复杂阳离子四苯硼盐由水到水-异丙醇的迁移自由能

TRANSFER GIBBS ENERGY OF COMPLEX TETRAALKYLAMMONIUM TETRAPHENYLBORATE SALTS FROM WATER TO WATER AND 2-PROPANOL SOLVENT MIXTURES

合成了复杂阳离子四苯硼盐四苯硼化二甲基丁基环己基铵、四苯硼化二甲基叔丁基环己基铵 ,用紫外分光光度法测溶解度的方法对其在水 -异丙醇混合溶剂中的活度、缔合度、活度积等溶液热力学函数进行了计算 ,并研究了其由水到水 -异丙醇中的标准迁移自由能 .

Two new compounds cyclohexyl-butyldimethyl-ammoniumtetraphenylborate ([(CH 3) 2CH 3(CH 2) 3NC 6H 11 ]BPh 4) and cyclohexyl-t-butyl-dimethylammoniumtetrophenlyborate ([(CH 3) 2C(CH 3) 3NC 6H 11 ]BPh 4) have been prepared. And their standard transfer gibbs energies (Δ tr G 0) from water to water and 2-propanol solvent mixtures in different proportion were determined from the solubility which were obtained by UV-spectrophotometer at 298.15 K. The different interaction of the two compounds with solvent mixtures is ascribed to their different structure. It can be seen also that the tendency of Δ tr G 0 of the two tetraalkylammonium tetraphenylborate salts from water to water and 2-propanol solvent mixtures are similar with that of Kbph 4 even though their cations are significantly different.