ESR of a nitroxide radical and its radical pair in irradiated 1-hydroxyxanthine single crystals

Journal Article · Thu Mar 01 04:00:00 EST 1984 · Radiat. Res.; (United States)

DOI:https://doi.org/10.2307/3576134· OSTI ID:6970786

Sogabe, K; Alexander, C Jr

Single crystals of 1-hydroxyxanthine have been X-irradiated at 77 K and studied by ESR at 300 K. A nitroxide radical formed by abstraction of a hydrogen atom at N/sub 1/ is the primary species formed by the radiation. A nitrogen hyperfine tensor with principal values of 0.8, 2.6, and 13.6 G and a g tensor with principal values of 1.9985, 2.0031, and2.0099 have been determined. These results indicate a spin density of 0.24 on N/sub 1/. Pairwise trapping of the nitroxide radical was also detected and principal values of the dipolar coupling tensor were found to be 140.7, -69.4, and -67.8 G. These data indicate effective radical separations of 7.3 A and are consistent with molecular layer spacings of 3.5 A in this crystal structure.

• Research Organization: Univ. of Alabama, University
• OSTI ID: 6970786
• Journal Information: Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 97:3; ISSN RAREA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
AROMATICS
AZAARENES
CHEMISTRY
ELECTROMAGNETIC RADIATION
ELECTRON SPECTRA
ELECTRON SPIN RESONANCE
HETEROCYCLIC COMPOUNDS
IONIZING RADIATIONS
MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PURINES
RADIATION CHEMISTRY
RADIATIONS
RADICALS
RADIOINDUCTION
RESONANCE
SPECTRA
URIC ACID
X RADIATION
XANTHINES