Synthesis and properties of novel 1,1‐difluoropropoxy‐linked liquid crystalline compounds of negative dielectric anisotropy

Autor:	SHuichi Matsui, Yasuyuki Sasada, Teru Shimada, Makoto Ushioda
Rok vydání:	2007
Předmět:	Phase transition Birefringence Materials science Physics::Optics chemistry.chemical_element General Chemistry Electron Dielectric Condensed Matter Physics Viscosity Crystallography chemistry Liquid crystal Fluorine Organic chemistry Moiety General Materials Science
Zdroj:	Liquid Crystals. 34:569-576
ISSN:	1366-5855 0267-8292
DOI:	10.1080/02678290701284279
Popis:	A series of liquid crystalline compounds having the difluoropropyleneoxy moiety (–OCF2C2H4–) as a linking group has been synthesized. The physical properties, i.e. dielectric anisotropy, birefringence, viscosity and phase transition temperatures, have been measured. This novel class of compounds shows a larger negative dielectric anisotropy than the corresponding compounds having a propyleneoxy (–OC3H6–) linking group. Their dielectric properties may be explained by the combined effect of fluorine atoms with large electron negativities and the electron donating feature of an oxygen atom substituted on the same carbon atom. The semi‐empirical quantum calculation method (AM1) also confirmed this dielectric behaviour of the difluoropropyleneoxy linkage group.
Databáze:	OpenAIRE
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