A WEAK-FIELD EPR STUDY OF TANOL IN WATER AND WATER-OIL USING DYNAMIC NUCLEAR-POLARIZATION

Authors
HORASAN N SUNNETCIOGLU MM SUNGUR R BINGOL G
Citation
N. Horasan et al., A WEAK-FIELD EPR STUDY OF TANOL IN WATER AND WATER-OIL USING DYNAMIC NUCLEAR-POLARIZATION, Zeitschrift fur Naturforschung. A, A journal of physical sciences, 52(6-7), 1997, pp. 485-489
Citations number
17
Categorie Soggetti
Chemistry Physical",Physics
Journal title
Zeitschrift fur Naturforschung. A, A journal of physical sciences → ACNP
ISSN journal
09320784
Volume
52
Issue
6-7
Year of publication
1997
Pages
485 - 489
Database
ISI
SICI code
0932-0784(1997)52:6-7<485:AWESOT>2.0.ZU;2-5
Abstract
Solutions of 4-hydroxy-TEMPO(TANOL) in water and water-soyabean oil we re investigated in the concentration range 0.1 mM-10 mM. Dynamic nucle ar polarization (DNP) and electronic relaxation time T-1e measurements were performed at each well resolved hyperfine line. In the TANOL/wat er-soyabean oil solutions, the effect of the presence of soyabean oil was an increase in the measured relaxation rates and a decrease in the observed enhancements. In addition, the observed enhancements diminis hed in time. For all of the samples, the relaxation rates decreased as the frequency of the transition increased.