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Dielectric Relaxation of Mixtures of N-Methylacetamide and N,N-Dimethylformamide Solved in Benzene Using Microwave Absorption Data

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Dielectric Relaxation of Mixtures of N-Methylacetamide and N,N-Dimethylformamide Solved in Benzene Using Microwave Absorption Data

Raman Kumar, V. S. Rangra, D. R. Sharma, N. Thakur, and N. S. Negi

Electronics Research Laboratory, Physics Department, Himachal Pradesh University, Shimla 171005, India

Reprint requests to Prof. V. S. R.; E-mail: vs rangra@yahoo.co.in Z. Naturforsch. 61a, 197 – 204 (2006); received November 24, 2005

The dielectric relaxation timesτand dipole momentsµof N-methylacetamide (NMA) mixed with N,N-dimethylformamide (DMF) in benzene solutions have been obtained using standard standing wave microwave techniques and Gopala Krishna’s single frequency (9.90 GHz) concentration vari- ational method at 25, 30, 35, and 40◦C. The energy parameters (∆Hε,∆Fε,∆Sε) for the dielectric relaxation process of mixtures with equal amounts of NMA and DMF have been calculated and com- pared with the corresponding energy parameters (∆Hη,∆Fη,∆Sη) for the viscous flow. On the basis of the observations it is found that the dielectric relaxation process can be treated as a rate process like the viscous flow. Solute-solute and solute-solvent types of the molecular associations have been predicted.

Key words: Dielectric Relaxation; Solute-Solute Interaction; Relaxation Times;

Microwave Absorption Studies.

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