In spite of the appreciable value of the transition dipole moment of the (C=O) vibration in ME6N (4-cyanophenyl-4’-hexylbenzoate) liquid crystal, its NCE (noncoincidence effect) was found very low . We suspected that this was originated by the steric hindrance of the bulky phenyl groups in proximity of the C=O group in ME6N which, acting as intermolecular spacers, may increase the separation between the C=O oscillators in adjacent molecules then reducing the NCE of the corresponding (C=O) Raman band. The results reported in this contribution support this hypothesis.
G.Venditti, A.Arcioni, M.G.Giorgini, M.Musso (2006). Steric hindrance effects of phenyl groups on the noncoincidence effect of the nu(C=O) Raman band in molecular liquids. BARCELONA : s.n.
Steric hindrance effects of phenyl groups on the noncoincidence effect of the nu(C=O) Raman band in molecular liquids
VENDITTI, GIAMPAOLO;ARCIONI, ALBERTO;GIORGINI, MARIA GRAZIA;
2006
Abstract
In spite of the appreciable value of the transition dipole moment of the (C=O) vibration in ME6N (4-cyanophenyl-4’-hexylbenzoate) liquid crystal, its NCE (noncoincidence effect) was found very low . We suspected that this was originated by the steric hindrance of the bulky phenyl groups in proximity of the C=O group in ME6N which, acting as intermolecular spacers, may increase the separation between the C=O oscillators in adjacent molecules then reducing the NCE of the corresponding (C=O) Raman band. The results reported in this contribution support this hypothesis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.