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Vapor phase core electron binding energies were determined by X-ray photoelectron-spectroscopy for nine vanadium compounds. binding energies were correlated using CHELEQ atomic charges and the "transition state" point charge potential equation. Excellent correlation was obtained for compounds which are well represented by a single valence bond structure. In the case of the other compounds, information regarding the relative contributions of various resonance structures and the importance of back-bonding was obtained by comparison of experimental and calculated binding energies.

An x-ray photoelectron spectroscopic study of volatile vanadium compounds