EPR spectroscopy of copper and manganese complexes encapsulated in zeolites

Bennur, T. H. ; Srinivas, D. ; Ratnasamy, Paul (2001) EPR spectroscopy of copper and manganese complexes encapsulated in zeolites Microporous and Mesoporous Materials, 48 (1-3). pp. 111-118. ISSN 1387-1811

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S13871...

Related URL: http://dx.doi.org/10.1016/S1387-1811(01)00345-6


The structural basis for the enhanced catalytic activities of copper and manganese Schiff base complexes encapsulated in zeolite-Y is investigated by EPR spectroscopy. The study provides an unequivocal evidence for the encapsulation of complexes inside the supercages of zeolite-Y. The EPR spectroscopy distinguishes the encapsulated complexes from the "neat" and surface-adsorbed metal complexes. Neat complexes showed broad EPR spectra corresponding to nearest neighbour spin–spin interactions whereas the zeolite-encapsulated metal complexes showed well resolved metal hyperfine features similar to the spectra in dilute frozen solutions. The spin Hamiltonian parameters reveal a distorted square pyramidal geometry and an increase in the in-plane covalency of metal–ligand bond as a consequence of encapsulation. The observed changes in the molecular electronic structure are correlated to the enhanced catalytic activity of the encapsulated metal complexes.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Zeolite-encapsulated Metal Complexes; Zeozymes; Ship-in-a-bottle Complexes; EPR Spectroscopy; Copper Complexes; Manganese Complexes; Schiff Base Complexes; Structure; Oxidation Catalysts
ID Code:41377
Deposited On:28 May 2011 09:17
Last Modified:17 May 2016 23:08

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