Dielectric Research Laboratory, Department of Physics, J.N.V. University, Jodhpur 342005, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Nov;82(1):279-82. doi: 10.1016/j.saa.2011.07.049. Epub 2011 Jul 23.
The dielectric dispersion and absorption spectra of formamide (FA), N,N-dimethylformamide (DMF) and their binary mixtures are investigated in the frequency range of 500 MHz to 20 GHz at 30°C in view of the organic synthesis by microwaves heating using amides solvents. The concentration dependent values of molecular reorientation relaxation times lower than that of the ideal mixing behaviour have been attributed to the cooperative dynamics of H-bonded FA-DMF structures. The molar ratio of stable adduct is 2:1 of FA to the DMF, which is determined from the concentration dependent excess static dielectric constant and the relaxation time plots of these binary mixtures. Electrode polarization effect and ionic conduction in FA and DMF were investigated from their dielectric dispersion spectra in the low frequency region of 20 Hz to 1 MHz.
在 30°C 下，我们研究了甲酰胺 (FA)、N,N-二甲基甲酰胺 (DMF) 及其二元混合物在 500MHz 至 20GHz 频率范围内的介电色散和吸收光谱，以期通过酰胺溶剂的微波加热进行有机合成。低于理想混合行为的分子重定向弛豫时间的浓度相关值归因于氢键 FA-DMF 结构的协同动力学。从这些二元混合物的浓度相关过剩静态介电常数和弛豫时间图确定了稳定加合物的摩尔比为 FA 与 DMF 的 2:1。在 20Hz 至 1MHz 的低频区，从介电色散光谱研究了 FA 和 DMF 中的电极极化效应和离子传导。
