3种氨基酸锌配合物在水中的溶解焓  

The enthalpies of solution of complexes of zinc with three amino acids in water

作　　者：王小芳[1] 王芳[1] 高胜利[1] 

机构地区：[1]西北大学化学系陕西省物理无机化学重点实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2004年第3期294-296,共3页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(20171023);陕西省教育厅专项科研计划基金资助项目(00JK158)

摘　　要：目的　测定锌与α Leu,α Val,α Thr3种配合物于298 15K时在水中的溶解焓。方法　用微量热计,在平衡后记录溶液热效应曲线,计算其溶解焓。然后依据盖斯定律,计算出Zn(AA)2+(aq,∞)的标准生成焓。结果　Zn(Leu)2+(aq),Zn(Val)2+(aq)和Zn(Thr)2+(aq)在298.15K时的溶解焓分别是(3.17±0.09),(28.46±0.08)及(16.18±0.09)kJ/mol。Zn(AA)2+(aq,∞)的标准生成焓分别是(-1088.26±4.28),(-569.71±3.84)和(955.24±5.70)kJ/mol。结论　所用微量热计测定的结果准确可靠。AimTo measure the enthalipies of solution of complexes of zinc with L-α-Leucine,L-α-Valine and L-α-Threonine in water at 298K.MethodsMeasuring the curve of heat effect of the mixture of solute and water after thermal equilibrium by using microcalorimeter and calculating the enthalipies of solution according to hess′s law.ResultsThe values of the enthalipies of solution of three complexes are (3.17±0.09)kJ/mol and (28.46±0.08)kJ/mol and (16.18±0.09)kJ/mol respectively. The standard enthalpies of formation of Zn(AA)^(2+)(aq) have been calculated. They are (-1 088.26±4.28)kJ/mol,(-569.71±3.84)kJ/mol and (955.24±5.70) kJ/mol.ConclusionThe microcalorimeter used is accurate and reliable.

关 键 词：锌 氨基酸 溶解焓 

分 类 号：O642.1[理学—物理化学]