Columnar mesophases from half-discoid platinum cyclometalated metallomesogens
Columnar mesophases from half-discoid platinum cyclometalated metallomesogens
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DOI：
10.1039/b714291a
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发表时间：
2008-01
影响因子：
--
通讯作者：
K. Venkatesan;P. Kouwer;S. Yagi;P. Müller;T. Swager
中科院分区：
文献类型：
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作者：
K. Venkatesan;P. Kouwer;S. Yagi;P. Müller;T. Swager
合成了一系列以单核邻位铂化的棒状芳香杂环化合物和1，3-二酮配体为基础的液晶化合物。利用偏光显微镜、差示扫描量热法、单晶X射线衍射和粉末X射线衍射研究了这些分子的液晶性质。增加连接到1，3-二酮单元的烷基链的数量导致从层状（SmA）到六方柱状相（Colh）的过渡。2-噻吩基吡啶单元以前在金属介晶配合物中未被探索，这些研究扩展了邻位铂化的2-苯基吡啶和2-噻吩基吡啶产生柱状液晶相的效用。铂配合物都显示光致发光，并感兴趣的电光应用。
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.