Crystal structure and properties of the precursor [Ni(H2O)6](HTBA)2·2Н2О and the complexes M(HTBA)2(H2O)2 (M = Ni, Co, Fe)

摘要: Abstract Four new compounds, the discrete complex [Ni(H2O)6](HTBA)2.2Н2О (1) and polymers Ni(H2O)2(HTBA-O,S)2 (2), Co(H2O)2(HTBA-O,S)2 (3) Fe(H2O)2(HTBA-O,S)2 (4) (H2TBA = 2-thiobarbituric acid, C4H4N2O2S), have been synthesized structurally characterized. The structure of 1 has solved by X-ray single-crystal diffraction analysis. Ni(H2O)62+ cation an almost ideal octahedral geometry, there is no coordination Ni(II) HTBA− in 1. Complexes 2–4 characterized powder XRD, TG-DSC FT-IR. In isostructural 2–4, metals are six-coordinated, octahedrons connected μ2-O,S bridging ligands. Each M(II) ions surrounded two water molecules, O-coordinated S-coordinated ions, with all pairs being trans-positions. Hydrogen bonding π–π interactions play important role for construction supramolecular 3D structures 2–4. formation complexes evidenced infrared spectroscopy. thermal decomposition under oxidative conditions divided into three major stages: dehydration, degradation organic moiety transformation inorganic residue.