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Clay intercalated Cu(II) amino acid complexes: synthesis, spectroscopy and catalysis

Published online by Cambridge University Press:  09 July 2018

L. Fu ,
B. M. Weckhuysen ,
A. A. Verberckmoes  and
R. A. Schoonheydt
L. Fu
Affiliation:
Centrum voor Oppervlaktechemie en Katalyse, Departement Interfasechemie, K.U. Leuven, Kardinaal Mercierlaan 92, 3001 Heverlee (Leuven), Belgium
B. M. Weckhuysen
Affiliation:
Centrum voor Oppervlaktechemie en Katalyse, Departement Interfasechemie, K.U. Leuven, Kardinaal Mercierlaan 92, 3001 Heverlee (Leuven), Belgium
A. A. Verberckmoes
Affiliation:
Centrum voor Oppervlaktechemie en Katalyse, Departement Interfasechemie, K.U. Leuven, Kardinaal Mercierlaan 92, 3001 Heverlee (Leuven), Belgium
R. A. Schoonheydt
Affiliation:
Centrum voor Oppervlaktechemie en Katalyse, Departement Interfasechemie, K.U. Leuven, Kardinaal Mercierlaan 92, 3001 Heverlee (Leuven), Belgium
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Abstract

Complexes of Cu(lysine)2+2 and Cu(histidine)2+2 have been intercalated between the layers of saponite clays by a simple cation exchange procedure from aqueous solutions of preformed Cu(amino acid)2-complexes. Successful immobilization was obtained with an amino acid: Cu2+ ratio of 5, and a pH of 10 and 7.3 for lysine and histidine, respectively. The synthesized materials were investigated as powders and as thin films by electron spin resonance (ESR), diffuse reflectance spectroscopy (DRS) and X-ray diffraction (XRD). The light blue clays are characterized by an axially symmetric ESR spectrum with A//= 192 G, g//= 2.23 and g⊥ = 2.07, and a d-d absorption band around 600 nm, due to the intercalated planar Cu2+-complexes. Ammonia interacts reversibly with these intercalated complexes, suggesting the presence of a free coordination site. The novel synthesized materials are active in various oxidation reactions with t-butyl hydroperoxide as oxidant.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 4 , December 1996 , pp. 491 - 500
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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