Dielectric Relaxation Phenomena of Aniline and Substituted Anilines with Acetonitrile Under 9.36 GHz Electric Field

Relaxation times τ and τ due to whole molecular rotation and the flexible parts of the dilute binary (jk) polar solution of three amine(j) and acetonitrile(k) in C6H6 at 30°C are estimated using susceptibility measurement technique under 9.36 GHz electric field. The increasing values of τ signify the increasing acidity of amine (proton donor) in complex systems. But in nitriles with N, N-dimethyl amine systems, the τ values are less than the other amine complexes due to steric hindrance and inductive effect.. The measured relaxation time (τ^' s) and dipole moment (\pmbμ^'s) match well with the reported values establishing the utility of the proposed method. Solute-solvent and solute-solute molecular associations are ascertained in various molecular environments due to different electron affinity of adjacent atoms. Thermodynamic energy parameters are calculated using Eyring rate theory to predict the molecular dynamics of the system.