Study of Intermolecular Interaction of Ethanol -N Methyl Acetamide Binary Mixture at High Frequency

Dielectric Behavior of N-methyl Acetamide [C3H7NO] – Ethanol [C2H5OH] binary mixture at different temperatures 15, 25, 35 and 450c have been determined over frequency range of 10 MHz to 20 GHz. Using the Time Domain Reflectometry Technique in reflection mode for 11 different concentrations of given binary system has been used to measure reflection coefficient. Further Fourier transform and least square fit method have been used to obtain dielectric parameters such as dielectric constant (0) and relaxation time (). The dielectric constant decreased with an increase in temperature where as it increased with increase in concentration of NMA in Ethanol. Relaxation time decreased with an increase in temperature and increases with the concentration of NMA in Ethanol. By using dielectric parameters excess permittivity (E) has negative values for all concentrations and temperature indicates that total effective dipoles are decreases in the mixture. excess inverse relaxation time (1/)E has positive values in ethanol reach region which indicates that formation of cooperative field to rotate dipole faster, while negative in NMA reach region which indicates the formation of linear structure (non cooperative field) results the slower rotation of dipoles. Kirkwood factor (geff) gf, Bj coefficient and thermodynamic parameters give systematic behavior of solute solvent for different concentrations and temperature at high frequency.