High-resolution proton and natural abundance carbon-13 NMR spectra of a rigid chiral molecule, (&)-p-(trichloromethy1)-p-propiolactone, dissolved in the liquid-crystalline phase of poly(y-benzyl-L-glutamate) (PBLG), in methylene chloride, were analyzed. From the NMR data and the X-ray structure, the full order matrix was determined and analyzed in detail for each optical isomer of the molecule. It is shown that the spectral discrimination of the enantiomers in this lyotropic medium arises mainly from the difference in their average molecular orientation and the principal axis systems of orientation are compared.

No abstract

Abstract-The NMR spectrum of acetone oriented in the nematic phase of butyl-p-@'-ethoxyphenyloxycarbonyl) phenyl carbonate has been studied in the 48" to 58°C temperature range. The determination of direct coupling constants allows the computation of orientation parameters; these values lead us to emphasize the intervention of polarizability in orientatior. phenomena. (Fig. 1). (Fig. 2); ya est le rapport gyromagnitique du proton; le symbole ( ) indique qu'il s'agit d'une valeur moyenne, la moltcule n'ttant pas rigide. 533

No abstract