A kinetic study on-the spin polarization switching of benzil in the presence of triethylamine

Authors
Okutsu, T Ooyama, M Tani, K Hiratsuka, H Kawai, A Obi, K
Citation
T. Okutsu et al., A kinetic study on-the spin polarization switching of benzil in the presence of triethylamine, J PHYS CH A, 105(15), 2001, pp. 3741-3744
Citations number
23
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY A
ISSN journal
10895639 → ACNP
Volume
105
Issue
15
Year of publication
2001
Pages
3741 - 3744
Database
ISI
SICI code
1089-5639(20010419)105:15<3741:AKSOSP>2.0.ZU;2-#
Abstract
Dual spin polarization of CIDEP signal of radicals produced in benzil/triet hylamine in the benzene system was investigated by the time-resolved ESR an d transient absorption technique. CIDEP signals showed absorption or emissi on depending on the concentration of triethylamine. Emissive CIDEP signal w as observed below 10(-3) RI of triethylamine, whereas absorptive signal was observed above 10(-1) M. The dual CIDEP signal was explained by the triple t mechanism (TM) and the radical-triplet pair mechanism (RTPM); the absorpt ive polarized TM signal was generated from the reaction- of free triplet be nzil with triethylamine, whereas the emissive polarized CIDEP signal was ge nerated through the interaction between tripler benzil and benzil ketyl rad ical produced from the benzil-triethylamine complex.