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Not Guilty on Every Count: The âNonâInnocentâ Nitrosyl Ligand in the Framework of IUPACâ˛s OxidationâState Formalism
Nitrosylâmetal bonding relies on the two interactions between the pair of NâOâĎ* and two of the metal's d orbitals. These (back)bonds are largely covalent, which makes their allocation in the course of an oxidationâstate determination ambiguous. However, apart from MâNâOâangle or netâcharge considerations, IUPACâ˛s âionic approximationâ is a useful tool to reliably classify nitrosyl metal complexes in an orbitalâcentered approach