Conclusions
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1.
Analysis of the hyperfine structure in the EPR spectra of dicarbonyl semiquinone complexes served as the basis for evaluating the spin density of the unpaired electron localized predominantly in the semiquinone ligand.
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2.
The coupling constant with the13C nucleus in CO for the SQ complexes is sensitive to the ligand environment but cannot be used for determining the position of the carbonyl ligand in the complex relative to SQ.
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Literature cited
V. I. Nevodchikov, G. A. Abakumov, V. K. Cherkasov, and G. A. Razuvaev, J. Organomet. Chem.,214, 119 (1981).
G. A. Abakumov, V. I. Nevodchikov, and V. K. Cherkasov, Izv. Akad. Nauk SSSR, Ser. Khim., 2709 (1985).
S. A. Fieldhouse, B. W. Fullam, G. W. Neilson, and M. G. R. Symons, J. Chem. Soc., Dalton Trans., 567 (1974).
G. A. Razuvaev, V. K. Cherkasov, and G. A. Abakumov, J. Organomet. Chem.,160, 361 (1978).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1411–1413, June, 1988.
The authors thank Yu. S. Varshavskii for providing samples of rhodium dicarbonyl halides containing 100% carbon-13 isotope.
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Abakumov, G.A., Nevodchikov, V.I. & Cherkasov, V.K. EPA spectra of13CO-labelled rhodium carbonyl o-benzosemiquinone complexes. Russ Chem Bull 37, 1245–1247 (1988). https://doi.org/10.1007/BF00961944
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DOI: https://doi.org/10.1007/BF00961944