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Preparation and characterisation of Histidine- and Iron-Histidine-a-Zirconium Phosphate intercalation compounds. Catalytic behaviour of the Iron derivates in oxidation reactions with H2O2 (Articolo in rivista)

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Preparation and characterisation of Histidine- and Iron-Histidine-a-Zirconium Phosphate intercalation compounds. Catalytic behaviour of the Iron derivates in oxidation reactions with H2O2 (Articolo in rivista) (literal)

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Dragone R., Galli P., Massucci M.A., Trombetta M. (2003)
Preparation and characterisation of Histidine- and Iron-Histidine-a-Zirconium Phosphate intercalation compounds. Catalytic behaviour of the Iron derivates in oxidation reactions with H2O2
in Journal of materials chemistry (Print)
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Layered a-zirconium phosphate can be easily chemically manipulated under mild conditions and, by only exploiting its ion-exchange and intercalation properties, it offers the possibility of preparing a great variety of materials that have applications in different fields such as catalysis, ion and molecular sieving, gas sensor, etc. A noticeable amount of the amino acid histidine can be intercalated between the layers of a-zirconium phosphate, at room temperature. The material, briefly formulated as ZrPH2-(His)1.2, exchanges iron(II) and iron (III) ions and, notwithstanding a partial elution of the amino acid, 1:1 iron (II)- or iron(III)-His coordination compounds are formed in situ in the interlayer region. They are employed as \"heterogeneous\" catalysts, at room temperature, in the oxidation of organic substrates, also with Fenton's system. (literal)

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Dragone R.: CNR-IMIP sez. MICE c/o Dipartimento di Chimica Università \"La Sapienza\", Roma Galli P., Massucci M.A.: Dipartimento di Chimica, Università \"Sapienza\", Roma Trombetta M.: Lab. Biomateriali, Università Campuo Bio-Medico, Roma (literal)

Titolo

Preparation and characterisation of Histidine- and Iron-Histidine-a-Zirconium Phosphate intercalation compounds. Catalytic behaviour of the Iron derivates in oxidation reactions with H2O2 (literal)

Abstract

The amino acid histidine (His) easily diffuses into layered a-zirconium phosphate if the layers are first preswelled via preparation of a metastable ethanol intercalate a-Zr(HPO4)2x2EtOH. Different materials are obtained by varying the contact time and His solution concentration. A new compound of composition a-Zr(HPO4)2His1.2x5H2O has been selected for its higher His content and remarkable interlayer spacing of 18.4 Å. The FT-IR spectra of this compound show that His interacts with the P-OH groups of the host through the NH2 primary group of the amino acid. Zr(HPO4)2His1.2x5H2O takes up Fe(II) and Fe(III) ions from the respective iron sulphate solutions by ion-exchange. This process, accompanied by a partial release of His to the contact solutions, gives rise to intercalates in which the metal-ion:His molar ratios are close to 1:1. The reflectance spectra account for the presence, in the interlayer region, of the Fe(n+):His = 1:1 coordinated species. The iron-histidine intercalation compounds have been tested as catalysts in the oxidation reaction of an organic substrate, Indigo-Carmine, by H2O2 and the results compared with those obtained with the H2O2 solution alone, with Fenton's and Ruff's reagents (a H2O2 aqueous solution containing respectively iron(II) or iron(III) ions as catalysts) or with H2O2 solutions containing Fe(n+)-His (1:1) complex species. The solid catalysts, recovered after reaction, have been re-used for further runs. (literal)

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