*(
) of 1,2-ethanediol over the temperature range 161–453 K and the frequency range 0.1 Hz–150 GHz were analyzed using the Dissado–Hill cluster model. The
relaxation frequency
p = 
and intra- (nDH) and intercluster (mDH) correlation parameters were calculated. The energy barrier to the libration of molecular axes in clusters was found to be BDH = 2.96 kJ/mol. The apparent
enthalpy of activation was determined; it increased from
= 22.18 kJ/mol to 
= 129.19 kJ/mol close to the glass transition temperature. The mean dipole moments
of 1,2-ethanediol clusters were calcu-lated; they decreased from 162 920 to 18.08 D as the temperature increased from 161 to 453 K. According to
approximate estimates, the number of 1,2-ethanediol molecules in a cluster
/
v decreased from 72 405 at 161K to 8.04 at 453 K (
v is the dipole moment of the molecule in the vacuum), which substantiated the sug-gestion of the existence of a spatial structure close to the boiling point.