Co(Ⅱ),Ni(Ⅱ)和Cu(Ⅱ)与L-多巴和1,10-菲咯啉在低介电介质中三元配合物体系的化学物种(英文)

Chemical Speciation of Ternary Complexes of Co(Ⅱ),Ni(Ⅱ) and Cu(Ⅱ) with L-Dopa and 1,10-Phenanthroline in Low Dielectric Media

对M髤[M=Co,Ni and Cu]与L-多巴（L）和1,10-菲咯啉（X）在的1,4-二氧杂环己烷（DOX）-水混合物【0~60%（V/V）】三元配合物体系在（303.0±0.1）K和离子强度为0.16 mol.L-1情况下进行pH滴定。结果表明：对Co髤和Cu髤而言,三元物种为MLX2H,MLXH,ML2X和MLX,但对Ni髤而言,三元物种为MLX2H,MLXH和MLX。三元物种的稳定性和浓度随介质的介电常数的变化趋势根据静电和非静电力作出解释。同时还给出了物种在不同pH值的DOX-水混合物中的分布图。根据滴定曲线推论了各种二元和三元配合物的生成。用两种方法解释了三元配合物比对应的二元配合物稳定的原因。

Chemical speciation of ternary systems of M（II） [M=Co, Ni and Cu] with L-Dopa （L） and 1, 10- Phenanthroline （X） in 0-60% （V/V） 1, 4-Dioxane （DOX）-water mixtures has been studied pH-metrically at a temperature of （303.0＋0.1） K and an ionic strength of 0.16 mol＇L-1. The ternary species confirmed are MLX2H, MLXH, MInX and MLX for Co（lI） and Cu（ll） and MLX2H, MLXH and MLX for Ni（lI）. The trend in the variation of stability and concentrations of the ternary species with the dielectric constant of the medium was explained on the basis of electrostatic and non-electrostatic forces. Distribution of the species with pH value at different compositions of DOX-water mixtures was also presented, The formation of various binary and ternary complexes has been inferred from the corresponding titration curves. The extra stability of ternary complexes compared to their binary analogues is explained based on two approaches.