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Back in the saddle: Copper corroles do not contain a CuIII ion, but rather a well-hidden CuII ion. A comparative crystallographic and theoretical study (see spin-density representation) of isostructural corroloid complexes with copper ions in different formal oxidation states suggests that the divalent state is stabilized through a saddling distortion of the corrole ligand.
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Bröring et al. (2006) studied this question.
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