Photoelectron Spectroscopy of Bis(2,4-Pentanedione)−Oxovanadium(IV) [VO(acac)2] and Derivatives:  Substituent Effects on the 2,4-Pentanedione Donor

The electronic structure of derivatives of VO(acac)2 is probed using gas-phase UV-photoelectron spectroscopy [acac = 2,4-pentanedione]. The effect on the metal center of electron-donating and -withdrawing groups on the acac ligands is examined. Ionizations from metal-based, acac-based, and VO-based...

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Bibliographic Details
Published in:Inorganic chemistry 2002-11, Vol.41 (22), p.5907-5911
Main Authors: Gruhn, Nadine E, Michelsen, Laura J, Westcott, Barry L
Format: Article
Language:English
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Summary:The electronic structure of derivatives of VO(acac)2 is probed using gas-phase UV-photoelectron spectroscopy [acac = 2,4-pentanedione]. The effect on the metal center of electron-donating and -withdrawing groups on the acac ligands is examined. Ionizations from metal-based, acac-based, and VO-based orbitals are clearly observed. We find that changes at the ligand periphery lead to equivalent changes in the energies of the metal-based and ligand-based ionizations. Additionally, we find that a linear correlation exists between the ionization energies of the metalated complexes and the pK a values of the free ligands, indicating that the pK a is a good indication of the overall electron-donating abilities of acac ligands.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic0256056