基于吡啶取代的三唑苯甲酸酯配体的1D过渡金属配合物

Three novel transition metal coordination polymers Cu(L₁)]_n·4nH₂O (1) , Zn(L₂)₂]_n·3nH₂O(2) ,Co(L₂)₂]_n·nH₂O (3), (HL₁=4-3-methyl-5-(pyridin-4-yl)-1,2,4-triazol-4-yl]benzoic acid, and HL₂=3-acetamido-5 - (3-methyl-5 - (pyridin-4-yl) - 4H-1, 2, 4-triazol-4-yl)benzoic acid) have been hydrothermal synthesized and characterized by single-crystal X-ray diffraction, optical and magnetic measurements. Compounds 1-3 are described as 1D polymeric chains. In compound 1, ligand L₁? presents the μ₃-bridging coordination mode, and ligand L₂? presents two μ₂-bridging coordination modes in compounds 2 and 3. The room-temperature photoluminescence spectra of 1 and 2 exhibit weak emissions in the visible region than that of the free ligands. The magnetic properties of 3 show typical antiferromagnetic interaction from 62 to 300 K. But no bifurcation of the ZFC and FC curve is observed from 2 to 80 K, which shows that 3 isn’t a magnet.