Structural consequences of nickel versus macrocycle reductions in F430 models: EXAFS studies of a Ni(I) anion and Ni(II). pi. anion radicals

Journal Article · Wed Feb 14 04:00:00 EST 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00160a056· OSTI ID:6710197

Furenlid, L R; Renner, M W; Fajer, J ^[1]; Smith, K M ^[2]

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1. Brookhaven National Lab., Upton, NY (USA)
2. Univ. of California, Davis (USA)

Factor 430 (F430) is a nickel tetrapyrrole (hydrocorphin) found in methyl coenzyme M reductase, the enzyme that catalyzes the final stages of the reduction of carbon dioxide to methane in methanogenic bacteria. Reduction of Ni(II) F430 and isobacteriochlorins unambiguously results in Ni(I) species whereas porphyrins, chlorins, and hexahydro- and octahydroporphyrins yield anions variously ascribed to Ni(I) or Ni(II) {pi} radicals with some metal character. The authors present here EXAFS results for the Ni(II) radical anions of a chlorin and a porphycene and for the Ni(I) anion of an isobacteriochlorin (iBC) that clearly demonstrate the structural consequences of metal versus macrocycle reductions.

• OSTI ID: 6710197
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:4; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090000 -- Biomass Fuels
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
ALKANES
BACTERIA
CALCULATION METHODS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
DATA ANALYSIS
ENZYMES
HYDROCARBONS
MEASURING INSTRUMENTS
MEASURING METHODS
METHANE
METHANOGENIC BACTERIA
MICROORGANISMS
NICKEL COMPLEXES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REDUCTION
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPLEXES