Phil A. Schauer and Paul J. Low Ligand Redox Non-Innocence in Transition-Metal σ-Alkynyl and Related Complexes European Journal of Inorganic Chemistry 2012
Many transition-metal σ-alkynyl complexes are redox-active, undergoing facile oxidation (reduction) at moderate potentials to generate radical cations (anions). This review summarises the diverse chemical behaviour of metal-supported σ-alkynyl radicals, which can often be rationalised in terms of the distribution of electron-spin density over the metal alkynyl scaffold.
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