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4-戊基(4′-丙基环己基)三联苯液晶的合成 总被引:1,自引:0,他引:1
在相转移催化剂十六烷基三甲基溴化铵的助催化作用下,用PdCl2催化芳基硼酸与溴代芳烃偶联反应合成了液晶化合物4-戊基(4′-丙基环己基)三联苯,反应转化率达到93%,反式产物选择性86%。结构经IR,^1H NMR和MS确证,并用DSC测定了此液晶的相变数据。考察了加料顺序和相转移催化剂对偶联反应的影响。提出了相转移条件下可能的催化循环机理,认为芳基硼酸是以ArB(OH)3^-离子形式参与偶联反应的。 相似文献
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CHEN YaFei LIN JieSheng YUAN WangZhang YU ZhenQiang LAM Jacky WingYip TANG BenZhong 《中国科学B辑》2013,(9):1204-1204
The luminescent liquid crystals (LLCs) are expected to solve the conflicts between the aggregation caused quenching and the requirement of aggregation or self-organization for LCs. Herein, we developed a new strategy of applying aggregation-induced emission (AIE) phenomenon to the molecular design of LCs towards LLCs. In this report, a calamitic liquid crystal based on tolane with AIE characteristics was successfully synthesized and the chemical structure was characterized by 1H, 13C NMR, and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) high-resolution mass spectra. The fluorescence behavior was studied by fluorescence spectroscopy and the liquid crystal phase behaviors were investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM). The crystal structure was obtained by X-ray diffraction crystallography with P1 space group. Results demonstrated that the sample was AIE active and the LC phases sequence during cooling was nematic, smectic C and smectic B phase. 相似文献
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new series of sulfur-contalning side chain liquid crystalline polymers were described. Mesomorphic side chains with methylene spacer in different length have been synthesized and their structures were identified by NMR, IR and MS.The liquid crystalline nature of the polymers was characterlzed by microscopy.The Polymers have liquid crystalline nature. 相似文献
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new series of sulfur-containing side chain liquid crystalline polymerswere described. Mesomorphic side chains with different terminal groups have beensynthesized and their structures were identified by NMR, FTIR and MS. The polymers have liquid crystalline nature 相似文献
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用硒酚铜簇合物和硫酚铜簇合物[Me4N]2[Cu4(EPh)6](E=Se和S)与CS2及少量S反应,分别获得了以过硫代碳酸根[CS4]^2-为配体的[Me4N]n[Cu(CS4)]n(I)和[Me4N]4[Cu4(CS4)4](Ⅱ)。并用X射线单晶衍射法测定了它们的晶体结构。I为二维层状聚合物,Ⅱ为四核铜簇阴离子化合物。并对[CS4]^2-形成的机理作了讨论。 相似文献
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The title compound,(E)-ethyl 2-(5-(3-methyl-2-butenyloxy)-2-(3-(4-(3-methyl-2-butenyloxy)phenyl) acryloyl) phenoxy)acetate(1),has been synthesized and characterized by FT-IR and 1H-NMR spectroscopy,ESI-MS,and X-ray single-crystal diffraction.FT-IR,1H-NMR and ESI-MS confirm the functional groups,particularly the ethyl groups in the ester moiety,of the compound.The single-crystal X-ray diffraction has revealed a monoclinic structure,space group P21/n with a = 14.6832(14),b = 7.7581(7),c = 23.075(2),β = 101.670(2)o,V = 2574.2(4) ?3,Z = 4,Dc = 1.235 g/cm,μ = 0.085 mm-1,and F(000) = 1024.The skeleton of chalcone in the molecular structure is coplanar. 相似文献
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A series of l-(4′-ethylbiphenylyl) 2-(4-alkoxy-2,3,5,6-tetrafluorophenyl)acetylenes and their nonfluorinated analogues have been prepared. The polarizing microscope observation shows that the fluorinated target compounds exhibit enantiotropic nematic phases, whereas the nonfluorinated analogues show complicated DSC results. The effect of structure modification of the core on mesogenic phases was discussed by comparing the data of fluorinated target compounds with those of corresponding nonfluorinated analogues. 相似文献
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1 INTRODUCTIONIthasbeenreportedthat1,3-diphenyltriazeneshowsautitumoractivitycompa-rabletothatof3,3-dimethyl-1-diaryltriazenes.1,3-diaryltriazenescanactaspro-drugs,orcarrierofdiazoniumcompounds,sincetheyundergohydrolysistoformaryldiazoniumcompounds〔1… 相似文献
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手性液晶掺杂剂(S)┐4┐辛氧基┐4┐(2┐酰氧基┐丙氧基)联苯的合成马汝建李培荣国斌*(华东理工大学化学系上海200237)关键词铁电液晶材料,手性液晶掺杂剂,合成,手征性1997-02-03收稿,1997-08-07修回铁电液晶显示器所用的材料... 相似文献
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We have studied the single particle structural properties of the nematogen trans-4-(trans-4-n-pentylcyclohexyl)cyclohexylcarbonitrile (CCH5) by molecular dynamics simulation using realistic atom-atom potentials. On going from the isotropic phase at 390 K to the nematic phase at 350 K, the molecules become significantly longer and thinner, as indicated by the equivalent molecular moment-of-inertia spheroid and the distribution of trans and gauche bonds. This change is only partly accounted for by the lowering of the temperature, there being a significant quenching effect due to the change in the molecular environment. This quenching effect is also apparent in the distribution of molecular shapes seen in molecular width-breadth contour maps. In the nematic phase, at 350K, the distributions of alkyl tail bond orientations with respect to the director show a pronounced odd-even effect, with peaks in the distributions occurring alternately parallel to, and at an angle to, the director. 相似文献
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含氟丁烯类液晶是一类新型具有低熔点和较高清亮点的液晶材料。 本文提出了一条新的方法合成关键中间体,采用以3-氟苄氯为起始原料,经Arbuzov、Wittig-Horner、催化氢化、锂化-硼酸化4步反应制备,避免了环己烷的异构化和脱氟副反应。 经过合成优化,总收率由4.5%提高到30%,具备较高的应用价值。 物理性能测试表明,该类化合物在配方中的虚拟清亮点达到127.7 ℃、展区常数K11值高达19.7。 光电测试表明,该类化合物能够缩短10%的液晶总响应时间,与该类化合物粘弹系数小的特点相吻合。 新型含氟丁烯液晶为开发高性能混合液晶提供了新的单体液晶材料。 相似文献
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The title compound 3-methyl-1-(4-methylphenyl)-4-(N-4-trifluoromethylphenyl) aminomethyl-5-(4-methoxyphenylthio)-1H-pyrazole has been synthesized via a four-step reaction and characterized by IR,1H NMR,elemental analysis and X-ray crystallography.The compound crystallizes in monoclinic,space group P21/c with a = 8.7170(15),b = 18.355(3),c = 15.292(3) ,β = 103.445(3)°,V = 2379.7(7) 3,Dc = 1.350 g/cm3,Z = 4,μ = 0.184,F(000) = 1008,and the final R = 0.0491 and wR = 0.1339 for 4160 observed reflections(I 2σ(I)).The results demonstrate that there is a face-to-face π-π stacking interaction between one benzene ring(C(19)~C(24)) and another(C(13)~C(18)) at a plane-plane distance of 3.3539 .The ring normal and vector between the ring centroids form an angle of 18.2o up to the centroid-to-centroid distance of 3.5273 .The crystal structure is stabilized by the intermolecular hydrogen bond of N(3)-H(3A)···N(2)(symmetry code:A –x+1,–y+1,–z).The preliminary biological test shows that the title compound has a moderate antifungal activity. 相似文献
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(E)-2-(1-(2-Hydroxy-4-methoxyphenyl)ethylideneamino)-3-(4-hydroxyphenyl)methyl propionate (C22H27O6N, Mr = 401.45) has been synthesized by a condensation reaction of paeonol with tyrosin methyl ester hydrochloride, and its structure was determined by IR, NMR, HR MS and X-ray single-crystal diffraction. The crystal belongs to the monoclinic system, space group P21/c, with a = 11.91291(15), b = 9.49947(12), c = 19.8727(3) , β = 106.1104(15)°, V = 2160.60(5)3, Z = 4, Dc = 1.234 g/cm3, μ = 0.739 mm-1, F(000) = 856, R = 0.0466 and wR = 0.1461 for 3859 observed reflections with (Ⅰ> 2σ(Ⅰ)). In the crystal structure, the title compound is constructed by a centrosymmetric dimmer unit composed of a pair of π-π stacking enantiomers, and such units are linked by intermolecular O(5)-H(5)…O(1) and intramolecular N(1)-H(1)…O(1) hydrogen bonds. 相似文献