Synthesis of metal coordination compounds containing benzimidazole tripod ligand and their adsorption properties for iodine
Two novel metal coordination compounds[Co3(L1)2Cl6]n(1)and {[Cu(L1)(SO4)]·2CH3OH}n(2),where L1=2,2',2"-tri(1-benzimidazolyl)ethylamine,have been synthesized by solvothermal method.L1 is a neutral benzimid-azole tripod ligand.Single crystal X-ray diffraction analysis shows that compound 1 is a 1D chain structure and com-pound 2 is a 3D structure.The purity of compounds 1 and 2 was characterized by infrared spectroscopy and powder X-ray diffraction.Thermogravimetric analysis shows that compounds 1 and 2 are heat-resistant materials.The iodine adsorption experiments show that they have high performance of capturing iodine in cyclohexane solution and gaseous iodine and have good recycling ability.At the same time,their adsorption kinetics are most suitable for the quasi-second-order model,and the adsorption process is mainly chemisorption.According to the adsorption mecha-nism,the structures of the compounds contain active groups such as benzene and N heterocyclic ring,which indi-rectly increases the adsorption site with iodine and the chemical reactivity with iodine,improving the removal rate of iodine.CCDC:2288280,1;2288281,2.
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