The geometric and electronic structure of bimetallic oxide clusters is studied as a function of their composition with gas phase vibrational spectroscopy. Infrared multiple photon dissociation spectra of titanium-vanadium oxide cluster anions are measured in the 500 to 1200 wave number range and assigned on the basis of harmonic frequencies calculated using density functional theory. Singly substituted (V2O5)(n-1)(VTiO5)(-) (n=2-4) cluster anions are shown to form polyhedral caged structures similar to those predicted for their isoelectronic counterparts, the neutral (V2O5)(n) clusters. Upon systematic exchange of V by Ti atoms in V4-nTinO10- (n=1-4), the structure does not change. The stress induced by the isomorphous substitution results in an increased number of unpaired electrons (n-1) for the Ti-rich systems, leading to a quartet ground state for Ti4O10-.

Isomorphous substitution in bimetallic oxide clusters / Janssens, E; Santambrogio, Gabriele; Brummer, M; Woste, L; Lievens, P; Sauer, J; Meijer, G; Asmis, Kr. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 96:23(2006), pp. 233401-1-4. [10.1103/PhysRevLett.96.233401]

Isomorphous substitution in bimetallic oxide clusters

SANTAMBROGIO, GABRIELE;
2006

Abstract

The geometric and electronic structure of bimetallic oxide clusters is studied as a function of their composition with gas phase vibrational spectroscopy. Infrared multiple photon dissociation spectra of titanium-vanadium oxide cluster anions are measured in the 500 to 1200 wave number range and assigned on the basis of harmonic frequencies calculated using density functional theory. Singly substituted (V2O5)(n-1)(VTiO5)(-) (n=2-4) cluster anions are shown to form polyhedral caged structures similar to those predicted for their isoelectronic counterparts, the neutral (V2O5)(n) clusters. Upon systematic exchange of V by Ti atoms in V4-nTinO10- (n=1-4), the structure does not change. The stress induced by the isomorphous substitution results in an increased number of unpaired electrons (n-1) for the Ti-rich systems, leading to a quartet ground state for Ti4O10-.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/29454
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