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Copper(II) Complexation with Thiosemicarbazide in Aqueous Solution
Russian Journal of Physical Chemistry A  (IF0.691),  Pub Date : 2021-09-12, DOI: 10.1134/s0036024421090223
Samadov, A. S., Gorichev, I. G., Kaziev, G. Z., Faizullozoda, E. F., Stepnova, A. F.

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 СTsc/\(C_{{{\text{Cu}}}}^{{2 + }}\) ≥ 2.0. In hydrochloric acid, stepwise replacement of ligands occurs according to the equation [CuClx]\(^{{ + 2-x}}\) + iTsc = [CuCl\({{_{x}}_{{-1}}}\)Tsci]\(^{{ + 2-(x-1)}}\) + xCl, βi. 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).