Paramagnetic organomercury complexes of quinones: An ESR study of .TQHgR radicals (TQ = benzo[2,1-b;3,4-b?]dithiophen-4,5-dione)

The ESR spectra of the paramagnetic species produced by photoreaction of benzo[2,1-b;3,4-b']dithiophen-4,5-dione with a number of organomercurials RHgR, have been recorded. The spectral parameters and the temperature dependence of the 199-Hg coupling constants are consistent with a structure of the adducts in which the Hg atom is bound to both carbonyl oxygens.