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Zeolite-encapsulated 2-(o-aminophenyl)benzimidazole complexes: synthesis, characterization and catalytic activity

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Abstract

Cobalt(II), copper(II) and zinc(II) complexes of 2-(o-aminophenyl)benzimidazole (AmPhBzlH) encapsulated in the super cages of zeolite-Y and ZSM-5 have been synthesized and characterized by spectroscopic studies (IR, UV/visible, EPR), elemental analyses, thermal studies and X-ray diffraction patterns. The catalytic activity of encapsulated complexes was investigated for the hydroxylation of phenol using 30% H2O2 as an oxidant. Under optimized reaction conditions, the hydroxylation of phenol yielded catechol and hydroquinone as the major products. All catalysts show good selectivity for diphenol products. A maximum conversion of phenol was obtained with [Cu(AmPhBzlH)]-Y as the catalyst. The results showed that conversion of phenol varies in the order [Cu(AmPhBzlH)]-Y > [Cu(AmPhBzlH)]-ZSM-5 > [Zn(AmPhBzlH)]-Y > [Co(AmPhBzlH)]-Y > [Zn(AmPhBzlH)]-ZSM-5 > [Co(AmPhBzlH)]-ZSM-5 after 6 h of reaction time. Test for the recyclability of the reaction was also carried out and the results indicate their recyclability.

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Acknowledgments

The authors gratefully acknowledge the support received from Bangalore University, Bangalore for carrying out this work and BIT, Bangalore, SAIF, Kochi, Kerala, SAIF, IIT, Bombay and Department of physics, IISc, Bangalore for the analysis.

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  1. Department of Studies in Chemistry, Central College Campus, Bangalore University, Bangalore, 560001, India

    B. P. Nethravathi, K. N. Mahendra & K. Rama Krishna Reddy

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  1. B. P. Nethravathi
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Correspondence to K. N. Mahendra.

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Nethravathi, B.P., Mahendra, K.N. & Reddy, K.R.K. Zeolite-encapsulated 2-(o-aminophenyl)benzimidazole complexes: synthesis, characterization and catalytic activity. J Porous Mater 18, 389–397 (2011). https://doi.org/10.1007/s10934-010-9389-x

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