title: A bridged di-iron porphyrin hyponitrite complex as a model for biological N2O production from hyponitrite.
abstract: Heme-hyponitrites are intermediates that form at the bimetallic active sites of bacterial nitric oxide reductases. To probe a possible effect of the Fe-Fe distance on hyponitrite stability, we prepared a bridged bis-porphyrin Fe-hyponitrite compound, namely [(OEP-CH2)Fe]2(μ2,η(1),η(1)-ONNO). Its υNO of 992 cm(-1) (υ15NO of 976 cm(-1)) is close to the υNO of 983 cm(-1) reported previously by us for the crystallographically characterized [(OEP)Fe]2(μ2,η(1),η(1)-ONNO) compound. The bridged bis-porphyrin Fe-hyponitrite complex is unstable with respect to N2O production, supporting the role of the bis-Fe porphyrin system in hyponitrite conversion to N2O. The preparation and crystallographic determination of the bridging sulfato derivative is also reported.
authors.affiliation: Division of Mathematics and Natural Sciences, Penn State Altoona, 3000 Ivyside Park, Altoona, PA 16601, USA; Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, Norman, OK 73019, USA. Electronic address: nxx103@psu.edu.
authors.forename: Nan
authors.initials: N
authors.lastname: Xu
authors.affiliation: Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, Norman, OK 73019, USA.
authors.forename: Erwin G
authors.initials: EG
authors.lastname: Abucayon
authors.affiliation: Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, Norman, OK 73019, USA.
authors.forename: Douglas R
authors.initials: DR
authors.lastname: Powell
authors.affiliation: Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center, University of Oklahoma, Norman, OK 73019, USA. Electronic address: grichteraddo@ou.edu.
authors.forename: George B
authors.initials: GB
authors.lastname: Richter-Addo
mesh_terms: D008665:Metalloporphyrins / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009573:Nitrites / Q000737:chemistry*; D009585:Nitrogen Dioxide / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D008665:Metalloporphyrins; D009573:Nitrites; C025117:hyponitrite; D009585:Nitrogen Dioxide
keywords: Hyponitrite; Infrared; Iron; Porphyrin; Sulfate