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Oxidation of substituted benzyl amines using a phenoxo-bridged dimeric nickel(II) complex: synthesis, crystal structure and catalytic activity

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Abstract

A benzimidazole-based Schiff base ligand and its dinuclear complex [Ni2(L)2(NO3)2] where L = 2-[2-(1H-benzo[d]imidazole-2-yl)ethylimino)methyl] phenol have been synthesized. An X-ray crystallographic study showed that both the metal centers in the complex adopt a distorted octahedral geometry. Variable-temperature magnetic studies suggest that the nickel(II) centers are antiferromagnetically coupled. Cyclic voltammetry confirms that the dinickel complex retains its identity in the presence of tert-butyl hydroperoxide in the solution state. The complex has been used as a catalyst for the homogeneous oxidation of substituted benzyl amines in the presence of tert-butyl hydroperoxide. The yields of these reactions depend upon the nature of the substituent in the aromatic ring.

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Acknowledgments

We gratefully acknowledge University of Delhi for a special research grant. The author (R.K) is thankful to UGC for providing senior research fellowship (SRF) and one of the authors (Pavan Mathur) gratefully acknowledges sabbatical leave from University of Delhi, Delhi, India.

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Authors and Affiliations

  1. Department of Chemistry, University of Delhi, Delhi, 110007, India

    Robin Kumar, Ravinder Kumar, Kuldeep Mahiya & Pavan Mathur

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  1. Robin Kumar
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  2. Ravinder Kumar
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  3. Kuldeep Mahiya
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  4. Pavan Mathur
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Correspondence to Pavan Mathur.

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Kumar, R., Kumar, R., Mahiya, K. et al. Oxidation of substituted benzyl amines using a phenoxo-bridged dimeric nickel(II) complex: synthesis, crystal structure and catalytic activity. Transition Met Chem 40, 189–195 (2015). https://doi.org/10.1007/s11243-014-9905-y

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  • DOI: https://doi.org/10.1007/s11243-014-9905-y

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