An electron resonance study of molecular motion in liquido-terphenyl

In the solution electron resonance spectrum of vanadyl acetylacetonate both the line positions and their widths depend on the nature of the solvent. This dependence has been used to investigate the structure of liquid o-terphenyl whose high viscosity, near the freezing point, has been attributed either to molecular asymmetry or to the presence of rigid clusters. A detailed theoretical and experimental analysis of the linewidth coefficients supports the former model but cannot exclude the latter.