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Titolo:
Nematic-isotropic transition temperature and dipole-dipole interaction. 4-X-substituted phenyl 4-(4-Y-substituted benzylideneamino)-benzoates
Autore:
Matsunaga, Y; Hikosaka, L; Hosono, K; Ikeda, N; Sakatani, T; Sekiba, K; Takachi, K; Takahashi, T; Uemura, Y;
Indirizzi:
Kanagawa Univ, Fac Sci, Dept Mat Sci, Hiratsuka, Kanagawa 2591205, Japan Kanagawa Univ Hiratsuka Kanagawa Japan 2591205 a, Kanagawa 2591205, Japan
Titolo Testata:
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
, volume: 363, anno: 2001,
pagine: 51 - 60
Fonte:
ISI
Lingua:
ENG
Soggetto:
MESOMORPHIC PROPERTIES;
Keywords:
nematic; terminal groups; dipole-dipole interaction; anti-parallel dimerization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
6
Recensione:
Indirizzi per estratti:
Indirizzo: Matsunaga, Y 6-45-219 Ryujo Ga Oka, Hiratsuka, Kanagawa 2540814, Japan 6-45-219 Ryujo Ga Oka Hiratsuka Kanagawa Japan 2540814 Japan
Citazione:
Y. Matsunaga et al., "Nematic-isotropic transition temperature and dipole-dipole interaction. 4-X-substituted phenyl 4-(4-Y-substituted benzylideneamino)-benzoates", MOLEC CRYST, 363, 2001, pp. 51-60

Abstract

The nematic-isotropic transition temperature of 4-X-phenyl 4-(4-Y-benzylideneamino)benzoates, where the terminal groups X and Y are CN, CH3O, NO2, Cl, Br, N (CH3)(2), CH3, F, or CF3, was examined. The transition temperature difference between the two series, in which X or Y=CH3O and F, respectively, decreases in this order: CF3 > NO2 > Cl = Br = F > CN > CH3 > CH3O > N (CH3)(2). Thus, the groups are almost in the order of substituent constants except for the CN group, suggesting that the dipole-dipole interaction contributes significantly to the nematic thermal stability and also that the effective dipole moment of the molecule bearing CN and CH3O groups is markedlyreduced in the mesophase from that of the free molecule because of the anti-parallel molecular association.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 13:43:19