N,N-二[4-(9H-9-咔唑基)苯基]-3,5-二溴苯胺的合成

以3,5-二溴苯胺,碘苯和咔唑为原料,经取代和Ullmann反应合成了一个新的含咔唑三苯胺化合物——N,N-二[4-(9H-9-咔唑基)苯基]-3,5-二溴苯胺,其结构经1H NMR,13C NMR和ESI-MS表征。     

Inhibition of Homo-coupling of Arylboronic Acids in Ligand Free Pd（ll）-Catalyzed Suzuki Reaction

A series of solvents were examined for the ligand free Pd（II）-catalyzed Suzuki reaction of 4-bromotoluene with phenylboronic acid. It was found that the PdCl2/i-PrOH system could efficiently inhibit the homo-coupling of phenylboronic acid and give a cross-coupling product in high yields. The substrates with a wide variety of functional groups were tolerated in the system. A possible mechanism for this system was proposed.     

基于液晶调制光偏振的荧光量子点显示模式

传统的显示器由于滤色器的存在，有较大的功耗且能量利用率不高。本文提出了一种利用液晶调制紫外光偏振态以实现对受到局域表面等离子体共振影响的荧光量子点光强调制的方法，所设想的显示设备由用于产生局域表面等离子体共振的金属纳米结构、附着于金属纳米结构电场热区的荧光量子点和基于液晶结构的光偏振调制模块组成。对单个像素的情况进行了理论模拟和原理分析，计算了若干金属纳米结构对不同偏振态的紫外光的响应。理论验证了特定金属纳米结构的表面等离子体光强放大效应，通过电子束刻蚀和半导体沉积等技术手段可在光强放大的电场热区植入荧光量子点，受到紫外光偏振态调制的金属表面等离子体产生可控的光强增强或减弱，进而激发或者抑制相应颜色的量子点发出不同颜色的光，使其可以用于显示。提出了一种新颖的显示模式，不同于传统显示，其具有较高的能量利用率和较大的色域，虽然其存在色彩对比度较低、分辨率不够高等问题，但提议确实为人们日常的信息显示提供了一种新的思路和一种潜在可能，相信随着技术的进步和设计结构的优化，这种光偏振态调制受表面等离子体激励的荧光量子点的方法可以在显示以及非显示领域获得应用。     

Liquid crystal Fresnel lens display

A novel see-through display with a liquid crystal lens array was proposed.A liquid crystal Fresnel lens display(LCFLD) with a holographic screen was demonstrated.The proposed display system has high efficiency,simple fabrication,and low manufacturing cost due to the absence of a polarizer and color filter.     

Effect of fluorine groups and different terminal chains on the electro-isomerization of azobenzene liquid crystals

A series of azobenzene liquid crystals with one or two terminal acrylate groups were synthesized and their polymers were fabricated.The azobenzene liquid crystals and their polymers achieved the photoisomerization from the liquid crystalline trans-isomer to the isotropic cis-isomer with UV irradiation.Then,the cis to trans isomerization induced by an electric field was studied,the time required for electro-isomerization was measured,the texture change and absorption variation from cis to trans form induced by the electric field were observed clearly,and the time required for electro-isomerization was much shorter than that for thermal relaxation.The influence of the polar group(fluorine),terminal acrylate group,and flexible alkyl chain on the time of electro-isomerization was studied.The results show that the compounds with polar fluorine group require shorter time for electro-isomerization and the polymerization of terminal acrylate group delays the electro-isomerization.     

红外激光诱导异丙醇催化裂解反应

用CW CO_2激光器研究了异丙醇在有催化剂和无催化剂时的裂解反应。有催化剂存在下,诱导裂解反应所需的阈值激光功率比无催化剂时的小,反应产物取决于异丙醇在催化剂表面上的吸附状态,讨论了激光诱导表面反应的机理。     

香蕉形非手性铁电(反铁电)液晶

香蕉形非手性液晶分子是近年来新发现的一类特殊的具有电光性能(铁电性、反铁电性)的液晶分子。这类分子由于具有独特的弯曲形状。表现出不同于棒状分子的液晶性能，尽管分子本身不含手性基团。但其极性排布形成铁电性(反铁电性)，而且有很高的自发极化值。对已发现的铁电性(反铁电性)香蕉形化合物希夫碱类、酯类等的分子结构、特性及研究状况做了详细介绍。     

含氟反式环己基联苯液晶的合成

分别以PdCl2或Pd2(dba)3(CHCl3)作催化剂,K3PO4作碱,吡啶为溶剂,通过Suzuki交叉偶联反应合成了3个含氟反式环己基联苯液晶。与PdCl2相比,Pd2(dba)3(CHCl3)催化效力高,用量少(摩尔分数为0.25%),能有效催化多氟-反式环己基联苯类液晶的合成,纯产品产率达80%～67%,该反应体系简单、高效,催化剂合成储存方便,经济实用,具有较高的工业应用前景。     

一步法合成4-(反式-4''''-正戊基环己基)环己酮

以较少量(质量分数4%)的国产商品化钯/炭为催化剂,在温度160℃,压力0.60～O.70 MPa条件下,由4-(反式-4'-正戊基环己基)苯酚加氢合成了4-(反式-4'-正戊基环己基)环己酮,酚的转化率为97.1%,酮的选择性为85.5%,加以高锰酸钾氧化进行后处理,少量原料酚可直接氧化去除,醇则氧化为目标酮,总收率85.2%.该反应体系催化剂用量较少,且安全与环保.