Three Redox States of Nitrosyl: NO+, NO? and NO?/HNO Interconvert Reversibly on the Same Pentacyanoferrate(II) Platform

MONTENEGRO, A. C.; AMOREBIETA, V. T.; SLEP, L. D.; MARTIN, D. F.; RONCAROLI, F.; MURGIDA, D. H.; BARI, S.; OLABE, J. A.

Angewandte Chemie

Wiley VCH

Lugar: Weinheim, Alemania; Año: 2009 vol. 48 p. 4213 - 4216

1433-7851

One-electron redox changes of bound nitrosyl species are at the heart of the enzymatic processes involving reversible conversions of NO2 into NH3, which occur either in bacterial processes in soils or in the biosynthesis/degradation events of nitrogen monoxide (NO) in the biological fluids of mammals. This explains the interest in the coordination chemistry of NO and the very reactive redox-active partners, the nitrosonium cation (NO+) and the nitroxyl anion (NO). The three diatomic entities have been identified when bound to transition metals. Although a fragment model considering covalent interactions between the metal and nitrosyl is currently employed, detailed spectroscopic measurements and/or theoretical calculations frequently allow the use of a limiting description comprising NO+, NOC, and NO ligands bound to metals with the corresponding formal charges.