1H and 31P NMR spectra of the phenyl ester of dichlorophosphoric acid in a nematic phase

The ¹H and ³¹P NMR spectra of the phenyl ester of dichlorophosphoric acid dissolved in Merck nematic phase IV have been recorded and analysed. The values of the dipole dipole couplings have been discussed in terms of several different geometric models. Non-planarity of C-1, O, P and the phenyl ring must be assumed in order to account for the results; a twist angle of 49° was found.