Radiation chemical studies of nickel-glycine. Hydrogen abstraction by OH radicals and oxidation by Br/sub 2//sup -1/. [Gamma radiation]

Journal Article · Thu May 28 04:00:00 EDT 1981 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150611a013· OSTI ID:6205462

Battacharyya, S N; Neta, P

Reactions of hydroxyl radicals with Ni(II)-glycine complexes were studied by pulse radiolysis and by product analysis. Radiolytic degradation of the complexes in N/sub 2/O-saturated solutions leads to the formation of carbonyl compounds. The nature and the yield of these products indicate that the transient formed by reaction of OH with the complex undergoes disproportionation. The optical absorption spectrum of this transient exhibits a maximum below 250 nm, which is similar to that observed with glycine alone. The reaction of Br/sub 2//sup -/ with the complex is found to be too slow to be observed by pulse radiolysis. However, the reaction occurs in steady-state radiolysis and yields products different from those observed with OH. Specifically, the yield of formaldehyde is appreciably higher in the presence of Br/sup -/. It is concluded that Br/sub 2//sup -/ oxidizes the metal center of the Ni(II)-glycine complex to Ni(III), whereas OH reacts by hydrogen abstraction to form Ni(II)-coordinated glycine radical.

• Research Organization: Univ. of Notre Dame, IN
• OSTI ID: 6205462
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Journal Issue: 11 Vol. 85:11; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALDEHYDES
AMINO ACIDS
ANIONS
BROMINE
CARBONYLS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELEMENTS
EXPERIMENTAL DATA
FORMALDEHYDE
G VALUE
GAMMA RADIATION
GLYCINE
HALOGENS
HYDROXYL RADICALS
INFORMATION
IONIZING RADIATIONS
IONS
NICKEL COMPLEXES
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
TRANSITION ELEMENT COMPLEXES