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铬(Ⅲ)离子与反丁烯二酸生成的羟联多核配合物可用作偶联剂,但其在溶液中的状态尚缺乏定量研究。本文用静置平衡pH法在四种不同浓度(0.00175,0.0025,0.00375和0.005mol·dm~(-3))的反丁烯二酸存在下和低铬浓度(0.0025mol·dm~(-3))时,研究了C~(3+)在溶液中的状态,并用Newton-Raphson法和非线性最小平方法计算了在四种反丁烯二酸浓度下[Cr_2OH]~(5+),[Cr_2(OH)A]~(3+)和[Cr_2(OH)A_2]~+的水解常数和形成常数,在四种浓度下所得结果颇为一致。本文的结果对合成偶联剂和解释偶联作用的机理提供了线索。
The hydroxyl-linked polynuclear complex formed by chromium (Ⅲ) ion and fumaric acid can be used as coupling agent, but its status in solution is lack of quantitative research. In this paper, the equilibrium pH was used in the presence of four different concentrations of fumaric acid (0.00175, 0.0025, 0.00375 and 0.005 mol · dm -3) and low chromium concentration (0.0025mol · dm -3 )), The state of C ~ (3+) in solution was studied and the [Cr_2OH] ~ (5+), The hydrolysis constants and formation constants of [Cr 2 (OH) A] ~ (3+) and [Cr 2 (OH) A 2] ~ + are quite consistent at four concentrations. The results in this paper provide clues for the synthesis of coupling agents and for explaining the mechanism of coupling.