Abstract
Dielectric constants and relaxation times for aqueous solutions of formamide (FMD) and N-methylformamide (NMF) have been determined in the temparature range 5°C to 40°C and frequency range of 10 MHz to 10 GHz using a time domain reflection method. The relaxation behaviour far these system can be described by the Debye model in the temperature range. For temperature range, considered here, the relaxation time of both amide—water systems decreases monotonously towards water relaxation time, whereas, static dielectric constants behave differently in the aqueous solutions of FMD. In case of aqueous FMD solutions, the excess permittivity found to be positive, whereas, in case of aqueous NMF, it is found to be negative. This behaviour can be understood by hydrogen bond with the asymmetry group ▪ in NMF ( --- indicates hydrogen bond).
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