Structure and order of a homologous series of bent-core molecules: a 13C NMR study.
A carbon-13 NMR study in a series of bent-core (banana-shaped) molecules is reported. In 1, 3- phenylene bis[4'-alkenyloxy biphenyl]-4-carboxylate derivatives the position of the chlorine substituent(s) connected to the central phenyl ring and/or the terminal chain length of the compounds were varied. By analyzing the observed chemical shift anisotropies, the order parameters S and bending angles in their nematic phase are compared. The biphenyl moiety on each arm of the molecular core is found to form a nonzero twist angle.
Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada.
Ronald Y
RY
Dong
J
J
Xu
G
G
Benyei
K
K
Fodor-Csorba