Synthesis, Structure and Characterization of Co(Ⅲ)/Cu(Ⅱ) Complexes Based on Organic Carboxylic Acid Ligands

Abstract

Abstract: Two novel complexes, namely [Co(L′)₃] (1) and [Cu(L′)₂]_n (2) (HL′=5-bromopyridine-2-carboxylic acid), were obtained under solvothermal conditions by the assembly process of organic carboxylate ligand containing halogen (3-bromopyridine-2,6-dicarboxylic acid, H₂L) and Co(NO₃)₂·6H₂O or Cu(NO₃)₂·3H₂O respectively, and characterized by element analysis (EA), X-ray single diffraction (SXRD), X-ray powder diffraction (PXRD), infrared spectroscopy (IR) and thermogravimetric analysis (TGA). The single crystal X-ray diffraction reveals that ligand H₂L transform to HL′ during a decarboxylation process. In the asymmetric unit of 1, there are two mononuclear units. In each unit, central Co(Ⅲ) ion is in a slightly distorted octahedron. Complex 1 shows mononuclear structure, forming a three-dimensional (3D) supramolecular structure via C—H…O hydrogen bonding interactions. The asymmetric unit of 2 contains one central Cu atom and two L′^- ligands. In each unit, central Cu(Ⅱ) ion is in a slightly distorted octahedron. Complex 2 exhibits 1D chain structure, forming a three-dimensional (3D) supramolecular structure via C—H…O hydrogen bonding interactions. Furthermore, the stability property of complexes 1 and 2 was also investigated.

Key words: solvothermal synthesis, organic carboxylic acid ligand, Co complex, Cu complex, crystal structure, decarboxylation

CLC Number:

O641.4

BAO Yuting, LI Haichao, MA Qin, SUN Zan. Synthesis, Structure and Characterization of Co(Ⅲ)/Cu(Ⅱ) Complexes Based on Organic Carboxylic Acid Ligands[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(11): 2129-2137.

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