Vanadium(IV) porphyrins: synthesis and spectrochemical characterization of dihalogenovanadium(IV) porphyrins. Extended X-ray absorption fine structural study of dibromo(2,3,7,8,12,13,17,18-octaethylporphyrinato) vanadium(IV)
- 1 January 1982
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 8,p. 1451-1456
- https://doi.org/10.1039/dt9820001451
Abstract
The action of SOX2 or (COX)2 on oxovanadium(IV) porphyrin complexes [VIVL(O)](L = porphyrinate) under mild conditions affords the corresponding dihalogenovanadium(IV) porphyrins [VIVLX2](X = Cl or Br). These very reactive complexes are remarkable precursors to low-valent vanadium porphyrins. Extended X-ray absorption fine structure spectroscopy at the Br K edge confirms the trans configuration and INDO/S calculations suggest that the absence of an e.s.r. signal is due to an orbitally degenerate ground state.Keywords
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