Abstract

The complexation of copper(II) with thiosemicarbazide (Tsc) in aqueous solution at t = 25°С (in 0.1 М HClO₄ and 1.0 М HCl) was studied by potentiometry and spectrophotometry. It was found that in 0.1 М HClO₄ and 1.0 М HCl, stable thiosemicarbazide complexes CuTsc\(_{2}^{{2 + }}\) formed at a ratio of С_Tsc/\(C_{{{\text{Cu}}}}^{{2 + }}\) ≥ 2.0. In hydrochloric acid, stepwise replacement of ligands occurs according to the equation [CuCl_x]\(^{{ + 2-x}}\) + iTsc = [CuCl\({{_{x}}_{{-1}}}\)Tsc_i]\(^{{ + 2-(x-1)}}\) + xCl^–, β_i. The stability constants of thiosemicarbazide and chloro thiosemicarbazide copper(II) complexes calculated from spectrophotometric data are \(\log {{\beta }_{1}}\) = 3.96 ± 0.10, \(\log {{\beta }_{2}}\) = 8.01 ± 0.10 (0.1 М HClO₄); \(\log {{\beta }_{1}}\) = 4.19 ± 0.06, \(\log {{\beta }_{2}}\) = 7.87 ± 0.08 (1.0 М HCl).

中文翻译：

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铜 (II) 与氨基硫脲在水溶液中的络合

摘要

通过电位测定法和分光光度法研究了铜 (II) 与氨基硫脲 (Tsc) 在t = 25°С（在 0.1 М HClO ₄和 1.0 М HCl 中）在水溶液中的络合。发现在 0.1 М HClO ₄和 1.0 М HCl 中，稳定的氨基硫脲复合物 CuTsc \(_{2}^{{2 + }}\)以С _Tsc / \(C_{{{\text{铜}}}}^{{2 + }}\) ≥ 2.0。在盐酸中，根据等式 [CuCl _x ] \(^{{ + 2-x}}\) + i Tsc = [CuCl \({{_{x}}_{{-1 }}}\) Tsc _i ] \(^{{ + 2-(x-1)}}\) +x Cl ^– , β _i。由分光光度数据计算得到的氨基硫脲和氯氨基硫脲铜(II)配合物的稳定性常数为\(\log {{\beta }_{1}}\) = 3.96 ± 0.10, \(\log {{\beta }_{ 2}}\) = 8.01 ± 0.10 (0.1 М HClO ₄ ); \(\log {{\beta }_{1}}\) = 4.19 ± 0.06，\(\log {{\beta }_{2}}\) = 7.87 ± 0.08 (1.0 М HCl)。