四苯硼铵从H_2O到H_2O-TBA的ΔG_t~和介质效应  

Standard Gibbs Energies of Transfer of Ammonium Tetraphenylborate from Water to Water- t- butyl Alcohol Mixed Solvents and the Primary Medium Effect

作　　者：邹立壮[1] 王晓玲[1] 张丕俭[1] 王风阁 周保学 姜惠敏[1] 屈松生[2] 

机构地区：[1]烟台师范学院化学系,烟台264025 [2]武汉大学化学系,武汉430072

出　　处：《物理化学学报》2000年第12期1119-1124,共6页Acta Physico-Chimica Sinica

摘　　要：Solubilities of ammonium tetraphenylborate (NH4BPh4) in water- t- butyl alcohol (TBA) mixed solvents at 283.15,293.15,298.15,303.15 and 308.15 K have been determined by spectrophotometry.The standard Gibbs energy of transfer (Δ G t) of NH4BPh4 from water to H2O- TBA mixtures and the primary medium effect of NH4BPh4 from 283.15 to 308.15 K were studied.The results show that－Δ G t exhibits a complicated variation pattern with the increase in the mole fraction of TBA [x(TBA)] at the same temperature .When x(TBA) < 0.06,－Δ G t increases very slowly with x(TBA),the－Δ G t increases rapidly with x(TBA) when x(TBA) from 0.06 to 0.2.For x(TBA)> 0.2,the－Δ G t decreases with increasing x(TBA).The largest value of －Δ G t occurs at x(TBA) = 0.2.The main reason for this variation was analyzed and discussed.Solubilities of ammonium tetraphenylborate (NH4BPh4) in water- t- butyl alcohol (TBA) mixed solvents at 283.15,293.15,298.15,303.15 and 308.15 K have been determined by spectrophotometry.The standard Gibbs energy of transfer (Δ G t) of NH4BPh4 from water to H2O- TBA mixtures and the primary medium effect of NH4BPh4 from 283.15 to 308.15 K were studied.The results show that－Δ G t exhibits a complicated variation pattern with the increase in the mole fraction of TBA [x(TBA)] at the same temperature .When x(TBA) < 0.06,－Δ G t increases very slowly with x(TBA),the－Δ G t increases rapidly with x(TBA) when x(TBA) from 0.06 to 0.2.For x(TBA)> 0.2,the－Δ G t decreases with increasing x(TBA).The largest value of －Δ G t occurs at x(TBA) = 0.2.The main reason for this variation was analyzed and discussed.

关 键 词：四苯硼铵 水 水醇混合溶剂 迁移自由能 介质效应 

分 类 号：O642[理学—物理化学]