有机锡（IV）与维生素B6配合物的平衡研究
Equilibrium studies of organotin(IV) complexes with vitamin B(6).
作者信息
Shoukry M M, Khairy E M, Mohamed M M
机构信息
Department of Chemistry, Faculty of Science, Cairo University, Giza, Cairo, Egypt.
出版信息
Talanta. 1997 Jul;44(7):1149-57. doi: 10.1016/s0039-9140(96)02113-3.
The complex-formation equilibria of dimethyltin(IV), trimethyltin(IV) and tributyltin(IV) with pyridoxamine were investigated in dioxane-water mixtures and at different temperatures using a potentiometric technique. The stepwise formation constants of the complexes formed in solution were calculated using the non-linear least-square program MINIQUAD-75. The effect of dioxane as a solvent on the protonation constants of pyridoxamine and the formation constants of organotin(IV) complexes was discussed. The thermodynamic parameters DeltaH degrees and DeltaS degrees calculated from the temperature dependence of the equilibrium constants were investigated. The concentration distribution of the various complex species was evaluated as a function of pH.
采用电位滴定技术，在二氧六环 - 水混合溶剂中及不同温度下，研究了二甲基锡（IV）、三甲基锡（IV）和三丁基锡（IV）与吡哆胺的络合形成平衡。使用非线性最小二乘法程序MINIQUAD - 75计算溶液中形成的络合物的逐级形成常数。讨论了二氧六环作为溶剂对吡哆胺质子化常数和有机锡（IV）络合物形成常数的影响。研究了根据平衡常数的温度依赖性计算得到的热力学参数ΔH°和ΔS°。评估了各种络合物物种的浓度分布随pH值的变化情况。
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