Complexes of Manganese, Cobalt and Zinc with Dibasic Organic Acids in Aqueous, Ethanol-Water and Acetone-Water Solutions

[摘要] Solutions of Mn++, Co++ and Zn++ were mixed with various dibasic organic acids in the presence of cation exchange resin at room temperature. The distribution ratios of the metal ions between resin and solution were measured, using radioactive metal ions as tracer. From the observed variation of the distribution ratios with acid anion concentrations, it was concluded that Mn++, Co++ and Zn++ formed one-to-one complexes with succinate, malonate, o-phthalate and tartrate ions in aqueous, 20 % ethanol-water and 20 % acetone-water solutions. The results of the present investigation indicated that the relative stabilities of the complexes increased in the order: Mn++ < Co++ < Zn++ complexes, Succinate < malonate < o-phthalate < tartrate complexes, Aqueous < mixed solvent systems.

[学科分类] 化学（综合）