Microwave dielectric relaxation studies of hydrogen bonded polar binary mixtures of isobutanol and aniline

► Study of molecular interactions between hydrogen bonded polar liquid systems. ► Polar liquids of isobutanol, aniline and its binary mixtures are considered. ► Dielectric relaxation studies in microwave frequency region at different temperatures ► Conformational analysis from the FT-IR spectrum and quantum mechanical calculations. ► Evaluation of excess dielectric permittivity, g factor and thermodynamic parameters.► Correlation between the obtained experimental and theoretical results are discussed.