1. SYNTHESIS AND STUDY OF MIXED-METAL COMPLEXES OF Mn(II), Co(II), Ni(II), Cu(II), Zn ON BASE OF AMMONIUM VANADATE AND 5-AMINO-2- MERCAPTOBENZYMIDAZOLE.
- Author
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RAXMONOVA, D. S. and KADIROVA, Z. CH.
- Subjects
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METAL complexes , *COMPLEX compounds synthesis , *VANADATES , *THIOL synthesis , *LIGANDS (Chemistry) , *THERMAL analysis - Abstract
Background. The literature data on the synthesis and properties of mixed-metal complexes of 3d metals with ammonium vanadate and 5-amino-2-mercaptobenzimidazole is limited. Thus, the synthesis and study heterometallic compounds allowed elaborating new aspects of coordination chemistry. Purpose. Elaboration of the synthesis method for mixed-metal complexes of Mn (II), Co (II), Ni (II), Cu (II) and Zn nitrates with ammonium vanadate and 5-amino-2-mercaptobenzimidazole (L) and study of their composition and structure with modern physical and chemical methods. Methodology. A technique for synthesis of mixed-metal complex compounds has been elaborated. For their synthesis, an alcoholic solution of the ligand (molar ratio M: M: L=1: 2: 2) was added to solution of ammonium vanadate and metal chlorides, pH 8. The reaction had been carried out at heating for 40 min. The coordinating competitive donor centers, the electronic and geometric structure of the ligand molecule were investigated by quantum-chemical calculations using the DFT / V3LIP / LanL2DZ method in the Gaussian09 software package. The composition and structure of the synthesized mixed-metal complex compounds were investigated by the methods of elemental, thermal analysis and FTIR- spectroscopy. Originality. A procedure has been developed for synthesis of mixed-metal complex compounds: Mn (II), Co (II), Ni (II), Cu (II), Zn nitrates with ammonium vanadate and 5-amino-2-mercaptobenzimidazole. It was found that in complexation reactions the ligand molecule is coordinated through the nitrogen atom with the negative value of the effective partially localized charge. Findings. The data on coordinating competitive donor centers, the electronic and geometric structure of the ligand molecule. [ABSTRACT FROM AUTHOR]
- Published
- 2021