AnIa3¯dthermotropic cubic phase fromN-alkylpyridinium tetrahalocuprates

Autor:	Marianne Impéror-Clerc, Francesco Neve
Rok vydání:	2004
Předmět:	Diffraction Materials science Liquid crystalline business.industry Local organization General Chemistry Condensed Matter Physics Thermotropic crystal Crystallography Optics Liquid crystal Phase (matter) Structure based General Materials Science business
Zdroj:	Liquid Crystals. 31:907-912
ISSN:	1366-5855 0267-8292
Popis:	The thermotropic liquid crystalline behaviour of two N-alkylpyridinium tetrahalocuprates was investigated. The n-pentadecyl tetrachloro and tetrabromo derivatives (CU15-CL and CU15-BR, respectively) exhibit very similar behaviour on cooling, and specifically, a high temperature smectic phase followed by a cubic phase. We fully elucidated the Ia3¯d space group for the cubic phase from X-ray diffraction on single crystals. The type of cubic phase is still under discussion, but we suggest that it is a direct type of structure based on the known phase sequence of lower and higher homologues. A model for the local organization of CU15-CL and CU15-BR in the cubic and smectic mesophases is also proposed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::360f6979b3f6e6faf2d923036b529f47 https://doi.org/10.1080/02678290410001713351 Zobrazit plný text záznamu