ESR study of irradiated 1:1 co-crystals of 9-ethyladenine:5,5-diethylbarbituric acid (barbital) at 295 K
Crystals of the 1:1 complex of 9-ethyladenine:5,5-diethylbarbituric acid have been irradiated with 4.0 MeV electrons at 295 K and examined using electron spin resonance spectroscopy. Three radical species were observed. One of these was identified to be the barbital ethyl-abstraction radical (I) with the main part of the unpaired spin density at C5 interacting with two ..beta.. protons. A second species is the H adduct at the C2 position of 9-ethyladenine (II). The third radical is tentatively assigned to the corresponding C8 H adduct (III). The relative contribution of each of these radicals to the total resonance is discussed and compared to that for the isolated compounds. It is concluded that the present data give no evidence for horizontal or vertical charge transfer between the bases.
- Research Organization:
- Department of Biophysics, Institute of Physics, University of Oslo, Blindern, N-Oslo 3, Norway
- OSTI ID:
- 5781676
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 79:1; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Imidazole. pi. cation and barbital. pi. anion trapped in a cocrystalline complex x-irradiated at 12 K: An ESR--ENDOR study
ESR study of hydrogen-bombarded 9-methyladenine. [X ray]
Related Subjects
400600* -- Radiation Chemistry
ADENINES
AMINES
ANESTHETICS
ANTIMETABOLITES
AZINES
BARBITURATES
BEAMS
CENTRAL NERVOUS SYSTEM DEPRESSANTS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DRUGS
ELECTRON BEAMS
ELECTRON SPIN RESONANCE
ENERGY RANGE
HETEROCYCLIC COMPOUNDS
HYPNOTICS AND SEDATIVES
LEPTON BEAMS
MAGNETIC RESONANCE
MEV RANGE
MEV RANGE 01-10
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PARTICLE BEAMS
PURINES
PYRIMIDINES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
RESONANCE