Discotic metallomesogens: mesophase crossover of columnar rectangular to hexagonal arrangements in bis(hydrazinato)nickel(II) complexes

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题名:	Discotic metallomesogens: mesophase crossover of columnar rectangular to hexagonal arrangements in bis(hydrazinato)nickel(II) complexes
作者:	Lai,CK;Tsai,CH;Pang,YS
贡献者:	中央大學
关键词:	LIQUID-CRYSTALS;TRANSITION-METALS;ORDERED MESOPHASES;MESOMORPHIC PROPERTIES;SHAPES;ASSEMBLIES;PALLADIUM;MOLECULES;PHASES
日期:	1998
上传时间:	2010-06-29 19:47:30 (UTC+8)
出版者:	化學研究所
摘要:	Three series of N-(3,4-dialkoxybenzylidene)-N'-(3',4',5'-trialkoxylbenzoyl)hydrazine and their nickel(II) complexes, bis [N-(3,4-dialkoxybenzylidene)-N'-(3',4',5'-trialkoxybenzoyl) hydrazinato]nickel(II), were prepared and characterized. The mesomorphic properties of these disc-like compounds were also studied in terms of liquid crystallinity. The orange nickel(II) complexes with ten soft alkoxy side chains exhibited columnar disordered mesophases, which were characterized based on DSC analysis and optical polarized microscopy. Nickel complexes with shorter side chains (n = 5-8) displayed a monotropic columnar rectangular disordered (Col(rd)) phase; however, complexes with longer side chains showed monotropic (n = 10) and enantiotropic (n = 12, 14) columnar hexagonal disordered (Col(hd)) phases. Similar nickel complexes (n = 14) with eight side chains exhibited a columnar hexagonal phase, whereas complexes (n = 14) with six side chains formed crystalline phases. The structures of these columnar disordered phases were confirmed by X-ray powder diffraction. XRD data indicated that mesophase crossover from columnar rectangular (Col(r)) to hexagonal arrangements (Col(h)) was observed with increasing side chain lengths.
關聯:	JOURNAL OF MATERIALS CHEMISTRY
显示于类别:	[化學研究所] 期刊論文

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