S. Takenaka, K. Teshima
Jun 1, 1994
Citations
0
Influential Citations
6
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
This paper describes the thermal properties of 4-nitrophenyl 4-(4-alkoxybenzoyloxy)benzoates and 4-N-[(4-alkoxybenzoyloxy)benzylidene]-4-nitroanilines that have an additional methyl, normal alkoxyl, or hydroxyl substituent on the nitrophenyl group. Methyl and methoxyl groups adjacent to the nitro group reduced the liquid crystalline properties, and derivatives with a long alkoxyl group at the 2 position are nonmesogenic. On the other hand, a hydroxyl group at the 2 position rather enhances the nematic and smectic properties, although a hydroxyl group has a similar volume to the methyl one. The results are discussed in terms of the steric effects of the substituent and electrostatic circumstances around the nitro group.