Catalysis Database

EPR spectroscopy of copper and manganese complexes encapsulated in zeolites

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

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Abstract

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
Subjects:Science > Chemistry
ID Code:605
Deposited By:Dr S Navaladian
Deposited On:08 Apr 2007 01:24
Last Modified:08 Apr 2007 01:24

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