Crystal Structure and Magnetism of Two Isomorphic Complexes Based on Mixed Ligands

doi:10.16553/j.cnki.issn1000-985x.2024.0244

Abstract

Abstract: 3,6-di(2-pyridyl)-1,2,4,5-tetrazine (DPTZ) and 4,4’-oxybisbenzoic acid (H₂OBA) were used as mixed ligands to react with Co(II) ions and Cd(II) ions under solvothermal conditions, resulting in the formation of the complexes[Co(OBA)(DPTZ)]·(DMF)_0.5 (1) and [Cd(OBA)(DPTZ)]·(DMF)_1.5 (2). The structural characterization and analysis of the complexes were conducted through single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, and thermogravimetric analysis. Crystallographic data reveals that complexes 1 and 2 are isostructural, belonging to the monoclinic system with the space group of P2₁/c with each asymmetric unit consisting of onemetal ion (Co/Cd), one 3,6-di(2-pyridyl)-1,2,4,5-tetrazine ligand and one 4,4’-oxybisbenzoic acid ligand. The central metal ion (Co/Cd) has a distorted octahedral configuration, and two adjacent metal ions (Co/Cd) are connected by carboxylic acid ligands, forming a dinuclear pinwheel secondary structural unit. The dinuclear pinwheel secondary structural units are connected by OBA and DPTZ ligands, resulting in an infinitely extended 2D wave-like layer. The existence of the V-shaped ligand OBA as a flexible component within the structure gives rise to both left-handed and right-handed helical chains and helical channels. Furthermore, the magnetic measurement result shows that intramolecular antiferromagnetic interaction is observed in complex 1.

Key words: Co(II) complex, Cd(II) complex, mixed ligand, solvothermal, crystal structure, magnetism, helical chain

CLC Number:

O641.4

LI Jia, FENG Jing, MIAO Meng. Crystal Structure and Magnetism of Two Isomorphic Complexes Based on Mixed Ligands[J]. Journal of Synthetic Crystals, 2025, 54(4): 693-699.

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