Saddle-shaped tetraphenylenes with peripheral gallic esters displaying columnar mesophases.
Beilstein J Org Chem
; 5: 57, 2009 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-20126633
ABSTRACT
Tetraphenylenes 2 with eight peripheral gallic esters were prepared in two steps from octamethoxytetraphenylene 1 in 19-72% yield. Investigation of the mesomorphic properties of 2 by DSC, POM and X-ray diffraction revealed that derivatives 2a-d with short alkoxy chain lengths (C(5)-C(8)) did not show any mesomorphic properties, whereas compounds 2e-i with C(9)-C(13) chains displayed rectangular columnar mesophases and compounds 2j-l with C(14)-C(16) chains displayed hexagonal columnar mesophases. Furthermore an anomalous odd-even effect of the clearing points of compounds 2e-l versus chain length was detected.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Beilstein J Org Chem
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Alemanha