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pi. cation radicals of isobacteriochlorins: implications for nitrite and sulfite reductases

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100489a021· OSTI ID:5516800
; ; ; ;
Stable cation radicals of free base and metalloisobacteriochlorins have been generated chemically and electrochemically and characterized by optical, magnetic, and electrochemical techniques. The ESR spectra of the radicals have been assigned on the basis of ENDOR results, selective deuteration, and molecular orbital calculations. Evidence for a cation radical of an iron(II) isobacteriochlorin-pyridine-carbon monoxide complex is also presented. The facile oxidations of the isobacteriochlorin class and the existence of iron ..pi.. cations suggest that such radicals may mediate electron transport in nitrite and sulfite reductases, enzymes which catalyze the six-electron reductions of nitrite to ammonia and of sulfite to hydrogen sulfide, and which contain iron isobacteriochlorin prosthetic groups.
Research Organization:
Brookhaven National Lab., Upton, NY
DOE Contract Number:
EY-76-C-02-0016
OSTI ID:
5516800
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:26; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

090320* -- Inorganic Hydrogen Compound Fuels-- Preparation-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AMMONIA
AZINES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COMPLEXES
DATA
DATA FORMS
ELECTRON SPIN RESONANCE
ENDOR
ENZYMES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INFORMATION
IRON COMPLEXES
ISOLATED VALUES
MAGNETIC RESONANCE
NITRITES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXIDOREDUCTASES
OXYGEN COMPOUNDS
PYRIDINE
PYRIDINES
REDUCTION
RESONANCE
SULFIDES
SULFITES
SULFUR COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
VOLTAMETRY