to 16 carbon atoms.
Or branched-chain alkyl groups (with or without asymmetric carbon atoms)
A1) wherein a1) one or two non-adjacent and non-terminal -CH_Two
-Groups are -O-, -S-, -CO-, -CO-O-,-
O-CO- or -Si (CH_Three)_TwoReplaced by-
And / or a2) one or two -CH_TwoThe group is -CH = C
H-, -C≡C-, and
And / or a3) one or more hydrogen atoms of the alkyl group are F and
// Cl and / or CN and / or CF_Three
R may be substituted with^Three, R^Four, R^Five, R⁶, R
⁷Are, independently of one another, a) a hydrogen atom, b) a straight or branched chain having 1 to 16 carbon atoms
Alkyl groups (with or without asymmetric carbon atoms),
Wherein b1) one or more non-adjacent and non-terminal -CH_Two-Group is
-O- and / or b2) one or two -CH_Two-Group is -CH = CH
And / or b3) one or more hydrogen atoms of the alkyl group is F or
Cl) may be substituted with Cl; c) R^FourAnd R^FiveMeans oxirane, dioxolane, te
Trahydrofuran, tetrahydropyran, butyrolact
If it is bound to a valerolactone or valerolactone system,
-(CH_Two)_Four-Or-(CH_Two)_Five-
May be; M¹, M^TwoAre, independently of one another, -C
O-O-, -O-CO-, -CH_Two-O-, -O-CH_Two
-, -CH_Two-CH_Two-, -CH = CH-, -C≡C-,
-CH_Two-CH_Two-CO-O-, -O-CO-CH_Two-C
H_TwoA or a single bond;¹, A^TwoAre independent of each other
Wherein one or more H atoms is F, Cl and / or CN
Optionally substituted 1,4-phenylene, one H atom
Pyridine-2,5-dii, which may be substituted with F
, Pyrimidine-2,5-diyl, one H atom is F
Optionally substituted pyrazine-2,5-diyl, one
Pyridazine-3, wherein the H atom of may be substituted with F,
6-diyl, one or two hydrogen atoms are CN and / or
Or F and / or CH_ThreeMay be replaced by
1,4-cyclohexylene, one or more H atoms are F, C
naphthale optionally substituted by 1 and / or CN
-2,6-diyl, thiophene-2,5-diyl,
[1,3,4] -thiadiazole-2,5-diyl,
[1,3] -thiazol-2,4-diyl, [1,3]
-Thiazole-2,5-diyl or 1,3-diox
A-2,5-diyl; a, b is 0 or 1
With the proviso that the compound of formula (VII) has more than 5
Must not contain a six-membered ring system]. 2. The mixture according to claim 1, comprising 2 to 35 compounds of groups AG. 3. The mixture according to claim 1, comprising at least 5% by weight of compounds of groups AG. 4. Each of the following groups: a) A + B b) A + C c) A + D d) A + E e) A + F f) comprising a combination of compounds selected from A + G.
3. The mixture according to any one of 3. 5. Each of the following groups: a) A + B + C b) A + B + D c) A + B + E d) A + B + F e) A + B + G f) A + C + D g) A + C + E h) A + C + F + A + F + A + F + A + F + A + F A) A + E + G. O) A + F + G.
4. The mixture according to any one of 4. 6. The squid placing each group: a) A + B + C + D b) A + B + C + E c) A + B + C + F d) A + B + C + G e) A + B + D + E f) A + B + D + F g) A + B + D + G h) A + B + E + F i) A + B + E + G j) A + B + F + G k) A + C + D + E l) A + C + D + F m) A + C + D + G n A) A + C + E + F p) A + C + F + G q) A + D + E + F r) A + D + E + G s) A + D + F + G t) A + E + F + G
5. The mixture according to any one of 5. 7. Use of the mixture according to claim 1 in a ferroelectric liquid crystal display device. 8. The use according to claim 7, wherein the ferroelectric liquid crystal display element is operated in a τV _min mode. 9. A ferroelectric liquid crystal display device comprising the mixture according to claim 1. Description: 10. The device according to claim 9, wherein the device is operated in a τV _min mode.