Authors: T.G. Cherkasova, A.I. Egorov

Title of the article: Synthesis and structure of adipinate polymer complexes with transition metals

Year: 2025, Issue: 1, Pages: 54-60

Branch of knowledge: 2.6.8. Technology of rare, scattered and radioactive elements

Index UDK: 541.49; 546.562; 546.732; 546.742

DOI: 10.26730/1999-4125-2025-1-54-60

Abstract: Adipinate polymer complexes [M(A·(H2O)4)]n (M = Co2+ (I) and Ni2+ (II), A = adipate-dianion, (C6H8O4)2–) and [Cu(A)·2H2O]n (III) are synthesized by dissolving transition metal carbonates in an aqueous solution of adipic acid in stoichiometric proportions. The compounds were characterized by single crystal X-ray diffraction analysis and Fourier transform infrared spectroscopy. The crystal data for the compounds are as follows: I) monoclinic system, space group P21/с(14), a = 4.79(2) Å, b = 9.78(4) Å, c = 11.70(5) Å, α = 90.00 °, β = 99.00(10) °, γ = 90.00 °; II) monoclinic system, space group P21/с(14), a = 4.75(2) Å, b = 9.71(5) Å, c = 11.67(6) Å, α = 90.00 ° , β = 90.01(10) °, γ = 90.00 °; III) triclinic system, space group P (2), a = 3.80(4) Å, b = 4.93(5) Å, c = 11.31(12) Å, α = 85.29(3) °, β = 87.55(3) °, γ = 83.32(3) °. Studies using infrared spectroscopy with Fourier transform determined the presence of crystallization water in all compounds. Complexes I and II are elongated linear polymers; the Co(H2O)4 and Ni(H2O)4 units are linked by a carboxyl group at either end with expanded deprotonated adipic acid. The copper atom in complex III is coordinated in octahedral geometry with a carboxylate and a water molecule. The quantitative values ​​of the solubility of the complexes in water were determined, and the chemical stability of the compounds in some organic solvents, acids and alkalis was qualitatively established.

Key words: adipinic acid complex compounds transition metals XRD IR spectroscopy

Receiving date: 22.11.2024

Approval date: 22.01.2025

Publication date: 12.03.2025

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