Solvation of vanadyl acetylacetonate: a correlation between the solvent parameter E T , the electron spin resonance spectral parameters, and the optical spectra

Authors:
  • CGC. M. Guzy
    C. M. Guzy
  • JRJ. B. Raynor
    J. B. Raynor
  • MSM. C. R. Symons
    M. C. R. Symons
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Abstract
A good correlation between the solvent parameter ET and the g- and A-values of vanadyl acetylacetonate in 41 solvents is reported. From the changes in the optical spectra of the complex, it is shown that the third transition (24,600–25,600 cm.–1) is probably a charge-transfer transition (eπ→b2) and that adduct formation is characterised by the development of an extra, relatively intense, band in the region 23,200–24,000 cm.–1 which overlaps the eπ→b2 band. The particularly large influence of hydrogen-bonding solvents upon the e.s.r. parameters is interpreted in terms of hydrogen bonding to the vanadyl oxygen rather than co-ordination at the sixth position.