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Synthesis, structural characterisation, and catalytic activity of Mn(II)–protected amino acid complexes covalently immobilised on chloropropylated silica gel

Paper ID Volume ID Publish Year Pages File Format Full-Text
54345 47006 2015 6 PDF Available
Title
Synthesis, structural characterisation, and catalytic activity of Mn(II)–protected amino acid complexes covalently immobilised on chloropropylated silica gel
Abstract

•Building biomimetic Mn(II)–amino acid complexes over silica gel via covalent grafting.•Structural characterisation of the silica-anchored complexes with a variety of methods.•Testing with a superoxide dismutase biochemical test reaction.•Oxidation of cyclohexane with high epoxide selectivity.

In this work the syntheses, structure, superoxide dismutase (SOD) activity and the catalytic use in the oxidative transformations of cyclohexene of covalently grafted Mn(II)–complexes formed with various C-protected amino acid (l-histidine, l-cysteine and l-cystine) ligands are presented. The structural features of the surface complexes were studied by EPR, X-ray absorption, and mid/far IR spectroscopies. The superoxide dismutase activities of the materials were determined in a biochemical test reaction. The obtained materials were used as catalysts for the oxidation of cyclohexene with peracetic acid in acetone. Covalent grafting and building the complex onto the surface of the chloropropylated silica gel were successful in all cases. It was found that in many instances the structures obtained and the coordinating groups substantially varied upon changing the conditions of the syntheses. All the covalently immobilised Mn(II)–complexes displayed superoxide dismutase activity and could catalyse the oxidation of cyclohexene.

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Keywords
Biomimetic catalysis; Silica immobilised Mn(II)–complexes; EPR; XAS; Superoxide dismutase activity; Cyclohexene oxidation
First Page Preview
Synthesis, structural characterisation, and catalytic activity of Mn(II)–protected amino acid complexes covalently immobilised on chloropropylated silica gel
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 241, Part B, 1 March 2015, Pages 264–269
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis