title: Proton-induced reactivity of NO⁻ from a {CoNO}⁸ complex.
abstract: Research on the one-electron reduced analogue of NO, namely nitroxyl (HNO/NO(-)), has revealed distinguishing properties regarding its utility as a therapeutic. However, the fleeting nature of HNO requires the design of donor molecules. Metal nitrosyl (MNO) complexes could serve as potential HNO donors. The synthesis, spectroscopic/structural characterization, and HNO donor properties of a {CoNO}(8) complex in a pyrrole/imine ligand frame are reported. The {CoNO}(8) complex [Co(LN4(PhCl))(NO)] (1) does not react with established HNO targets such as Fe(III) hemes or Ph3P. However, in the presence of stoichiometric H(+) 1 behaves as an HNO donor. Complex 1 readily reacts with [Fe(TPP)Cl] or Ph3P to afford the {FeNO}(7) porphyrin or Ph3P═O/Ph3P═NH, respectively. In the absence of an HNO target, the {Co(NO)2}(10) dinitrosyl (3) is the end product. Complex 1 also reacts with O2 to yield the corresponding Co(III)-η(1)-ONO2 (2) nitrato analogue. This report is the first to suggest an HNO donor role for {CoNO}(8) with biotargets such as Fe(III)-porphyrins.
authors: Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , Athens, Georgia 30602, United States.
authors: Melody A
authors: MA
authors: Rhine
authors: Andria V
authors: AV
authors: Rodrigues
authors: Ramona J
authors: RJ
authors: Bieber Urbauer
authors: Jeffrey L
authors: JL
authors: Urbauer
authors: Timothy L
authors: TL
authors: Stemmler
authors: Todd C
authors: TC
authors: Harrop
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009569:Nitric Oxide / Q000737:chemistry*; D009589:Nitrogen Oxides / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D011522:Protons
chemical_list: D009589:Nitrogen Oxides; D009942:Organometallic Compounds; D011522:Protons; D009569:Nitric Oxide; D003035:Cobalt; C039900:nitroxyl