The proton magnetic resonance spectrum of biphenyl has been observed in dilute solution with d-chloroform and tetramethylsilane as the solvents. Theoretical analyses of these spectra were carried out with the aid of additional data provided by several deuterated biphenyls. A limited amount of data was also obtained for p-terphenyl and fluorene to assist in the interpretation. Estimates of the additional anisotropy contributions at each position from the second ring were calculated as a function of the dihedral angle of biphenyl. The results obtained are interpreted assuming a freely rotating model with weak interaction between phenyl rings.
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Mayo et al. (1966) studied this question.
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