Interaction of Copper(II) Ions with Certain Oxyacids and Azoles

Abstract

Compounds composed of [Cu(HIm, metIm)2–3L] ∙ nH2O (n = 0, 2) were obtained during the interaction of slightly soluble tartrate and copper(II) salicylate composed of CuL ∙ nH2O (n = 1–2, L2−—Tar2−, Sal2−) with imidazole (HIm) and 2-methylimidazole (metIm). Mono- and bi-ligand salts were analyzed; the process of their thermal decomposition was studied. The solubility constants KS of the CuC4H4O6 ∙ 2H2O tartrate and CuC7H4O3 ∙ H2O salicylate of copper(II) with at ionic strength of 0.3 were determined. The IR spectroscopy method showed the participation in complexation of the nitrogen atom N(3) of imidazole and the oxygen atoms of the carboxyl groups of oxyacids, as well as the hydroxyl group of salicylic acid in the mixed-ligand salts of copper(II). The compositions and stability of the imidazole-tartrate(salicylate) copper(II) complexes in an aqueous solution were determined by performing photometry and spectrophotometry and of the monoligand complexes [CuTar] and [CuSal] were determined by solubility and isomolar series methods.

Keywords

• tartrate and salicylate of copper(II)
• imidazole and 2-methylimidazole
• mixed-ligand complexes
• stability
• solubility