ESR of sulfur substituted purines and nucleosides: Hydrogen atom and alkoxy radicals at 20 K

Journal Article · Mon Nov 15 04:00:00 EST 1982 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.443703· OSTI ID:6809195

Kim, H; Alexander, C Jr

Single crystals of the sulfur-substituted adenosine analog, 6-methylmercaptopurine riboside have been irradiated by x rays and studied by electron spin resonance techniques at 20 K. Three resonances have been identified. The radical R1 exhibited a 506 +- 2 G hyperfine doublet splitting and was identified as trapped hydrogen atoms. Radical R2, a secondary alkoxy radical at O'/sub 3/ identified previously at 77 K, was shown to be stable at 20 K. Radical R3 exhibited doublet splittings of 21 +- 3 G and 4 to 12 G and g-value principal values of 2.0019, 2.0077, and 2.0429, and was identified as a secondary alkoxy radical at O'/sub 2/. The presence of trapped hydrogen atoms in coincidence with the O'/sub 2/ and O'/sub 3/ hydrogen abstraction radicals at 20 K is an indication of direct hydrogen abstraction as a primary radiation event in this crystal.

• Research Organization: Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, Alabama 35486
• OSTI ID: 6809195
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 77:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKOXY RADICALS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
HETEROCYCLIC COMPOUNDS
IONIZING RADIATIONS
MAGNETIC RESONANCE
NUCLEOSIDES
NUCLEOTIDES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PURINES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
RESONANCE
RIBOSIDES
SULFUR COMPOUNDS
VERY LOW TEMPERATURE
X RADIATION