A theoretical study of molecular titanium oxide clusters: structure, bonding, vibrations and stability
Literature Information
First principles quantum chemical calculations at the HF, MP2 and B3LYP levels of theory, using the LANL2DZ basis set, were used to explore the potential energy hypersurfaces (PESs) of ionic titanium(IV) oxide clusters of molecular dimensions, formulated as TiO32-, Ti2O32+, Ti2O52- and Ti2O64-. The neutral protonated species of the anions were also investigated at the same level of theory. The energetics of all topomers corresponding to global or local minima and saddle points in the potential energy hypersurfaces were computed at the more sophisticated QCISD(T) level. The protonation of the anionic metal oxide clusters produces neutral species and the computed proton affinities were in the range 1720–2000 kJ mol-1. The computed structural, energetic and spectroscopic properties of the clusters are in line with available experimental and theoretical results. The formation processess of the Ti2O52- dianion from TiO32- and TiO2 species and the Ti2O64- tetraanion by dimerization of the TiO32- species are predicted to be exothermic and endothermic, respectively.
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Physical Chemistry Chemical Physics

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