The azulene ring as a structural element in liquid crystals

Autor:	Siân E. Estdale, David A. Dunmur, Roger Brettle, Charles M. Marson
Rok vydání:	1997
Předmět:	Stereochemistry General Chemistry Dichroism Azulene Ring (chemistry) Structural element chemistry.chemical_compound Dipole Crystallography chemistry Liquid crystal Phase (matter) Materials Chemistry Pyridinium
Zdroj:	Journal of Materials Chemistry. 7:391-401
ISSN:	1364-5501 0959-9428
DOI:	10.1039/a606139g
Popis:	A new approach to the synthesis of azulene liquid crystals is described based on Hafner’s procedure involving reaction of a pyridinium salt with a cyclopentadienide. The preparation of a variety of liquid crystalline materials using this method is described. Variants are reported with single substituents on the azulene ring in the 6-position and doubly substituted in the 2, 6- positions. The effect of the azulene ring as a core or dipolar terminal structural element is explored. 6-(5-Alkyl-1,3-dioxan-2-yl)azulenes are shown to exhibit smectic A phases and 2-cyclohexyl-6-(5-tridecyl-1,3-dioxan-2-yl)azulene show smectic A and B phases. Phase characterisation of the materials is recorded together with X-ray measurements on the smectic A phase of one representative compound. Results of dichroism studies on the azulene mesogens are also briefly reviewed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d7388e168e113b92b4b791d9c00b5563 https://doi.org/10.1039/a606139g Zobrazit plný text záznamu