Reactions of nitric oxide with a low-spin Fe(III) center ligated to a tetradentate dicarboxamide N4 ligand: parallels between heme and non-heme systems.
Reaction of excess NO with the non-heme Fe(III) complex [(bpb)Fe(py)2]ClO4 in MeCN under strictly anaerobic conditions affords the {Fe-NO}6(nitro)(nitrosyl) complex [(bpb)Fe(NO)(NO2)] (1) via metal-promoted NO disproportionation, while in a MeOH/MeCN mixture, the same reaction leads to reductive nitrosylation and generation of the {Fe-NO}7 species [(bpb)Fe(NO)] (2). Exposure of a solution of 1 in DMF to dioxygen leads to formation of the ring-nitrosylated product [(bpb-NO2)Fe(NO3)(DMF)] (3). The present system therefore exhibits all the NO reactivities reported so far with the iron-porphyrins.
Patra
Apurba K
AK
Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA.
Rose
Michael J
MJ
Olmstead
Marilyn M
MM
Mascharak
Pradip K
PK
D000577:Amides / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005290:Ferric Compounds / Q000737:chemistry*; D006418:Heme / Q000737:chemistry*; D015394:Molecular Structure; D009569:Nitric Oxide / Q000737:chemistry*
D000577:Amides; D005290:Ferric Compounds; D009569:Nitric Oxide; D006418:Heme