Standard Gibbs energies of transfer of rubidium tetraphenylborate from water to straight-chain n-alkanols

Solubilities of ribidium tetraphenylborate in water,methanol,ethanol,1-propanol,1-butanol,l-pentanol,1-hexanol and 1-octanol at 288.15,298.15,308.15,318.15,328.15 K have been determined by spectrophotometry.The standard Gibbs energy of transfer of ribidium tetraphenylborate from water to straight-chain n-alkanols and the primary medium effect of rubidium tetraphenylborate from 288.15 to 328.15 K have been calculated.Furthermore,the contribution of microscopic interactions to the standard Gibbs energy of transfer of rubidium tetraphenylborate is calculated and discussed.     

四苯硼铵从H2O到H2O-TBA的ΔGΘt和介质效应

Solubilities of ammonium tetraphenylborate (NH4BPh4) in water-t-butyl alcohol (TBA) mixed solvents at 283.15,293.15,298.15,303.15 and 308.15K have been determined by spectrophotometry.The standard Gibbs energy of transfer (ΔGΘt) of NH4BPh4 from water to H2)-TBA mixtures and the primary medium effect of NH4BPh4 from 283.15 to 308.15K were studied.The results show that-ΔGΘt 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,-ΔGΘt increases very slowly with x(TBA),the-ΔGΘt increases rapidly with x(TBA) when x(TBA) from 0.06 to 0.2.For x(TBA)>0.2,the -ΔGΘtdecreases with increasing x(TBA).The largest value of -ΔGΘt occurs at x(TBA)=0.2.The main reason for this variation was analyzed and discussen.     

四苯硼铵从H2O到H2O-TBA的ΔG()t和介质效应

电解质在水和含水混合溶剂间的迁移热力学性质,对于研究解析电解质与溶剂间的相互作用及其变化规律有着重要的作用.因此,长期以来一直受到人们的重视.碱金属及类碱金属四苯硼盐(MBPh4)是典型的大阴离子强电解质,由于其阴离子(BPh－4)具有较强的疏水作用,因此在水与有机混合溶剂中表现出与纯无机盐明显不同的热力学行为.水与叔丁醇(TBA)是一种特殊的混合溶剂,其性质已有很多报导[1－3].许多作者指出,在富水区存在着H2O与TBA分子形成的笼合物,这使该混合溶剂在富水区表现出许多反常特性,如蒸汽压、偏摩尔体积、密度等都出现了极大或极…