B. Ringstrand, H. Monobe, P. Kaszyński
Jun 30, 2009
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Influential Citations
44
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Journal
Journal of Materials Chemistry
Abstract
Two series of structurally analogous esters (1) and diazenes (2) derived from the [closo-1-CB9H10]− anion and containing two or three rings in the rigid core were prepared and their liquid crystalline properties investigated. Salts containing NMe4+ or NHEt3+ counterion do not exhibit mesophases, whereas the ion pairs with N-butyl-4-heptyloxypyridinium cation [Pyr] exhibit SmA and occasionally soft crystalline phases in the temperature range of 90–180 °C. Three representative ionic liquid crystals, 1d[Pyr], 1f[Pyr] and 2d[Pyr], were investigated by powder XRD. Absorption spectroscopy demonstrated that ester 1e[Pyr] is transparent above 280 nm and the diazene 2e[Pyr] exhibits absorption bands typical for azobenzene derivatives.