Synthesis and characterization a new polyoxomolybdate C34H114Fe2Mo12N18Na2O66 and study of its catalytic activity in the production of 1,2,3-triazoles

Abstract

AbstractA new polyoxomolybdate with a formula of [(C6H12N4-CH3)2Na2(H2O)8](C6H12N4-CH3)2[(H0.5)N(CH2O)3FeMoO18.5(OH)2.5]2·10H2O(1)was synthesized. The structure of the synthesized polyoxomolybdate was investigated by single crystal X-ray diffraction analysis and several other identification techniques such as FT-IR and EDX analysis. It was confirmed that each unit cell of1contains one cation [(C6H12N4-CH3)2Na2(H2O)8]4+and two hexamethylenetetramine cations (C6H12N4-CH3)+, two polyanions [(H0.5)N(CH2O)3FeMoO18.5(OH)2.5]3-with ten water molecules in the crystal lattice. In polyanion, molybdenum metals are bonded to two terminal oxygen atoms and two μ2- (Mo-Mo) and μ3- (Mo-Fe-Mo) bridging oxygen atoms. Iron in the center of the polyanion1is also surrounded by three deprotonated oxygens of trimethanolamine ligand and three μ3- (Mo-Fe-Mo) bridging oxygen atoms. This new polyoxomolybdate was used as an efficient catalyst in the azide-alkyne cycloaddition reaction to produce various 1,2,3-triazoles with high yields.