A recent publication presented X-ray absorption data challenging the assignment of charge for members of the [CrIII(Q)3]n, n = 3+ to 3− redox series. Structural, spectral, and magnetic properties reported for various members of the series unambiguously point to ligand-based redox steps with the metal remaining as Cr(III) through the series.
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Cortlandt G. Pierpont (2001) studied this question.
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