JPH0216752B2 - - Google Patents

Info

Publication number
JPH0216752B2
JPH0216752B2 JP26141384A JP26141384A JPH0216752B2 JP H0216752 B2 JPH0216752 B2 JP H0216752B2 JP 26141384 A JP26141384 A JP 26141384A JP 26141384 A JP26141384 A JP 26141384A JP H0216752 B2 JPH0216752 B2 JP H0216752B2
Authority
JP
Japan
Prior art keywords
liquid crystal
compound
formula
value
carbon atoms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP26141384A
Other languages
Japanese (ja)
Other versions
JPS61140579A (en
Inventor
Makoto Sasaki
Haruyoshi Takatsu
Yasuyuki Tanaka
Hisato Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DIC Corp
Original Assignee
Dainippon Ink and Chemicals Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dainippon Ink and Chemicals Co Ltd filed Critical Dainippon Ink and Chemicals Co Ltd
Priority to JP26141384A priority Critical patent/JPS61140579A/en
Priority to GB08501733A priority patent/GB2155465B/en
Publication of JPS61140579A publication Critical patent/JPS61140579A/en
Priority to US07/014,257 priority patent/US4705870A/en
Priority to US07/014,256 priority patent/US4820878A/en
Priority to US07/014,262 priority patent/US4705905A/en
Priority to US07/014,259 priority patent/US4713468A/en
Priority to GB08709632A priority patent/GB2189785B/en
Priority to US07/042,524 priority patent/US4726910A/en
Publication of JPH0216752B2 publication Critical patent/JPH0216752B2/ja
Granted legal-status Critical Current

Links

Description

【発明の詳細な説明】[Detailed description of the invention]

本発明は電気光学的表示材料として有用なトラ
ン誘導体の新規ネマチツク液晶化合物に関する。
本発明によつて提供される新規ネマチツク液晶化
合物は、 一般式 〔式中、Rは炭素原子数1〜9の直鎖状アルキル
基を表わし、R′は、ハロゲン原子あるいは炭素
原子数1〜9の直鎖状アルキル基を表わし、前記
ジオキサン環はトランス配置である。〕 で表わされる化合物である。 結晶表示セルの代表的なものにエム・シヤツト
(M・Sehadt)等〔APPLIED PHYSICS
LETTERS 18、127〜128(1971)によつて提案
された電界効果型セル(フイールド・エフエク
ト・モード・セル)又はジー・エイチ・ハイルマ
イヤー(G・H Heijmeier)等
〔PROCEEDING OF THE I.E.E.E56 1162〜
1171(1968)〕によつて提案された動的光散型セル
(ダイミツク・スキヤツタリング・モード・セル)
又はジー・エイチ・ハイルマイヤー(G・H
Heilmeier等〔APPLIED PHXSICS
LETTERS 13、91(1968)〕あるいはデイー・
エル・ホワイト(D L White)等
〔JOURNAL OF APPLIED PHYSICS 45
4718(1974)〕によつて提案されたゲスト・ホスト
型セルなどがある。 これらの液晶表示セルの中で現在主流をなすも
のは、電界効果型セルの一種のTN型セルであ
る。このTN型においては、G・Bauerによつて
Mol.Cryst.Lig Cryst.63 45(1981)に報告され
ているように、セル外観を損う原因となるセル表
面での干渉縞の発生を防止するために、セルに充
填される液晶材料の屈折率の異方性(△n)とセ
ルの厚さ(d)μmの積を或る特定の値に設定する必
要がある。実用的に使用される液晶表示セルで
は、△n・dの値が0.5、1.0、1.6又は2.2のいず
れかに設定されている。このように△n・dの値
が一定値に設定されるから、△nの値の大きな液
晶材料を使用すれば、dの値を小ならしめること
ができる。dの値が小となれば、応答時間(τ)
は、よく知られたταd2の関係式に従つて小とな
る。従つて、△nの値の大きな液晶材料は、応答
速度が速く、然も干渉縞のない液晶表示セルを製
作するのに極めて重要な材料である。一方、実用
可能な液晶材料の多くは、通常、室温付近にネマ
チツク相を有する化合物と室温より高い温度領域
にネマチツク相を有する化合物から成る数種又は
それ以上の成分を混合することによつて調製され
る。現在実用的に使用される上記の如き混合液晶
の多くは、少なくとも−30℃〜+65℃の全温度範
囲に亘つてネマチツク相を有することが要求され
ているが、液晶表示セルの応用製品の多様化に伴
ない、ネマチツク液晶温度範囲を更に高温側に拡
張した液晶材料が要望されており、このため、最
近では特にネマチツク相一等方性液体相(N−
I)転移温度の高いネマチツク液晶化合物が必要
とされている。 本発明に係る式()の化合物は、大きな△n
と高いN−I転移温度を有する新規なネマチツク
液晶化合物である。従つて、各種の母体液晶に式
()の化合物を混合することによつて、大きな
△nと高いN−I転移温度を有する実用的な混合
液晶材料を調製することができる。 本発明に係る式()の化合物は次の製造方法
に従つて製造することができる。 第1段階−2−n−アルキル−1,3−プロパン
ジオールとP−ヨードベンズアルデヒドとをト
ルエンの如き溶媒中に反応させることにより式
()の化合物を製造する。 第2段階−第1段階で製造された式()の化合
物を、N,N−ジメチルホルムアミドの如き溶
媒中で、ビス(トリフエニルフオスフイン)パ
ラジウム()クロライドの如き触媒を用い
て、4−n−アルキルフエニルアセチレンある
いは、4−ハロゲノフエニルアセチレンと反応
させて式()の化合物を製造する。 斯くして製造される式()の化合物の代表的
なものの転移温度を第1表に掲げる。
The present invention relates to novel nematic liquid crystal compounds of tolan derivatives useful as electro-optic display materials.
The novel nematic liquid crystal compound provided by the present invention has the general formula [In the formula, R represents a linear alkyl group having 1 to 9 carbon atoms, R' represents a halogen atom or a linear alkyl group having 1 to 9 carbon atoms, and the dioxane ring is in a trans configuration. be. ] It is a compound represented by Typical crystal display cells include M. Sehadt and others [APPLIED PHYSICS
LETTERS 18 , 127-128 (1971) or G.H. Heijmeier et al. [PROCEEDING OF THE IEEE56 1162-
1171 (1968)].
or G.H. Heilmeyer (G.H.
Heilmeier et al.〔APPLIED PHXSICS
LETTERS 13 , 91 (1968)] or D.
D L White et al. [JOURNAL OF APPLIED PHYSICS 45 ,
4718 (1974)]. The current mainstream among these liquid crystal display cells is a TN cell, which is a type of field effect cell. In this TN type, by G. Bauer,
As reported in Mol.Cryst.Lig Cryst. 63 45 (1981), the liquid crystal material filled in the cell is It is necessary to set the product of the refractive index anisotropy (Δn) and the cell thickness (d) μm to a certain value. In practically used liquid crystal display cells, the value of Δn·d is set to 0.5, 1.0, 1.6, or 2.2. Since the value of Δn·d is set to a constant value in this way, the value of d can be made small by using a liquid crystal material with a large value of Δn. If the value of d is small, the response time (τ)
is small according to the well-known relation ταd 2 . Therefore, a liquid crystal material with a large value of Δn is an extremely important material for producing a liquid crystal display cell that has a fast response speed and is free from interference fringes. On the other hand, most of the liquid crystal materials that can be used for practical purposes are usually prepared by mixing several or more components consisting of a compound that has a nematic phase near room temperature and a compound that has a nematic phase above room temperature. be done. Many of the above-mentioned mixed liquid crystals currently in practical use are required to have a nematic phase over the entire temperature range of -30°C to +65°C, but the variety of applied products for liquid crystal display cells is There is a demand for liquid crystal materials that extend the nematic liquid crystal temperature range to higher temperatures.
I) There is a need for nematic liquid crystal compounds with high transition temperatures. The compound of formula () according to the present invention has a large Δn
This is a new nematic liquid crystal compound with a high N-I transition temperature. Therefore, by mixing the compound of formula () with various parent liquid crystals, a practical mixed liquid crystal material having a large Δn and a high N-I transition temperature can be prepared. The compound of formula () according to the present invention can be produced according to the following production method. Step 1 - A compound of formula () is prepared by reacting 2-n-alkyl-1,3-propanediol and P-iodobenzaldehyde in a solvent such as toluene. Step 2 - The compound of formula () prepared in Step 1 is treated with 4- The compound of formula () is produced by reacting with n-alkylphenyl acetylene or 4-halogenophenyl acetylene. Table 1 lists the transition temperatures of representative compounds of formula () thus produced.

【表】 1 n−CH n−CH 83(C→N), 195(N〓I)
2 n−CH F 118(C→N), 178(N〓I)
3 n−CH13 n−CH 85(C→N), 176(N〓I)
4 n−CH13 F 113(C→N), 174(N〓I)
[Table] 1 n−C 3 H 7 n−C 4 H 9 83(C→N), 195(N〓I)
2 n−C 3 H 7 F 118(C→N), 178(N〓I)
3 n−C 6 H 13 n−C 4 H 9 85(C→N), 176(N〓I)
4 n−C 6 H 13 F 113(C→N), 174(N〓I)

Claims (1)

【特許請求の範囲】 1 一般式 〔式中、Rは炭素原子数1〜9の直鎖状アルキル
基を表わし、R′は、ハロゲン原子あるいは、炭
素原子数1〜9の直鎖状アルキル基を表わし、前
記ジオキサン環はトランス配置である。〕 で表わされる化合物。
[Claims] 1. General formula [In the formula, R represents a linear alkyl group having 1 to 9 carbon atoms, R' represents a halogen atom or a linear alkyl group having 1 to 9 carbon atoms, and the dioxane ring has a trans configuration. It is. ] A compound represented by
JP26141384A 1984-01-23 1984-12-11 Novel tolan-type nematic liquid crystal compound Granted JPS61140579A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP26141384A JPS61140579A (en) 1984-12-11 1984-12-11 Novel tolan-type nematic liquid crystal compound
GB08501733A GB2155465B (en) 1984-01-23 1985-01-23 Tolan-type nematic liquid crystalline compounds
US07/014,257 US4705870A (en) 1984-01-23 1987-02-11 Tolan-type nematic liquid crystalline compounds
US07/014,256 US4820878A (en) 1984-01-23 1987-02-11 Tolan-type nematic liquid crystalline compounds
US07/014,262 US4705905A (en) 1984-01-23 1987-02-11 Tolan-type nematic liquid crystalline compounds
US07/014,259 US4713468A (en) 1984-01-23 1987-02-11 Tolan-type nematic liquid crystalline compounds
GB08709632A GB2189785B (en) 1984-01-23 1987-04-24 Tolan-type nematic liquid crystalline compounds
US07/042,524 US4726910A (en) 1984-01-23 1987-04-27 Tolan-type nematic liquid crystalline compounds

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26141384A JPS61140579A (en) 1984-12-11 1984-12-11 Novel tolan-type nematic liquid crystal compound

Publications (2)

Publication Number Publication Date
JPS61140579A JPS61140579A (en) 1986-06-27
JPH0216752B2 true JPH0216752B2 (en) 1990-04-18

Family

ID=17361521

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26141384A Granted JPS61140579A (en) 1984-01-23 1984-12-11 Novel tolan-type nematic liquid crystal compound

Country Status (1)

Country Link
JP (1) JPS61140579A (en)

Also Published As

Publication number Publication date
JPS61140579A (en) 1986-06-27

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