A series of liquid crystals have been synthesized and studied based upon mononuclear ortho-platinated rod-like heteroaromatic and 1,3-diketonate ligands. The liquid crystalline properties of these molecules were investigated using polarized light optical microscopy, differential scanning calorimetry, single crystal X-ray diffraction, and powder X-ray diffraction. Increasing the number of alkyl chains attached to the 1,3-diketonate units resulted in a transition from lamellar (SmA) to hexagonal columnar phases (Colh). The 2-thienylpyridine units were previously unexplored in metallomesogenic complexes and these studies extend the utility of ortho-platinated 2-phenylpyridines and 2-thienylpyridines to produce columnar liquid crystalline phases. The platinum complexes all display photoluminescence and are of interest for electrooptical applications.
一系列基于单核邻
铂化杆状杂
芳烃和1,3-二
酮配体的
液晶已被合成和研究。使用偏振光显微镜、差示扫描量热法、单晶X射线衍射和粉末X射线衍射对这些分子的
液晶特性进行了调查。增加与1,3-二
酮基团相连的烷基链数量导致从层状相(SmA)转变为六角柱状相(Colh)。2-
噻吩基
吡啶单元在
金属有机
液晶复合物中之前并未涉及,这些研究扩展了邻
铂化
2-苯基吡啶和2-
噻吩基
吡啶的应用,产生柱状
液晶相。所有
铂复合物均显示出光致发光特性,并且对电光应用具有兴趣。