【摘要】 <正> 高效液相色谱技术(HPLC)多年来主要应用于分析化学领域,1980年Moriyasu等人首次用HPLC法研究了螯合物配体交换反应的动力学,尔后一些工作陆续有所报道。本文对广泛用作分析化学试剂、橡胶硫化促进剂与防焦剂、农业抗菌剂的不同烷基取代的荒氨酸镍盐的配体交换反应的平衡与动力学进行了研究。更多还原

【Abstract】 In this article, equilibrium and kinetics of the ligand exchange reaction between a series of N,N-disubstituted dithiocarhamate chelates of Nickel (Ⅱ) ■ have been studied by means of high-performance liquid chromatography in various solvents such as chloroform, dichloromethane, methylbenzene, ethyl acetate and DMF (dimethyl formamide) etc. at 30℃. The activation parameters of two selected reactions with different disubstituted alkyl groups have been determined in toluene. The experimental results indicate that steric effect of the alkyl groups may influence to some extent the rate of ligand exchange. The reactions of ligand exchange conform to an S_N2 mechanism. Statistical factor seems to enter the evaluation of the equilibrium constants. Solvation effect may contribute to the influence of solvents on reaction rate.更多还原