ESR spectroscopic investigation of some 4-substituted 1,3,2-dithiazolyl and 2,3,1-dithiazolyl radicals

Autor: Leslie H. Sutcliffe, Shirley A. Fairhurst, Keith F. Preston, Yuen-Li Chung, Duncan G. Gillies
Rok vydání: 2005
Předmět:
Zdroj: Magnetic Resonance in Chemistry. 30:666-672
ISSN: 1097-458X
0749-1581
DOI: 10.1002/mrc.1260300717
Popis: Further information has been obtained on the electronic structure of 1,3,2-dithiazol-2-yl radicals. The structure has been well characterized previously except for positions 4 and 5 in the ring. We have obtained solution and powder ESR spectra of radicals substituted with 13C in both positions and of radicals substituted with nitrogen or phosphorus in the 4-position. It is probably the first time that a compound has been prepared containing the ring. Two especially interesting facts emerged from the ESR spectra of these 1,3,2-dithiazolyl radicals: the 13C-substituted radical has a considerable amount of p spin density in the plane of the ring and the phosphorussubstituted radical has a very low unpaired spin density at the phosphorus atom. It is known that 1,3,2,4-dithiadiazolyl radicals isomerize readily by photolysis to the symmetrical 2,3,1,4-dithiadiazolyl radicals; we attempted the same reaction with But and a new radical was produced that we have been unable to identify.
Databáze: OpenAIRE
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