Several H-2 NMR studies have been performed on two deuterium labelled banana-shaped liquid crystals, the 1,3-phenylene bis(4-4'-(11-undecenyloxy) benzoyloxy) benzoate (Pbis11BB) and its 4-chloro homologue (ClPbis11BB), in the isotropic, nematic and B-2 phases. In this article, the state of the art of these studies is drawn and some new 2H NMR measurements on deuterated banana sub-units, namely the X(benzoyloxy)phenyl benzoate-d(10) (BOB-d(10)) and its 4-chloro homologue (CIBOB-d(10)), used as small probes dissolved in two banana-shaped liquid crystals in the nematic phase are reported. As a general result, the orientational ordering properties of these sub-units are discussed in the frame of recent results obtained on the same banana-shaped liquid crystals dissolved in calamitic nematic solvents as well as in the bulk.
Orientational properties of banana-shaped molecules and their sub-units by means of 2H NMR spectroscopy
DOMENICI, VALENTINA;VERACINI, CARLO ALBERTO
2007-01-01
Abstract
Several H-2 NMR studies have been performed on two deuterium labelled banana-shaped liquid crystals, the 1,3-phenylene bis(4-4'-(11-undecenyloxy) benzoyloxy) benzoate (Pbis11BB) and its 4-chloro homologue (ClPbis11BB), in the isotropic, nematic and B-2 phases. In this article, the state of the art of these studies is drawn and some new 2H NMR measurements on deuterated banana sub-units, namely the X(benzoyloxy)phenyl benzoate-d(10) (BOB-d(10)) and its 4-chloro homologue (CIBOB-d(10)), used as small probes dissolved in two banana-shaped liquid crystals in the nematic phase are reported. As a general result, the orientational ordering properties of these sub-units are discussed in the frame of recent results obtained on the same banana-shaped liquid crystals dissolved in calamitic nematic solvents as well as in the bulk.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
