To be or not to be NO in coordination chemistry? A mechanistic approach

摘要

In this review, the reactions of nitric oxide with selected metal complexes of biological and environmental importance are reviewed. Fundamental chemical kinetics and mechanisms that lead to the formation and decay of nitrosyl complexes are illustrated and discussed on the basis of work on Fe(Ⅱ) chelate complexes and selected biomolecules such as metmyoglobin and cobalamin. In the context of common interference of higher nitrogen oxides in the studies on the interactions of nitric oxide with metal centres, the reactions of NO_2~-/HONO (in aqueous media) and NO_2/N_2O_3 (in aprotic media) with metal complexes are described on the basis of selected examples. Throughout the review the focus is on the mechanistic details of the binding of NO to and the release of NO from metal complexes, and the nature of the stable metal-NO complexes produced in solution.