Density functional study on the electronic structure of trioxorhenium organyls

Sibylle Köstlmeier, Oliver D. Häberlen, Notker Rösch, Wolfgang A. Herrmann, Bahman Solouki, Hans Bock

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29 Scopus citations

Abstract

A linear combination of Gaussian-type orbital density functional (LCGTO-DF) investigation of three rhenium-oxo complexes, RReO3 (R = CH3, η1-C6H5, η5-C5H5), is presented, showing the influence of the three different types of ligand-to-metal bonding σ-alkyl, σ-aryl, and π-aryl, respectively. The calculated ionization potentials of these compounds are compared to their He I photoelectron spectra and found to be in excellent agreement. In particular, the present results for H3C-ReO3 are much improved over various other theoretical approaches. Special attention is drawn to the -ReO3 fragment energy levels and to the nonbonding 2p lone pairs on the oxygen atoms; their relative energetic positioning allows conclusions on the charge distribution and thus on the Lewis acidity of the rhenium atom in the active site -ReO3. To assist this interpretation, Mulliken fragment charges and calculated dipole moments are discussed. A recently proposed relationship between the oxygen charge within the -ReO3 fragment and 17O NMR shifts is supported.

Original languageEnglish
Pages (from-to)1872-1878
Number of pages7
JournalOrganometallics
Volume15
Issue number7
DOIs
StatePublished - 2 Apr 1996

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