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Unprecedented formation of a μ-oxobridged polymeric copper(II) complex: Evaluation of catalytic activity in synthesis of 5-substituted 1H-tetrazoles.

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Title: Unprecedented formation of a μ-oxobridged polymeric copper(II) complex: Evaluation of catalytic activity in synthesis of 5-substituted 1H-tetrazoles.
Authors: Layek, Samaresh1, Ganguly, Rakesh2, Pathak, Devendra D.1 ddpathak@yahoo.com
Source: Journal of Organometallic Chemistry. Sep2018, Vol. 870, p16-22. 7p.
Subjects: Copper compounds, Metal complexes, Tetrazoles, Catalytic activity, Schiff bases, Chemical synthesis
Abstract: The reaction of CuCl 2 ·2H 2 O with Schiff base ligand, 4-[(2-hydroxy-3-methoxybenzylidene)amino-1,5-dimethyl-2-phenyl-1H-pyrazol-3-one] (hmdpH), in 1:1 molar ratio led to a novel and unprecedented oxo-bridged polymeric copper (II) complex, [Cu( μ -O) (hmdp)] n . The complex was isolated as crystalline solid and characterized by FTIR, UV–visible and EPR spectroscopic techniques. The molecular structure of the complex was also determined by single crystal X-ray diffraction studies. The formation of the complex is unique and unprecedented in the sense that one of the CH 3 group of the 4-aminoantipyrene unit of the Schiff base ligand is oxidized in situ to CH 2 OH, during the complex formation. The catalytic potential of the complex has been demonstrated in the synthesis of a series of 5-substituted 1 H -tetrazoles via [3 + 2]-cycloaddition reactions of substituted benzonitriles and sodium azide in ethylene glycol. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The reaction of CuCl 2 ·2H 2 O with Schiff base ligand, 4-[(2-hydroxy-3-methoxybenzylidene)amino-1,5-dimethyl-2-phenyl-1H-pyrazol-3-one] (hmdpH), in 1:1 molar ratio led to a novel and unprecedented oxo-bridged polymeric copper (II) complex, [Cu( μ -O) (hmdp)] n . The complex was isolated as crystalline solid and characterized by FTIR, UV–visible and EPR spectroscopic techniques. The molecular structure of the complex was also determined by single crystal X-ray diffraction studies. The formation of the complex is unique and unprecedented in the sense that one of the CH 3 group of the 4-aminoantipyrene unit of the Schiff base ligand is oxidized in situ to CH 2 OH, during the complex formation. The catalytic potential of the complex has been demonstrated in the synthesis of a series of 5-substituted 1 H -tetrazoles via [3 + 2]-cycloaddition reactions of substituted benzonitriles and sodium azide in ethylene glycol. [ABSTRACT FROM AUTHOR]
ISSN:0022328X
DOI:10.1016/j.jorganchem.2018.06.004