基于吡啶取代的三唑苯甲酸酯配体的1D过渡金属配合物

1D Transition-metal Coordination Polymers Based on Pyridinesubstituted Triazole Benzoate Ligands

采用4-[3-甲基-5-(吡啶-4-基)-1,2,4-三唑-4-基]苯甲酸(HL1)和3-乙酰氨基-5-(3-甲基-5-(吡啶-4-基)-4H-1,2,4-三唑-4-基)苯甲酸(HL2)配体经溶剂热法制备了3个新颖的过渡金属配合物[Cu(L1)]n·4nH2O(1),[Zn(L2)2]n·3nH2O(2),[Co(L2)2]n·nH2O(3).对配合物进行了粉末衍射(XRD)、磁性和荧光性质研究.配合物1-3均为一维过渡金属配合物.在配合物1中,配体L1−呈现μ3-桥联配位模式.在配合物2和3中,配体L2−呈现两种μ2-桥联配位模式.与自由配体相比,配合物1和2的室温固态荧光光谱中可见光区出现弱的发射峰.磁学性质研究发现,配合物3在2-80 K没有观察到ZFC和FC曲线的可逆点,表明3不是磁体.

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 theμ3-bridging coordination mode,and ligand L2−presents twoμ2-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.