Innocent or guilty? Catecholato–platinum(II) complexes with phenol-substituted α-diimine ligands are oxidised to the corresponding paramagnetic radical cationic complexes, as well as deprotonated to the corresponding base (see scheme). The radical cations are ortho-benzosemiquinoid in character (EPR spectroscopy). The diamagnetic anions can be described by para-iminoquinonoid resonance formulae and are luminescent at room temperature in fluid solution (static and time-resolved emission).
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Heinze et al. (2008) studied this question.
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