ESR and spin trapping study of. gamma. -irradiated aqueous hydantoin solutions. Keto-enol equilibrium and post-radiolysis growth

Journal Article · Thu Sep 01 04:00:00 EDT 1983 · Radiat. Res.; (United States)

DOI:https://doi.org/10.2307/3576097· OSTI ID:5433740

Makino, K; Mossoba, M M; Riesz, P

An air-saturated aqueous hydantion soluton was ..gamma..-irradiated in the presence of the spin trap 2-methyl-2-nitrosopropane(MNP). The ESR spectrum of the spin adduct produced from hydantoin was assigned to the structure NH-C(=O)-NH-C(=O)-CH-N(O)-/sup t/Bu (I). When the pH was raised from 9.7 to 12.5, it was found that the structure of the spin adduct changes to N=C(O/sup -/)-N=C(OH)-CH-N(O)-/sup t/Bu and that this change is reversible. This spectral change was investigated as a function of pH, and the pK value for the equilibrium was found to be about 11.5. The post-radiolysis growth of the ESR signal was observed for the spin adduct I and di-t-butyl nitroxide, which is produced in the same solution, and was markedly pH dependent. The mechanism for this growth is the same as that previously found in a photolysis study of aqueous MNP solutions.

• Research Organization: National Inst. of Health, Bethesda, MD
• OSTI ID: 5433740
• Journal Information: Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 95:3; ISSN RAREA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKANES
AQUEOUS SOLUTIONS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DIAMAGNETISM
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
GAMMA RADIATION
HYDROCARBONS
IONIZING RADIATIONS
MAGNETIC RESONANCE
MAGNETISM
MIXTURES
NITROSO COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PH VALUE
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
RESONANCE
SOLUTIONS