Synthesis, Crystal Structure of [Cu(SO₄)(CH₅N₃O)₂] and [Co(SO₄)(C₂H₅N₃O)₂]ₙ, and Studies of Intermolecular Interactions

The interaction of semicarbazide with transition metal salts in the presence of additional ligands resulted in the formation of two coordination compounds, [Co(SO₄)(C₂H₅N₃O)₂]ₙ (1) and [Cu(SO₄)(CH₅N₃O)₂] (2). The composition and structure of the compounds were determined by single-crystal X-ray diffraction (XRD) analysis. It was established that the copper complex [Cu(SO₄)(CH₅N₃O)₂], formed by semicarbazide, lactic acid, and the metal salt, is isostructural to the previously synthesized complex [Cu(SO₄)(CH₅N₃O)₂]ₙ. Meanwhile, the cobalt complex [Co(SO₄)(C₂H₅N₃O)₂]ₙ, formed by semicarbazide, monoethanolamine, and the corresponding metal salt, is a 1D polymeric compound in which the polymer units are linked by a bridging ligand (SO₄)²⁻. The coordination geometry of the central atom corresponds to a distorted octahedron and a square pyramid in complexes 1 and 2, respectively. The results obtained expand the understanding of the structural features of semicarbazide coordination compounds and can be utilized in the further study of their physicochemical and functional properties.