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1.
以水杨醛和邻氨基苯酚为原料来制备希夫碱,以异烟酸和溴代十二烷为原料合成液晶基元异烟酸十二烷基酯,在水和乙醇混合反应体系中与Pd(Ⅱ)过渡金属通过自组装形成配合物。透射电镜形态观测到10~20nm左右的线状形态的纳米胶束。并利用红外光谱,紫外可见吸收光谱手段对其结构和性质进行了表征。 相似文献
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以异烟酸和溴代十二烷为原料合成液晶基元异烟酸十二烷基酯,在水和乙醇混合反应体系中与Cu(Ⅱ)过渡金属通过自组装形成配合物。透射电镜形态观测到50 nm左右的柱状形态的纳米胶束。利用红外光谱、紫外可见吸收光谱手段对其结构和性质进行了表征。 相似文献
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本论文采用水热法,以异烟酸作为配体,与过渡金属盐反应,通过调节反应物配比、反应温度、溶剂、溶液的pH值等实验条件,合成了四个配位化合物;以异烟酸作为主配体、N,N-双氧-4,4-联吡啶作为辅助配体,分别与硫酸锰、硫酸锌反应,合成了两个配位化合物;通过红外光谱对这六种配合物进行了表征,用热重分析法考察了配合物5的稳定性。通过异烟酸配合物一方面为进一步实现特定结构新配合物的设计合成提供实验依据,另一方面它们可能成为有效的药物,磁性材料或光学材料,这部分工作正在进行中。 相似文献
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利用溶液法,设计合成了3,5-二溴水杨醛缩乙醇胺席夫碱及其铜(Ⅱ)配合物,通过紫外光谱﹑红外光谱﹑热重分析等技术对目标产物的结构进行了表征和确认.以催化活性为指标,考察了3,5-二溴水杨醛缩乙醇胺、3,5-二溴水杨醛缩氨基甲磺酸、3,5-二溴水杨醛缩牛磺酸3种席夫碱的铜(Ⅱ)配合物催化过氧化氢氧化抗坏血酸的反应,结果表明3种席夫碱铜(Ⅱ)配合物均具有辣根过氧化物酶(HRP)的催化功能,催化效果为乙醇胺席夫碱铜(Ⅱ)配合物>氨基甲磺酸席夫碱铜(Ⅱ)配合物>牛磺酸席夫碱铜(Ⅱ)配合物.研究了乙醇胺席夫碱铜(Ⅱ)配合物催化过氧化氢氧化抗坏血酸的反应动力学,并初步探讨了催化反应机理. 相似文献
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寡聚酸合铜(Ⅱ)配合物的合成及表征 总被引:1,自引:0,他引:1
在水-乙醇体系中,以寡聚酸钾与Cu2+离子反应合成寡聚酸合铜(Ⅱ)配合物,采用正交实验,考察了V(水)∶V(乙醇)、反应温度、反应时间对螯合反应的影响,最优反应条件为:V(水)∶V(乙醇)=1∶4,40℃,6 h。采用红外光谱,紫外光谱和差热-热重分析对寡聚酸合铜(Ⅱ)配合物进行了表征。红外光谱和紫外光谱分析均表明,Cu2+与寡聚酸配位。寡聚酸合铜(Ⅱ)配合物中金属配位方式为单齿配位。热分析表明,配合物在190℃之前是稳定的,其分解过程是逐步进行的。初步应用实验表明,叶面喷施稀释100 000倍的寡聚酸合铜(Ⅱ)促进了花生的生长发育。 相似文献
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Vladimir S. Bystrov 《Ferroelectrics Letters Section》1997,23(3):87-93
Ferroelectric liquid crystal models of voltage-dependent ion channels are discussed quantitatively. The consequences of the hypothesis that the gating mechanism of ion channels is a transition of a ferroelectric liquid crystal component of a biomembrane, in which the tilt angle of the S4 segments decreases to zero, are analyzed. 相似文献
12.
液晶聚氨酯的合成与性质 总被引:3,自引:1,他引:2
采用熔融酯交换法合成端基为羟基的液晶复合二酸二丁二醇酯(TOBB),再与2,4-TDI或MDI反应;或用聚己二酸丁二醇酯二醇(PBA)替代部分TOBB制备液晶聚氨酯。用差热扫描量热仪和偏光显微镜检测其液晶性。结果表明:PBA替代部分TOBB后,降低聚氨酯相转变温度,中介相温度范围变窄。 相似文献
13.
通过离子交换和络合作用合成蒙脱石负载铜(Ⅱ)-水杨醛缩-β-丙氨酸复合材料[Cu(Ⅱ)-L/MMT]。采用XRD和FT-IR对该复合材料进行了表征,并考察了其对结晶紫的吸附性能及影响因素。结果表明,铜(Ⅱ)配合物已成功插入蒙脱石层间;溶液p H、复合材料投加量、吸附时间及结晶紫的初始浓度对复合材料吸附去除结晶紫有较大影响。与原土相比,[Cu(Ⅱ)-L/MMT]对结晶紫的去除效果明显提高。该复合材料对结晶紫的吸附等温线符合Langmuir模型,吸附行为符合拟二级动力学模型。 相似文献
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Electrochemiluminescence (ecl) of rubrene was studied in nematic liquid crystal 4-cyano-4′-n-pentylbiphenyl. A thin-layer cell of indium-tin oxide glass with an electrode distance of 5 μm was fabricated with a treatment for molecular aligning of a twisted nematic display of the liquid crystal. In cyclic voltammetric scans up to ± 100 V, a fairly stable emission was observed in the voltage range over ± 50 V. whereas the molecular alignment of the liquid crystal was induced at a usual voltage around ± 5 V. The generation of ecl at such a high voltage was interpreted in terms of electrohydrodynamic convection which was induced under a high electric field in an electrolyte-free system. Other nematic liquid crystals such as phenylcyclohexanes and phenylpyrimidines were examined using rubrene, tris(2,2′-bipyridine)ruthenium ion and p-(9′-anthryl)-N,N-dimethylaniline, as the ecl molecule, but they gave either less stable than 4-cyano-4′-n-pentylbiphenyl, or no emission. 相似文献
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Muklesur Rahman Chien-Wen Hsieh Chun-Tsai Wang Bo-Ru Jian Wei Lee 《Dyes and Pigments》2010,84(1):128-133
Dielectric relaxation spectroscopic studies were undertaken to investigate the role of the resistivity of a host liquid crystal in the relaxation dynamics of dyed systems. Two different types of liquid crystal mixture were used, namely, one that was characterized by high ion contamination and low resistivity and the other which was of high resistivity and virtual ion-free; both types were doped using an azo or anthraquinone dye. Dielectric spectra of both the pristine liquid crystals and their composites at different external fields were measured in homogenously-aligned cells. The use of both dyes on an ion-enriched liquid crystal not only enhanced ion concentration but also slowed down the relaxation process. In contrast, the relaxation process for composites with a high-resistivity liquid crystal host was faster than that of the pristine liquid crystal. 相似文献
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The forming mechanism of microemulsion of sodium dodecyl sulfonate.alcohols,water and isooctane was studied,with particular emphasis on the effect of molecular weight and concentration of alocohols.Phase diagram of the four components,alcohol, sodium dodecyl sulfonate,water and isooctane,was used as a means of study,through which the microemulsion regions were determined.Phase diagram of sodium dodecyl sulfonate/n-pentanol/isooctane/water system at km=2(km=Wn-pentanol/WSDS)is presented. The variation of conductivities of different microemulsion samples with water was measured.From the conductivities we investigated a change in structure from water droplets in oil(W/O)at low water content to liquid crystal at intermediate water content and a structure of oil droplets in water(O/W)at high water content. 相似文献
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David A. Glassner Eric A. Grulke 《Journal of the American Oil Chemists' Society》1986,63(8):1066-1071
The surfactant concentration, the electrolyte concentration, the detergent solution to tallow weight ratio and the crystal surface area affect the olein yield from the detergent fractionation of tallow. Three crystal sizes were produced by using various rates of cooling for the partial crystallization step. The amount of sodium dodecyl sulfate (SDS) needed to maximize olein yield was proportional to the surface area of the crystals. The olein yield of the separation increased with increasing detergent solution to tallow weight ratio and increased with increasing electrolyte concentration up to their optimum levels. 相似文献
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合成了一种三齿配体N-(4-甲基苯)-N′-(2-(4-甲基苯氨基)乙基)乙烷-1,2-二胺,并制备了它的3种过渡金属配合物[ML(H2O)2Cl]Cl(M=CuⅡ,CoⅡ,NiⅡ),用元素分析、核磁、红外和摩尔电导等表征了配体及其金属配合物的组成和结构。对Ni—L进行了单晶结构解析,配合物为六配位的八面体结构,配体采用三齿配位。利用紫外光谱和荧光光谱法研究了配合物与小牛胸腺DNA的作用方式,结果表明,3种金属配合物可能以静电方式与DNA作用。Cu—L、Ni—L、Co—L3种配合物与DNA的结合常数分别为2.99×104、9.78×103、3.66×103。 相似文献
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以正交法研究了以4 硝基 4′ 氯二苯甲酮为原料电合成4 氨基 4′ 氯二苯甲酮过程。实验结果表明,以ρ(4 硝基 4′ 氯二苯甲酮)=18 0g/L溶液为原料,与ρ(硫酸钛)=18 0g/L溶液、c(H2SO4)=1 1mol/L硫酸溶液组成电解液,于无隔膜电解池中,在75~80℃、电流密度5A/dm2的条件下,电合成4 氨基 4′ 氯二苯甲酮的收率为82 7%。产物经过高效液相色谱归一法测定,质量分数为99 1%。 相似文献
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以8-(4-碘苯基)氟硼吡咯为原料,与4-乙炔基苯基胆甾醇酯或4-乙炔基苯戊基双环己基甲醇酯进行Sonogashira偶联反应,制备了两个含氟的荧光二向性液晶染料DC-1和DC-2,其化学结构均由1HNMR、13CNMR和HRMS鉴定。将染料DC-1和DC-2进行光谱测试,最大吸收波长和最大发射波长分别在503和517 nm,发亮绿色荧光。基于宾-主(G-H)效应,将染料DC-1和DC-2作为宾体组分溶于主体液晶E7中,测得DC-2在液晶E7中的吸收二向色比高达8.91,有序参数为0.73,可应用在宾-主型液晶显示器(GH-LCD)中。经差热扫描量热仪(DSC)测试,染料DC-1和DC-2在一定温度范围内具有介晶性质,并通过偏光显微镜(POM)验证了DC-1和DC-2的液晶织构。 相似文献