四苯硼钾从水到水——二氧六环混合溶剂中的标准迁移自由能和介质效应  

Standard Gibbs Energy of Transfer of Potassium Tetraphenylborate from Water to Dioxane Mixed Solvents and the Primary Medium Effect

作　　者：郭永卫[1] 于玲 王晓玲[3] 

机构地区：[1]烟台教育学院生化系,山东烟台264001 [2]山东莘县师范学校,山东莘县252400 [3]烟台师范学院化学系,山东烟台264025

出　　处：《济南大学学报（自然科学版）》2005年第2期154-157,共4页Journal of University of Jinan(Science and Technology)

摘　　要：在温度298.15K时,用光度法测定了四苯硼钾在水及不同比例的水-二氧六环(DEDO)混合溶剂中的溶解度,进而对四苯硼钾从H2O到H2O-DEDO混合溶剂中的标准迁移自由能和介质效应进行了研究。结果表明,随物质的质量分数x(DEDO)的增大,ΔG0t呈现复杂的变化,当x<0.2,-ΔG0t随x的增大而增加;当x>0.2,-ΔG0t随x的增大而减小,在x=0.2附近,-ΔG0t出现极大值。当x>0.8时,ΔG0t变为正值,且随x的增大而急剧增加。对出现这种变化规律的原因进行了分析讨论。The solubilities of potassium tetraphenylborate (KBPh_4) in water and water-dioxane mixed solvents at 298.15?K have been determined by spectrophotomentry. The standard Gibbs energies of transfer (ΔG0璽) of KBPh_4 from H_2O to H_2O-DEDO mixtures and the primary medium effect of KBPh_4 at 298.15?K were studied. The results show that ΔG0_t exhibits a complicated variation pattern with the increase of the fraction of DEDO at 298.15?K.When x<0.2,-ΔG0_t increases with x,and the-ΔG0_t decreases with increasing x when x>0.2. The-ΔG0_t exhibits a maximum value near x=0.2.When x>0.8, the ΔG0_t becomes positive , and increases sharply with x.The main reason for this change was analyzed and discussed.

关 键 词：四苯硼钾 二氧六环 溶解度 活度系数 迁移自由能 介质效应 

分 类 号：O64[理学—物理化学]