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Issue 4, 2013
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Alizarin complexone: an interesting ligand for designing TiO2-hybrid nanostructures

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Abstract

Herein we report the characterization and photoelectrochemical behavior of nanocrystalline TiO2 films modified with some alizarin derivatives. Particularly, alizarin complexone (3-[N,N-bis(carboxymethyl)-aminomethyl]-1,2-dihydroxyanthraquinone) and its Fe(II) and Fe(III) metal complexes have been examined. Based on UV-Visible and Raman spectroscopic studies we proposed that AC forms a tridentate complex with titanium dioxide involving the 2-OH and (methylimino) diacetate groups, while Fe(II) and Fe(III) AC-complexes bind to titanium dioxide through the carbonyl (C[double bond, length as m-dash]O) and hydroxyl (OH) groups at the 1,9 positions of the alizarin framework. These findings allow the design of different nanostructures with diverse photoelectrochemical behavior. Analysis of the jV curves reveals a sign reversal at −90 mV and −100 mV upon the excitation of AC@TiO2 and [FeIIIAC]@TiO2 photoelectrodes, respectively, whereas [FeIIAC]@TiO2 displays only anodic photocurrents. A description involving both electronic and geometric factors to account for these differences is proposed.

Graphical abstract: Alizarin complexone: an interesting ligand for designing TiO2-hybrid nanostructures

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Publication details

The article was received on 29 Oct 2012, accepted on 11 Jan 2013 and first published on 14 Jan 2013


Article type: Paper
DOI: 10.1039/C3NJ40979A
New J. Chem., 2013,37, 969-976

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    Alizarin complexone: an interesting ligand for designing TiO2-hybrid nanostructures

    Y. Di Iorio, R. Parra, K. Szaciłowski and M. A. Grela, New J. Chem., 2013, 37, 969
    DOI: 10.1039/C3NJ40979A

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