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Issue 16, 2009
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The characterisation and catalytic properties of biomimetic metal–peptide complexes immobilised on mesoporous silica

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Abstract

The active core of the enzyme methane mono-oxygenase (MMO) contains an iron (or copper) dimer with histidine and glutamic acid ligands located on a His-x-x-Glu sequence of the peptide chain. We mimicked the active core of MMO by immobilising the His-Gly-Gly-Glu motif on a silica support, using the methods of solid phase peptide synthesis, and by allowing complexes with Cu and Fe cations to self-assemble. The dominating mode of coordination in the complexes was elucidated by a group fitting analysis of the extended X-ray absorption fine structure (EXAFS) spectra. The complexation of the metal cations by the short peptide significantly changed (improved) their catalytic properties in the oxidation of cyclohexane by H2O2 or by 3-chloro-perbenzoic acid.

Graphical abstract: The characterisation and catalytic properties of biomimetic metal–peptide complexes immobilised on mesoporous silica

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Article information


Submitted
04 Nov 2008
Accepted
14 Jan 2009
First published
12 Feb 2009

Phys. Chem. Chem. Phys., 2009,11, 2928-2938
Article type
Paper

The characterisation and catalytic properties of biomimetic metal–peptide complexes immobilised on mesoporous silica

G. D. Pirngruber, L. Frunz and M. Lüchinger, Phys. Chem. Chem. Phys., 2009, 11, 2928
DOI: 10.1039/B819678H

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