Oxygen atom transfer from nitrite mediated by Fe(III) porphyrins in aqueous solution.
Aqueous solutions of the iron(III) porphyrin complex FeIII(TPPS) (1, TPPS = tetra(4-sulfonatophenyl)-porphyrinato) and nitrite ion react with various substrates S to generate the ferrous nitrosyl complex FeII(TPPS)(NO) (2) plus oxidized substrate. When S is a water-soluble sulfonated phosphine, the product is the resulting monoxide. When air is introduced to the product solutions, 2 is rapidly reoxidized to 1; however, even in the absence of air, there is a slow regeneration of the ferric species with concomitant production of nitrous oxide. Thus, in an anaerobic aqueous environment, FeIII(TPPS) catalyzes oxygen atom transfer from nitrite ion to substrates with the eventual formation of N2O.
Khin
Chosu
C
Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, USA.
Heinecke
Julie
J
Ford
Peter C
PC
D005290:Ferric Compounds / Q000737:chemistry*; D008024:Ligands; D008665:Metalloporphyrins / Q000737:chemistry*; D009573:Nitrites / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D014867:Water / Q000737:chemistry
D005290:Ferric Compounds; D008024:Ligands; D008665:Metalloporphyrins; D009573:Nitrites; D012996:Solutions; D014867:Water; D010100:Oxygen