DMF－DMSO混合溶剂中多硫离子化学平衡的研究

Studies on Chemical Equilibriums of Polysulfide Ions in DMF-DMSO Mixed SOlvent

采用分光光度法研究在二甲基甲酰胺（ＤＭＦ）和二甲亚砜（ＤＭＳＯ）混合溶剂中的多硫离子平衡表明，无论在Ｚ＝２或８／３的溶液中，当表现浓度减小时，都有利于多硫离子的降解。并且溶液中多硫离子之间的化学平衡，都随混合溶剂的组成变化，也即和介电常数有关．低介电常数有利于低聚合度的多硫自由基离子的存在．

s Studies on the equilibriums of polysulfide ions in DMF-DMSO mixedsolvent by spectrometric method have been made and it has been shown that the decom-position of polysulfide ions is favourable when apparent concentrations are decreased ei-ther in the solution Z=2 or Z=8/3. Besides, the chemical equilibriums among polysul-fide ions vary with the composition of the mixed solvent,e.g.,with the dielectric con-stant of the solvent.A lower value of dielectric constant is favourable to the existence ofpolysulfide radical ions in a lower degree of polymerization.