CN111018896B - Containing penta-coordinated Zn 2+ Ionic Zn (II) -ethylenediamine complex and preparation method thereof - Google Patents
Containing penta-coordinated Zn 2+ Ionic Zn (II) -ethylenediamine complex and preparation method thereof Download PDFInfo
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- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims description 7
- 238000010668 complexation reaction Methods 0.000 title description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims abstract description 15
- 150000002500 ions Chemical class 0.000 claims abstract description 12
- 239000002262 Schiff base Substances 0.000 claims abstract description 8
- 150000004753 Schiff bases Chemical class 0.000 claims abstract description 8
- 239000003446 ligand Substances 0.000 claims abstract description 8
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 4
- 125000004430 oxygen atom Chemical group O* 0.000 claims abstract description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 48
- SMQUZDBALVYZAC-UHFFFAOYSA-N salicylaldehyde Chemical compound OC1=CC=CC=C1C=O SMQUZDBALVYZAC-UHFFFAOYSA-N 0.000 claims description 22
- VNDYJBBGRKZCSX-UHFFFAOYSA-L zinc bromide Chemical compound Br[Zn]Br VNDYJBBGRKZCSX-UHFFFAOYSA-L 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 18
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 15
- 239000011701 zinc Substances 0.000 claims description 13
- 239000013078 crystal Substances 0.000 claims description 12
- 229940102001 zinc bromide Drugs 0.000 claims description 11
- IZALUMVGBVKPJD-UHFFFAOYSA-N benzene-1,3-dicarbaldehyde Chemical compound O=CC1=CC=CC(C=O)=C1 IZALUMVGBVKPJD-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 claims description 2
- 230000008025 crystallization Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000002189 fluorescence spectrum Methods 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 230000005284 excitation Effects 0.000 description 7
- 230000007704 transition Effects 0.000 description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000002447 crystallographic data Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000012921 fluorescence analysis Methods 0.000 description 1
- 238000001506 fluorescence spectroscopy Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F3/00—Compounds containing elements of Groups 2 or 12 of the Periodic Table
- C07F3/06—Zinc compounds
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B2200/00—Indexing scheme relating to specific properties of organic compounds
- C07B2200/13—Crystalline forms, e.g. polymorphs
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1003—Carbocyclic compounds
- C09K2211/1007—Non-condensed systems
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Abstract
The invention discloses a Zn containing penta-coordination 2+ The technical scheme is that the molecular formula of the ionic Zn (II) -ethylenediamine complex is as follows: c 9 H 11 N 2 ObrZn, the complex belongs to monoclinic system, the space group is P21/m, the unit cell parameters are respectively:
α＝90.00°,β＝93.231(4)°,γ＝90.00°,Z＝4,
the ethylenediamine molecule in the complex only forms a single Schiff base ligand, the complex is of a binuclear structure, and the center Zn 2+ The coordination environment of the ions is a penta-coordinate tetragonal pyramid geometric configuration, zn 2+ The ions are respectively bonded with two O atoms, two N atoms and Br from Schiff base ligand ‑ And (4) ion coordination. The equipment required in the reaction is simple, the operation is simple, convenient and feasible, the reaction can be reproduced, and the obtained complex has the advantages of fluorescence, high yield, convenience in carrying and the like, and is expected to be widely applied to the aspect of fluorescent materials.
Description
Technical Field
The invention belongs to the field of metal-organic complexes, and particularly relates to a zinc complex containing penta-coordination Zn 2+ Ionic Zn (II) -ethylenediamine composition and its preparation process.
Background
Fluorescent materials are materials which absorb energy and radiate in the form of electromagnetic waves of light in the process of transition back to a ground state after being excited by illumination, an external electric field or electron bombardment and the like, become support materials in the fields of information display, lighting sources, photoelectric devices and the like, and play an increasingly important role in social development and technical progress. Particularly, at present, the development of fluorescent materials with high conversion efficiency is one of the methods for solving the problem of energy shortage.
Although there is a certain research on metal-organic fluorescent crystal materials, the research system mainly uses an organic compound containing an aromatic ring or a conjugated structure as a system for constructing a framework, and no related research on a system constructed by a linear non-conjugated system is carried out.
Disclosure of Invention
In order to solve the problems and the defects of the prior art, the invention aims to provide a Zn containing penta-coordination 2+ Ionic Zn (II) -ethylenediamine composition and its preparation process.
In order to achieve the above object, a first aspect of the present invention is to provide a Zn alloy containing pentacoordinate Zn 2+ An ionic Zn (II) -ethylenediamine complex of the formula: c 9 H 11 N 2 ObrZn, the complex belongs to monoclinic system, the space group is P21/m, the unit cell parameters are respectively:
α＝90.00°,β＝93.231(4)°,γ＝90.00°,Z＝4,
the ethylenediamine molecule in the complex only forms a single Schiff base ligand, the complex is of a binuclear structure, and the center Zn 2+ The coordination environment of the ions is a penta-coordinate tetragonal pyramid geometric configuration, zn 2+ The ions are respectively bonded with two O atoms, two N atoms and Br from Schiff base ligand - And (4) ion coordination.
In addition, the invention also provides a zinc alloy containing penta-coordinate Zn 2+ A preparation method of ionic Zn (II) -ethylenediamine complex comprises the steps of dissolving ethylenediamine in anhydrous methanol, stirring, adding zinc bromide under the condition of continuously stirring at 50 ℃, enabling the solution to become white and turbid, continuing to stir, adding anhydrous methanol, then adding isophthalaldehyde, enabling the solution to be slightly yellow and clear, continuing to stir again, enabling the solution to be unchanged in color, dropwise adding a methanol solution with salicylaldehyde, enabling the solution to gradually become dark yellow and clear, enabling the pH of the solution to be 6.2-6.5, finally, allowing the solution to stand, adding dichloromethane with the same volume, filtering to obtain light yellow clarified liquid, standing in a dark grid, and crystallizing to obtain yellow long-strip rod-shaped crystals, wherein the weight ratio of the ethylenediamine, the zinc bromide, the isophthalaldehyde and the salicylaldehyde is 1.
Further setting, 1mmol of ethylenediamine, 0.5mmol of zinc bromide, 0.5mmol of m-phthalaldehyde and 1mmol of salicylaldehyde are respectively weighed, firstly, the ethylenediamine is dissolved in 10mL of anhydrous methanol, the mixture is slowly stirred for 5min, then, the zinc bromide is added at one time under the condition of continuous stirring at 50 ℃, the solution suddenly becomes white turbid, the stirring is continued for 5min, 10mL of anhydrous methanol is added, subsequently, the m-phthalaldehyde is added, the solution is yellowish clear, the stirring is continued for 5min, the solution color is unchanged, then, 6mL of methanol solution in which the salicylaldehyde is dissolved is dropwise added, the solution color gradually becomes dark yellow clear, the pH value of the solution is 6.2-6.5, finally, the solution is slightly stood, dichloromethane with the same volume is added, the solution is filtered to obtain light yellow clear liquid, the light yellow clear liquid is placed in a dark grid, and the yellow long-strip rod-shaped crystals are obtained by slow volatilization and crystallization.
The invention makes flexible ethylenediamine with symmetrical central structure react with zinc bromide, controls the pH value of the reaction system by using the methanol solution of salicylaldehyde to obtain Zn 2+ The ion is a penta-coordinated Zn (II) -ethylenediamine complex. Fluorescence spectrum test shows that when the complex is excited at 307nm, strong blue fluorescence is emitted at 442 nm; 3D-fluorescence spectroscopy tests show that strong blue fluorescence is emitted at 450nm when excited at 320 nm. The complex is expected to be applied as a blue light emitting material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a diagram of the structural unit of the complex;
FIG. 2 shows the structure of 1D-helix chain and 2D-supramolecule of the complex;
FIG. 3 is a solid state fluorescence spectrum of the complex.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Examples
Ethylenediamine (1mmol, 68.5. Mu.L), zinc bromide (0.5mmol, 115.3mg), m-phthalaldehyde (0.5mmol, 68.3mg), and salicylaldehyde (1mmol, 122.1mg) were weighed out, respectively. Firstly dissolving ethylenediamine in 10mL of anhydrous methanol, slowly stirring for 5min, then adding zinc bromide at one time under the condition of continuously stirring at 50 ℃, suddenly turning the solution to be white and turbid, continuously stirring for 5min, adding 10mL of anhydrous methanol, then adding m-phthalaldehyde, clarifying the solution in yellowish color, and continuously stirring for 5min, wherein the color of the solution is unchanged. Is connected withThen, 6mL of methanol solution with salicylaldehyde dissolved therein was added dropwise, and the solution gradually changed in color to a dark yellow clear solution, at which point the pH of the solution was about 6.2-6.5. Finally, the solution was allowed to stand slightly. An equal volume of dichloromethane was added and filtered to give a pale yellow clear solution. Standing in dark grid, slowly volatilizing to crystallize. After about one week, yellow long rod-like crystals were obtained. Theoretical value of elemental analysis (%): c,35.04; h,3.59; and N,9.08. Actual measurement values: c,35.08; h,3.55; and N,9.10. Characteristic infrared spectral value (KBr, cm) -1 )：3435m,3341m, 3268m,3155w,2925s,1648s,1596m,1546m,1470m,1446m,1403w,1284s,1198m, 1154m,1030m,885w,769s,601m。
Test examples: determination of Crystal data
(1) Placing a complex crystal which is proper in size and shape, transparent and free of cracks on a Bruker SMART APEXII CCD single crystal X-ray diffractometer, using MoK alpha rays (lambda = 0.071073 nm) monochromated by a graphite monochromator to search diffraction peaks by an XSCANS program under the conditions of high voltage of 50kV and dark current of 30mA, and accurately determining proper unit cell parameters. Diffraction data were collected in a W-2 θ scan, all data intensities were empirically absorption corrected by the SADABA program and data reduced by the Bruker SAINT program, and single crystal structure resolved by direct method using the SHELXTL program. All non-hydrogen atoms are subjected to Fourier synthesis and correction of a difference electron density function, and all hydrogen atom coordinates are obtained from the difference electron density function by combining geometric analysis. All non-hydrogen atom coordinates, anisotropic temperature factors and hydrogen atom coordinates and isotropic temperature factors are corrected to be convergent by a least square method. All weak effects calculations were performed by the PLATON program of the WinGX suite, and all molecular structure diagrams were drawn by the DIAMOND 3.1 software. The complex crystallographic data are respectively shown in Table 1.
TABLE 1 Crystal data for the complexes
a R 1 ＝Σ||F o |-|F c ||/Σ|F o |, b wR 2 ＝{Σ[w(F o 2 -F c 2 ) 2 ]/Σw(F o 2 ) 2 ]} 1/2 .
(2) Structure of the Complex
The partial bond lengths and angles, and hydrogen bond lengths and angles of the complexes are shown in tables 2 and 3, respectively. The crystal structure unit diagram and the 2D-supermolecule structure diagram of the complex are respectively shown in figure 1 and figure 2.
At room temperature of 293K, the complex belongs to a monoclinic system, the space group is P21/m, and the unit cell parameters are respectively as follows:
α＝90.00°,β＝93.231(4)°,γ＝ 90.00°,Z＝4,
(Table 2-2). The ethylenediamine molecule of the complex 6 only forms a single Schiff base ligand, the complex is of a binuclear structure, and the center Zn 2+ The coordination environment of the ions is a penta-coordinate tetragonal pyramid geometric configuration, zn 2+ The ions are respectively bonded with two O atoms, two N atoms and Br from Schiff base ligand - Ion coordination (fig. 1). Length of key
Zn1-O1,2.067 (3); zn1-O2,1.911 (4); zn2-O1,2.038 (4); zn2-O2,2.123 (4); zn1-N1,2.044 (7); zn1-N2,2.167 (7); zn2-N3,2.125 (5); zn2-N4, 2.151 (7); br1-Zn1,2.360 (1); br2-Zn2,2.435 (1); zn1-Zn2,2.856 (1). Key angle (°): N1-Zn1-N2,80.0 (3); N3-Zn2-N4,77.1 (2); O1-Zn1-N2,144.7 (3); O2-Zn2-N4, 129.9 (2); O2-Zn1-O1,78.5 (2); O1-Zn2-O2,74.5 (2) (Table 2).
TABLE 2 partial bond lengths and bond angles of the complexes
From these different data at corresponding positions, it is deduced that the molecular structure is asymmetric, directly affecting the moleculeFormation of inter-hydrogen bonds (table 3), such as Br1 (x, y, z) participates in the formation of two hydrogen bonds, while Br2 (x, y, z) participates in the formation of only one hydrogen bond. Along the b-axis, intermolecular hydrogen bonding N4-H4℃ Br2 (
q/° 3.437 (7), 129.5) are connected to form a one-dimensional S-helical chain; similarly, next to such an S-helix, there is also a hydrogen bond N4-H4 C.cndot.Br 2 (
q/° 3.437 (7), 129.5) are connected to each other to form a one-dimensional R-helical chain, and N2-H2B · Br1 (H-H) is hydrogen bonded between the two helical chains of different configurations
q/° 3.575 (8), 134.5) along the b-axis, joined to each other to form cyclically alternating R 2 2 (8) And R 4 2 (8) An eight-membered ring, thereby generating a racemic helical duplex. On the (1) plane, with such racemic double chains as units, N2-H2 C.cndot.. Br1 (
q/° 3.755 (7), 139.0) are connected to each other, forming a stable 2D-supramolecular network (fig. 2).
TABLE 3 Hydrogen bond Length and bond Angle of the complexes
Test example: optical Properties
(1) Fluorescence analysis
As can be seen from the solid-state fluorescence spectrum (FIG. 3) of the complex, the 1D-fluorescence spectrum of the complex shows that upon excitation at 307nm, blue fluorescence is emitted at 442 nm; the 3D-fluorescence spectrum of the complex shows blue fluorescence emission at 450nm upon excitation at 320 nm.
The 3D-fluorescence spectrum belongs to the whole-course (EX and EM) scanning, and provides possible excitation wavelengths and corresponding emission wavelengths, and the scanning report file comprises the 1D-fluorescence spectrum obtained by using the optimal excitation wavelength, so that the correctness of the 1D-fluorescence spectrum is further verified. The weak acting force among molecules (H-bonds, pi./one pair action and the like) effectively increases the rigidity of the compound, reduces the thermal vibration loss and the energy gap, reduces the required excitation energy and generates strong long-wave fluorescence; the larger the pi conjugated system in the molecule is, the more easily the delocalized pi electron is excited, the less excitation energy is required, and the more easily strong long-wave fluorescence is generated. The complexes have benzene rings and C = N double bonds, and N → pi possibly occurs in an ultraviolet-visible light region * And pi → pi * Transition, but n → π * Belonging to forbidden transitions, pi → pi * The absorption intensity (κ) of the latter is about 10 of that of the former, belonging to the permissible transition 2 ～10 3 Multiple, fluorescence excitation of the complex is due to pi → pi * Transition, fluorescent emission should fall under pi * The → pi transition. That is, the fluorescence emission mechanism of the complex is charge transfer within the complex (ILCT).
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (2)
1. Containing penta-coordinated Zn 2+ A process for the preparation of ionic Zn (II) -ethylenediamine complexes, characterized in that: dissolving ethylenediamine in anhydrous methanol, stirring, adding zinc bromide under continuous stirring at 50 deg.C to turn the solution into white turbid, stirring, adding anhydrous methanol, adding isophthalaldehyde to turn into yellowish clear solution, stirring, adding dropwise methanol solution containing salicylaldehyde to turn the solution into dark yellow clear solution with pH of 6.2-6.5, standing, adding equal volume of dichloromethane, filtering to obtain yellowish clear solution, standing in dark to crystallize to obtain yellow long stripRod-like crystals, said ethylenediamine, zinc bromide, isophthalaldehyde, and salicylaldehyde being 1;
the zinc containing penta-coordinate 2+ The molecular formula of the ionic Zn (II) -ethylenediamine complex is as follows: c 9 H 11 N 2 ObrZn belonging to the monoclinic system, space group ofP21/mThe cell parameters are respectively: a = 11.308 (2) a, b = 7.0389 (14) a, c = 13.426 (3) a, α = 90.00 a, β = 93.231 (4) degree, γ = 90.00 °, Z = 4, V = 1067.0 (4) a 3 The ethylenediamine molecule in the complex only forms a single Schiff base ligand, the complex is of a binuclear structure, and the center Zn 2+ The coordination environment of the ions is a penta-coordinate tetragonal pyramid geometric configuration, zn 2+ The ions are respectively bonded with two O atoms, two N atoms and Br from Schiff base ligand - And (4) ion coordination.
2. A penta-coordinated Zn-containing alloy according to claim 1 2+ A process for the preparation of ionic Zn (II) -ethylenediamine complexes, characterized in that: specifically, 1mmol of ethylenediamine, 0.5mmol of zinc bromide, 0.5mmol of m-phthalaldehyde and 1mmol of salicylaldehyde are respectively weighed, the ethylenediamine is firstly dissolved in 10mL of anhydrous methanol, the mixture is slowly stirred for 5min, then the zinc bromide is added at one time under the condition of continuous stirring at 50 ℃, the solution suddenly becomes white and turbid, the stirring is continued for 5min, 10mL of anhydrous methanol is added, subsequently, the m-phthalaldehyde is added, the solution is yellowish and clear, the stirring is continued for 5min, the solution color does not change, then, 6mL of methanol solution in which the salicylaldehyde is dissolved is dropwise added, the solution color gradually becomes dark yellow and clear, the pH value of the solution is 6.2-6.5, finally, the solution is slightly kept stand, dichloromethane with the same volume is added, the solution is filtered to obtain light yellow clear solution, the light yellow clear solution is placed in a dark grid, and slow volatilization and crystallization is carried out to obtain yellow long-strip rod-shaped crystals.
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| Title |
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| Influence of co-ligands in synthesis, photoluminescence behavior and catalytic activities of zinc complexes of 2-((E)-((pyridin-2-yl)methylimino)methyl)phenol;Priyanka Kundu et al.;《Polyhedron》;20140812;第85卷;第320-328页 * |
| Syntheses, Crystal Structures, and Fluorescence Properties of Zinc(II) Complexes with Multi-Dentate Schiff Bases;S. S. Qian等;《RUSSIAN JOURNAL OF COORDINATION CHEMISTRY》;20131231;第39卷(第12期);第836-843页 * |
| Synthesis, crystal structure and fluorescence properties of two dinuclear zinc(II) complexes incorporating tridentate (NNO) Schiff bases;SHYAMAPADA SHIT et al.;《Journal of Coordination Chemistry》;20160607;第20页图1、第9页4.结论部分及第4页配合物1的合成 * |
| 水杨醛缩胺类双席夫碱过渡金属配合物的合成与表征;李翠勤等;《化学与生物工程》;20111231;第28卷(第7期);第55-57页 * |
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