microdispersion of copper, zinc cementation, maleic acid, energy dispersive spectroscopy, thermogravimetry.


The paper presents the results of a study of the possibility of the formation of maleate π-complexes of atomic copper in an aqueous solution. Taking into account the existing equilibria, the conditions for the synthesis of an organometallic dispersion by cementation with metallic zinc of a CuSO4 solution containing maleic acid have been optimized. The composition of the powders was determined using energy dispersive spectroscopy, thermogravimetry, and complexometry. It was found that at a molar ratio of reagents Zn: Cu2+ < 0.5, only the monovalent copper complex [Cu(C4O4H3)(H2O)] was formed, while at molar ratios Zn : Cu2+ between 0.5 and 1, obtained composite mixtures consisted of [Cu(C4O4H3)(H2O)], H2O (adsorbed), and Cu (metal). The formation of the π-complex of atomic copper [Cu(C4O4H4)] was not recorded. Due to the heterogeneity of the cementation process, the produced composites at Zn : Cu2+  ≥ 0.5 are inhomogeneous. The copper content within samples produced at Zn : Cu2+  = 1 varies widely: from 47 wt. % up to 74 wt. %.

Author Biographies

Viktor F. Vargalyuk, Oles Honchar Dnipro National University

Full Professor, Doctor of Chemical Sciences, Dean of the Faculty of Chemistry

Volodymyr A. Polonskyy , Oles Honchar Dnipro National University

Associate professor, Candidate of Chemical Sciences (PhD)

Yevhen S. Osokin, Oles Honchar Dnipro National University

PhD student

Oleksandr V. Lahuta , Oles Honchar Dnipro National University

PhD student



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Physical and inorganic chemistry