Liquid-crystalline properties of unsaturated piperazine-2,5-dione derivatives

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题名:	Liquid-crystalline properties of unsaturated piperazine-2,5-dione derivatives
作者:	Li,WR;Kao,KC;Yo,YC;Lai,CK
贡献者:	中央大學
关键词:	HEXAGONAL ARRANGEMENTS;COMPLEXES
日期:	1999
上传时间:	2010-06-29 19:47:07 (UTC+8)
出版者:	化學研究所
摘要:	The synthesis, characterization, and mesomorphic properties of a new type of liquid-crystalline compounds, (3Z,6Z)-3,6-bis(3,4-dialkoxybenzylidene)piperazine-2,5-diones are reported. These compounds were derived from unsaturated piperazine-2,5-dione as the core group, and were prepared by condensation reactions of 1,4-diacetylpiperazine-2,5-dione and 3,4-dialkoxybenzaldehydes. The products were characterized by H-1- and C-13-NMR spectroscopy, and elemental analysis, and the phase behavior of these compounds was characterized and studied by differential scanning calorimetry (DSC) and polarization microscopy. The results indicate that these rod-like compounds exhibit smectic C (S-c) phases. However, for the derivatives with two flexible alkoxy side chains, highly ordered smectic G (S-G) phases were also formed and confirmed by X-ray powder diffraction. The liquid crystallinity of these molecules was attributed to the presence of intermolecular hydrogen bonds involving the NH groups of the heterocyclic rings. The correlation of phase behavior and molecular shape is also discussed.
關聯:	HELVETICA CHIMICA ACTA
显示于类别:	[化學研究所] 期刊論文

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