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Reversible ligand-centered one-electron oxidation of square-planar neutral complexes of palladium(II) and platinum(II) [M(bpy)(L)] (bpy=bipyridine, L: see picture) leads to the paramagnetic complexes [M(bpy)(L.)]+. Thus, the existence of S,S-coordinated o-dithiobenzosemiquinonate(1−) π radical ions has been proven unequivocally.
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Ghosh et al. (2003) studied this question.
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