Radical pairs and trapped electrons in single crystals of pentaerythritol: an electron spin resonance and pulse radiolysis kinetic study

Journal Article · Thu Jul 19 04:00:00 EDT 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150659a030· OSTI ID:5984642

Nilsson, G; Lund, A

The rate of transformation of radical pairs to monoradicals in ..gamma..-irradiated single crystals of pentaerythritol C(CH/sub 2/OH)/sub 4/, protonated or deuterated in the hydroxyl groups, was obtained by measuring the decay rate of the ESR signal of the radical pairs from 106 to 129 K. An isotope effect in the transformation rate was found and hydrogen atom tunneling seems to be involved. A mechanism is proposed. Pulse radiolysis data have shown that there is an isotope effect also in the decay rate of the optical absorption of electrons trapped in the crystal. The activation energies are 6.7 and 9.0 kcal/mol and the absorption maxima are at 430 and 510 nm for C(CH/sub 2/OH)/sub 4/ and C(CH/sub 2/OD)/sub 4/, respectively. A second moment analysis of the ESR line of the electrons shows that they are most likely trapped in interstitial positions. 20 references, 8 figures, 1 table.

• Research Organization: Studsvik Science Research Lab., Nykoeping, Sweden
• OSTI ID: 5984642
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:15; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400303 -- Organic Chemistry-- Isotope Exchange & Isotope Separation-- (-1987)
400600* -- Radiation Chemistry
ABSORPTION SPECTRA
ALKYNES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CRYSTAL STRUCTURE
CRYSTALS
DATA
DECOMPOSITION
DEUTERIUM
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
GAMMA RADIATION
HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
INFORMATION
IONIZING RADIATIONS
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LIGHT NUCLEI
LOW TEMPERATURE
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
MONOCRYSTALS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
REACTION KINETICS
RESONANCE
SPECTRA
STABLE ISOTOPES