Asymmetric dimeric liquid crystals with charge transfer groups

Autor:	George S. Attard, C. T. Imrie, C. G. Hickman, L. Taylor, S. Garnett
Rok vydání:	1990
Předmět:	Crystallography Materials science Liquid crystal Phase (matter) Molecule Organic chemistry General Materials Science Charge (physics) General Chemistry Condensed Matter Physics
Zdroj:	Liquid Crystals. 7:495-508
ISSN:	1366-5855 0267-8292
DOI:	10.1080/02678299008033826
Popis:	Two series of asymmetric dimers, the α-(4-n-butylanilinebenzylidene-4′-oxy)-ω-(4-nitroazobenzene-4′-oxy) alkanes and the α (4-dimethylaminoanilinebenzyl-idene-4′-oxy)-ω-(4-nitroazobenzene-4′-oxy)alkanes have been synthesized. Their thermal properties are compared with those of the symmetric dimers, the α,ω-bis(4-nitroazobenzene-4′-oxy)alkanes and the αω-bis(4-n-butylanilinebenzyl-idene-4′-oxy)alkanes. The asymmetric dimers exhibit a semectic A phase for which the ratio of the layer spacing to the molecular length is approximately 0.5; this is thought to imply an intercalated structure in which different parts of the molecule interleave. We propose that this structure is stabilized by a charge transfer interaction.
Databáze:	OpenAIRE
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