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Observation of Carbodicarbene Ligand Redox Noninnocence in Highly Oxidized Iron Complexes
S.-C. Chan, P. Gupta, X. Engelmann, Z.Z. Ang, , E. Bill, K. Ray, S. Ye, J. England
Published in Wiley-VCH Verlag
PMID: 30239076
Volume: 57
Issue: 48
Pages: 15717 - 15722
To probe the possibility that carbodicarbenes (CDCs) are redox active ligands, all four members of the redox series [Fe(1)2]n+ (n=2–5) were synthesized, where 1 is a neutral tridentate CDC. Through a combination of spectroscopy and DFT calculations, the electronic structure of the pentacation is shown to be [FeIII(1.+)2]5+ (S= (Formula presented.)). That of [Fe(1)2]4+ is more ambiguous, but it has significant contributions from the open-shell singlet [FeIII(1)(1.+)]4+ (S=0). The observed spin states derive from antiferromagnetic coupling of their constituent low-spin iron(III) centres and cation radical ligands. This marks the first time redox activity has been observed for carbones and expands the diverse chemical behaviour known for these ligands. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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