Russian Chemical Bulletin

, Volume 48, Issue 9, pp 1762–1766 | Cite as

New semiquinone-catecholate rhodium complex with 2,2′-dipyridyl

  • G. A. Abakumov
  • V. K. Cherkasov
  • M. P. Bubnov
  • L. G. Abakumova
  • L. N. Zakharov
  • G. K. Fukin
Organometallic Chemistry


A new semiquinone rhodium complex,viz., (2,2′-dipyridyl)(3,6-di-tert-butyl-o-benzosemiquinone)(3,6-di-tert-butylcatecholate)rhodium(III) (1), which is a structural analog of the known redox-isomeric cobalt complex, was prepared, isolated in the individual state, and characterized by X-ray analysis, magnetochemistry, and IR and ESR spectroscopy. At room temperature, compound1, unlike the cobalt analog, is a complex of trivalent low-spin rhodium with one catecholate and one semiquinone ligand. However, broadening of the lines in the ESR spectra both of a solution and a powder of complex1 with increasing temperature indicates that the redox-isomeric transformation occurs in this case as well. The equilibrium of this transformation is virtually completely shifted toward the low-spin semiquinone-, catecholate isomer.

Key words

rhodium(III) o-semiquinone redox isomerism X-ray diffraction study ESR spectra 


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Copyright information

© Kluwer Academic/Plenum Publishers 1999

Authors and Affiliations

  • G. A. Abakumov
    • 1
  • V. K. Cherkasov
    • 1
  • M. P. Bubnov
    • 1
  • L. G. Abakumova
    • 1
  • L. N. Zakharov
    • 1
  • G. K. Fukin
    • 1
  1. 1.G. A. Razuvaev Institute of Organometallic ChemistryRussian Academy of SciencesNizhnii NovgorodRussian Federation

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