1,3,4-噻二唑类液晶化合物的研究进展

综述了近年来1,3,4-噻二唑类液晶化合物的研究进展,该类化合物形成棒状液晶、楔形液晶、弓形液晶、Polycatenar液晶、盘状液晶的分子结构及其自组装形成的液晶相结构。介绍了分子中末端基团、烷基链数目、刚性核长度等结构常数对液晶自组装结构的的影响。与含氧的杂环类似物1,3,4-噁二唑液晶化合物相比,1,3,4-噻二唑类液晶化合物的液晶性、光电性等更加优越。液晶方面类比表明,它具有更好的液晶性质。     

液晶化合物的研究进展

综述了近年液晶化合物的研究和发展现状,从含氟液晶化合物、偶氮苯类液晶化合物和环己烷类液晶化合物三方面介绍了相关液晶化合物的合成及性能,并就液晶化合物今后的发展前景进行了分析与展望。     

液晶化合物的研究进展

综述了近年液晶化合物的研究和发展现状,从含氟液晶化合物、偶氮苯类液晶化合物和环己烷类液晶化合物三方面介绍了相关液晶化合物的合成及性能,并就液晶化合物今后的发展前景进行了分析与展望。     

二苯乙炔类液晶的合成和相变研究

以碘代烷氧基苯与烷基苯乙炔为中间体，采用为催化剂偶联的方法合成了二苯乙炔类液晶化合物，通过对这类液晶化合物的相变研究，证实这类液晶化合物具有优良的液晶性能。     

含二苯并-18-冠-6单元的酰胺型双臂冠醚化合物的合成

合成了２个含二苯并－１８－冠－６单元的酰胺型双臂冠醚化合物,其结构经ＩＲ、＾１ＨＮＭＲ、ＭＳ和元素分析确证,该２个化合物都不具有液晶性,探讨了冠醚结构与液晶性的关系。     

2-氨基-5-[二-（4-氟苯）甲基]硫代-1,3,4-噻二唑席夫碱的合成及生物活性研究

通过缩合反应合成了4个含二-(4-氟苯)甲基Schiff碱的1,3,4-噻二唑新化合物.产物的结构经熔点测定和质谱、红外光谱、核磁共振氢谱分析,对其结构进行确证,并测试了化合物的抑菌活性.其中两个化合物表现出较强的抑菌活性.为今后深入研究该类化合物提供了重要的借鉴作用.     

含2,3,5,6-四氟亚苯基负性液晶合成及液晶性研究

设计并合成了2类含氟液晶化合物,分别为4-[（4-正烷氧基-2,3,5,6-四氟苯基）乙炔基]苯甲酸（2,3-二氟-4-正烷基）苯酯和4-[（4-正烷氧基-2,3,5,6-四氟苯基）乙基]苯甲酸（2,3-二氟-4-正烷基）苯酯,通过偏光显微镜和差示扫描热仪的检测发现,前者全氟乙炔类的液晶化合物为向列相液晶,液晶性能良好,具有较高的清亮点;后者全氟乙基类的液晶化合物不具有液晶性。2类目标化合物分别是通过sonogashira交叉偶联反应和钯催化加氢还原反应得到的。     

1,3,4-噁二唑类液晶化合物研究进展

介绍了近年来1,3,4-噁二唑类液晶研究进展,包括线型、星型1,3,4-噁二唑类液晶及带1,3,4-噁二唑基团的聚合物液晶。介绍了这类化合物结构与液晶性能及光电性能间的关系,所有的研究表明这类物质在制备光电器件方面具有广泛的应用前景。     

苯并噻二唑共轭有机分子合成研究进展

2,1,3-苯并噻二唑(BTD)共轭有机分子具有优异的光电特性,广泛应用于有机发光二极管、太阳能电池、液晶、荧光探针、光电管等方面。综述了以金属催化的偶联反应为关键步骤的2,1,3-苯并噻二唑(BTD)共轭有机分子的合成方法,包括Suzuki偶联反应,Stille偶合反应,Heck偶联反应,Sonogashir偶联反应,Nigishi偶联反应,Ullmann偶联反应等。     

4,7-二（2,3-二氢噻吩并[3,4-b][1,4]二噁英-5-基）苯并[1,2,5]噻二唑的合成及其电聚合

聚噻吩的重要衍生物聚（3,4-乙撑二氧噻吩）（PEDOT）是应用最成功的导电高分子聚合物之一。以苯并噻二唑为受体单元,设计合成了前驱体化合物4,7-二（2,3-二氢-噻吩并[3,4-b][1,4]二噁英-5-基）苯并[1,2,5]噻二唑（EDOT-BT-EDOT）,发现其具有优异的桔红色发光性能,对其进行电聚合能够获得相应聚合物材料P（EDOTBT-EDOT）。聚合物材料表现出良好的电化学活性和稳定性以及平整致密的表面形貌。     

Development and Electronic and Photonic Characteristics of Thiophene/Phenylene Co-Oligomers

A novel class of organic semiconducting materials, thiophene/phenylene co-oligomers (TPCO), has been developed and synthesized. The materials are formed into crystals of high quality in a gas or liquid phase. These crystals exhibit unique optoelectronic properties such as a high carrier mobility and high quantum yield of emission. The transport properties have been studied on a device configuration of the field-effect transistor. The laser oscillation has definitively been observed for single crystals of the TPCO materials. In this article these optoelectronic features are presented and summarized.     

全氟环戊二芳基乙烯多功能分子开关的研究进展

全氟环戊二芳基乙烯是近年来国内外备受关注的一类光致变色化合物.其优良的热稳定性、抗疲劳性,使其很有可能成为一种新型的超高密度信息存储、分子开关及光通信材料.主要介绍了该类化合物的结构异构所表现的不同特性的光/热控分子开关、电化学开关、荧光开关、手性开关和液晶等分子开关,并展望了该类化合物的发展前景.     

Ionic Discotic Liquid Crystals

Ionic discotic liquid crystals are salts of discotic liquid crystals that may display lyotropic and thermotropic mesomorphism. Columnar structures of π-π stacking ionic discotic liquid crystals function not only as anisotropic organic semiconductors, similar to their neutral analogues, but they may also efficiently conduct ions. This combination of electronic and ionic conduction is only one of several unique properties that these materials may display, but their systematic investigation has been limited because of their often complex synthesis, purification, and characterization. However, a comprehensive account of existing reports on ionic discotic liquid crystals is not straightforward, despite their relatively small number, because publications are scattered across different areas of research, such as liquid crystals, ionic liquids, and ionic self-assembly. This review intends to provide a concise but comprehensive overview of the published work on ionic discotic liquid crystals and related compounds and is expected to stimulate further exploration. Highlighted in this review is the mesomorphism of ionic discotic liquid crystals and its dependence on structural changes, which is also the focus of most reported studies. Particular attention was given to the dependence of mesomorphism on the location and types of the charged groups as these are parameters unique to these compounds. Also described are electronic, optical, and other properties of these materials if reported.     

Photoluminescent supramolecular liquid crystals formed by hydrogen bonding of non-mesogenic donor and acceptors

Two types of photoluminescent supramolecular liquid crystals were prepared by combining non-mesogenic molecules through hydrogen bonding. Phloroglucinol and 1,3,5-cyclohexanetricarboxylic acid were employed as core molecules and styrylstilbazole peripheral unit was complexed to form star-shape liquid crystals. Their thermal transition behaviors, structures, and optical properties were examined. The complexations of core and peripherals made the resulting compounds form luminescent star-shaped liquid crystals. The prepared luminescent supramolecules exhibited rectangular and hexagonal columnar order, and one of the liquid crystals was highly luminescent. The structures of the columnar phases found for these systems were discussed in relation to the E-shaped conformer of the complexes.     

One-dimensional self-assembly of planar pi-conjugated molecules: adaptable building blocks for organic nanodevices

In general, fabrication of well-defined organic nanowires or nanobelts with controllable size and morphology is not as advanced as for their inorganic counterparts. Whereas inorganic nanowires are widely exploited in optoelectronic nanodevices, there remains considerable untapped potential in the one-dimensional (1D) organic materials. This Account describes our recent progress and discoveries in the field of 1D self-assembly of planar pi-conjugated molecules and their application in various nanodevices including the optical and electrical sensors. The Account is aimed at providing new insights into how to combine elements of molecular design and engineering with materials fabrication to achieve properties and functions that are desirable for nanoscale optoelectronic applications. The goal of our research program is to advance the knowledge and develop a deeper understanding in the frontier area of 1D organic nanomaterials, for which several basic questions will be addressed: (1) How can one control and optimize the molecular arrangement by modifying the molecular structure? (2) What processing factors affect self-assembly and the final morphology of the fabricated nanomaterials; how can these factors be controlled to achieve the desired 1D nanomaterials, for example, nanowires or nanobelts? (3) How do the optoelectronic properties (e.g., emission, exciton migration, and charge transport) of the assembled materials depend on the molecular arrangement and the intermolecular interactions? (4) How can the inherent optoelectronic properties of the nanomaterials be correlated with applications in sensing, switching, and other types of optoelectronic devices? The results presented demonstrate the feasibility of controlling the morphology and molecular organization of 1D organic nanomaterials. Two types of molecules have been employed to explore the 1D self-assembly and the application in optoelectronic sensing: one is perylene tetracarboxylic diimide (PTCDI, n-type) and the other is arylene ethynylene macrocycle (AEM, p-type). The materials described in this project are uniquely multifunctional, combining the properties of nanoporosity, efficient exciton migration and charge transport, and strong interfacial interaction with the guest (target) molecules. We see this combination as enabling a range of important technological applications that demand tightly coupled interaction between matter, photons, and charge. Such applications may include optical sensing, electrical sensing, and polarized emission. Particularly, the well-defined nanowires fabricated in this study represent unique systems for investigating the dimensional confinement of the optoelectronic properties of organic semiconductors, such as linearly polarized emission, dimensionally confined exciton migration, and optimal pi-electronic coupling (favorable for charge transport). Combination of these properties will make the 1D self-assembly ideal for many orientation-sensitive applications, such as polarized light-emitting diodes and flat panel displays.     

Poling effect on optical and dielectric properties of Pr3+-doped Na0.5Bi0.5TiO3 ferroelectric single crystal

In recent years, with increased environmental awareness, more and more research has been carried out for lead-free ferroelectric materials. Among such materials, Na_0.5Bi_0.5TiO₃ (NBT) single crystal has become a material of interest due to its high Curie temperature. In this study, Pr-doped NBT crystals were prepared and poled along different crystal orientations. The effects of different crystal orientations and poling on the optical properties of Pr-doped NBT crystals were investigated. The optical transmission of the crystal decreases after poling along the [001] orientation and increases after poling along the [111] orientation. The emission and excitation spectra show that the poled process enhances the crystal luminescence. The dielectric constant dependence on temperature for different crystal orientations was measured. The domain structure was measured to explain the changes in the optical properties. The optical properties of a Pr-doped NBT single crystal were modulated by poling along different crystal orientations, which is expected to improve the performance of optoelectronic devices based on such materials.     

Polymer blends containing liquid crystals: A Review

This paper reviews the literature of polymer blends containing low and high molar mass liquid crystals. Low molar mass liquid crystals have been used as plasticizers for thermoplastic polymers and in applications such as electrooptics, optical recording media, and membranes. High molar mass liquid crystalline polymers have been primarily used in polymer blends as processing aids and as an incipient reinforcing phase for “self-reinforced” materials. This review discusses the phase behavior, rheology, and mechanical properties of these blends.     

具有聚集诱导发光性质的液晶材料 研究进展

介绍了四苯基乙烯类、二苯基丙烯腈类、二苯基乙炔类、聚集诱导发光分子修饰的苯并菲类以及其他的具有聚集诱导发光性质的液晶材料,重点阐述了它们的聚集诱导发光性质和液晶自组装性质,并说明了各自的构效关系。综合文献报道可知:将发光液晶材料应用在光电器件上能极大地节约成本和减少能耗。最后指出,在合成该类发光液晶材料时,需合理地利用聚集诱导发光基团和液晶基团,且研究重点应集中在此类材料发光机理的研究和应用范围的拓展上。