Pulse radiolysis of monophenyl phosphate in aqueous solution. [Electron pulses]

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Radiat. Res.; (United States)

DOI:https://doi.org/10.2307/3575078· OSTI ID:6168783

Grabner, G; Sacher, M; Getoff, N

Pulse radiolysis of aqueous monophenyl phosphate was carried out at pH values between 0.3 and 13.5. The rate constants with the primary products of water radiolysis were measured, and kinetic absorption spectroscopy was used to investigate the spectra and reactions of the transients. The primary reactions and the spectroscopic characteristics of the radicals produced by the attack of H and OH are mainly determined by the aromatic moiety of the phenyl phosphate molecule. The subsequent reactions, however, are markedly influenced by the phosphate group. The rate of bimolecular decay of OH- and H-adducts is exceptionally low at pH greater than or equal to 6; in neutral and alkaline solutions, no unimolecular elimination of either H/sub 2/O or inorganic phosphate from adducts occurs on the time scale of pulse radiolysis measurements. Rapid elimination processes are only possible from OH-adducts in acid medium (pH less than or equal to 3). Under these conditions, phenoxyl radicals and a previously unreported transient absorption with lambda/sub max/ = 420 nm and first-order decay are observed. The latter is tentatively assigned to the phenyl phosphate radical formed from OH-adducts by H/sub 2/O elimination.

• Research Organization: Institut fuer Theoretische Chemie und Strahlenchemie, Vienna, Austria
• OSTI ID: 6168783
• Journal Information: Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 77:1; ISSN RAREA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
AQUEOUS SOLUTIONS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DISPERSIONS
ELECTRONS
ELEMENTARY PARTICLES
ESTERS
FERMIONS
HYDROXYL RADICALS
IRRADIATION
KINETICS
LEPTONS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PH VALUE
PHOSPHORIC ACID ESTERS
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION INTERMEDIATES
REACTION KINETICS
SOLUTIONS