科研之友
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摘要
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 degrees 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.
- 出版日期2009
