Synthesis, Crystal Structure and Properties of Zn/Co Complexes Based on 2, 5-Dibromoterephthalic Acid Ligands

Abstract

Abstract: In our group, the organic compounds 2,5-dibromoterephthalic acid (H₂L₁) and 2,2′-bipyridine (L₂) were used as biligands to react with zinc sulfate heptahydrate (ZnSO₄·7H₂O) and cobalt nitrate hexahydrate (Co(NO₃)₂·6H₂O), respectively, using solvothermal method to obtain a zinc complex [Zn(L₁)(L₂)(H₂O)]_n (1) and a cobalt complex [Co(L₁)(L₂)(H₂O)]_n (2). The structural characterization and properties measurement were performed by single crystal X-ray diffraction, elemental analysis, infrared spectroscopy, ultraviolet spectroscopy, fluorescence spectroscopy, thermogravimetric analysis and other tests. The results show that complex 1 is a monoclinic crystal system with one-dimensional chain structure formed by the coordination of Zn²⁺ linking L^2-₁ and L₂, each chain forming a three-dimensional network structure by regular stacking under intermolecular hydrogen bonding and π…π conjugation. Complex 2 is a triclinic crystal system with Co1 and Co1ⁱ ions linked by carboxylic acid oxygen atoms O4 and O4ⁱ on H₂L₁ to form a bidentate chelated ligand structural unit. A two-dimensional lattice structure is formed with Co²⁺ ligands connecting L^2-₁ and L₂, and the layers are regularly stacked under O—H…O intermolecular hydrogen bonding and van der Waals forces to form a three-dimensional network structure. Both complexes 1 and 2 contain aromatic heterocycles, carboxyl heterocycles and nitrogen heterocycles, they have good fluorescence property and thermal stability, the maximum emission wavelengths of complex 1 and complex 2 are 345 nm and 333 nm, respectively.

Key words: zinc complex, cobalt complex, solvothermal method, 2, 5-dibromoterephthalic acid, crystal structure, fluorescence property, thermal stability

CLC Number:

O641

HUANG Ruiqin, WANG Sheng, LIU Zheng, TANG Qun, WEI Runzhi. Synthesis, Crystal Structure and Properties of Zn/Co Complexes Based on 2, 5-Dibromoterephthalic Acid Ligands[J]. Journal of Synthetic Crystals, 2022, 51(11): 1944-1951.

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