Properties of closed-shell, octahedral, multiply-charged hexafluorometallates MF{sub 6}{sup 3-}, M = Sc, Y, La, ZrF{sub 6}{sup 2-}, and TaF{sub 6}{sup -}
- Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Gdansk (Poland)
Properties of multiply-charged hexafluorometallates MF{sub 6}{sup 3-}, M = Sc, Y, La, ZrF{sub 6}{sup 2-}, and TaF{sub 6}{sup -}, have been examined at the SCF, MP2 and Becke3LYP levels of theory using the SBKJ pseudopotentials and extended one-electron basis sets. For MF{sub 6}{sup 3-}, M = Sc, Y, La, our results suggest a different assignment of vibrational transitions than those quoted by Nakamoto and recorded by von Becker et al. For the series of isoelectronic complexes, we document that the discrepancy between the theoretical gas phase vibrational frequencies and those measured in condensed phase experiments increases as the Becke3LYP HOMO binding energies become more positive. The frequencies of stretching modes measured in condensed phase experiments are systematically higher than those calculated for the gas phase anions. We suggest that a partial charge transfer from the multiply-charged anions to countercations is responsible for the stiffening of vibrational modes in condensed phase environments. The vertical electron detachment energies were determined at the outer valence Green`s function, MP2, and B3LYP levels. The binding energies of hexafluorometallates with respect to the energies of atomic ions were also calculated and only a small contribution of the electron correlation effects was found. 85 refs., 6 figs.
- OSTI ID:
- 219651
- Journal Information:
- Journal of the American Chemical Society, Vol. 118, Issue 5; Other Information: PBD: 7 Feb 1996
- Country of Publication:
- United States
- Language:
- English
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