Isotope effects on the degree of order and the deuterium quadrupole coupling constants, as measured by N.M.R. of oriented benzene-d1, 1,4-benzene-d2and 1,3,5-benzene-d3

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Abstract
Proton and deuteron magnetic resonance spectra of benzene-d 1, 1,4-benzene-d 2 and 1,3,5-benzene-d 3, oriented in various liquid crystal solvents have been analysed. Isotope effects on the degree of order have been measured. The ratios of S-values in the benzene plane are found to be Sxx/Szz =1·0201 ± 0·0009 in benzene-d 1 and 1·0389 ± 0·0004 in 1,4-benzene-d 2 with the deuterons substituted on the z-axis. Deuteron quadrupole coupling constants of 190·4 ± 1·2 kHz and 192·4 ± 1·2 kHz have been obtained for 1,4-benzene-d 2 and 1,3,5-benzene-d 3.