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

Abstract

A new polyoxomolybdate, [(C₆H₁₂N₄-CH₃)₂Na₂(H₂O)₈](C₆H₁₂N₄-CH₃)₂[(H_0.5)N(CH₂O)₃FeMo₆O_18.5(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 FTIR and EDX analysis. Each unit cell of 1 contains one cation [(C₆H₁₂N₄-CH₃)₂Na₂(H₂O)₈]⁴⁺ and two hexamethylenetetramine cations (C₆H₁₂N₄-CH₃)⁺, and two polyanions [(H_0.5)N(CH₂O)₃FeMo₆O_18.5(OH)_2.5]^3– with ten water molecules in the crystal lattice. In the polyanion, molybdenum ions 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 polyanion 1 is 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. Additional investigations reveal this catalytic system can be refreshed and utilized for up to six successive applications.

KEYWORDS:

• Polyoxomolybdate
• iron
• catalytic reactivity
• 1,2,3-triazole

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Funding

The authors are grateful to the University of Tabriz for financial support of this work.