Anomalous broadening of EPR lines of free radicals in solutions containingsinglet dioxygen

Authors
Gekhman, AE Moiseeva, NI Timokhina, EN Bozhenko, KV Minin, VV Larin, GM Bashtanov, ME Krasnovskii, AA Moiseev, II
Citation
Ae. Gekhman et al., Anomalous broadening of EPR lines of free radicals in solutions containingsinglet dioxygen, RUSS J PH C, 74, 2000, pp. S435-S444
Citations number
27
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY
ISSN journal
00360244 → ACNP
Volume
74
Year of publication
2000
Supplement
3
Pages
S435 - S444
Database
ISI
SICI code
0036-0244(2000)74:<S435:ABOELO>2.0.ZU;2-Q
Abstract
The decomposition of hydrogen peroxide in the H2O2/V(V)/AcOH and Mo(VI)/H2O 2/H2O systems occurs by the molecular mechanism and yields singlet dioxygen O-1(2)((1)Deltag). Under the conditions of O-1(2) formation, the EPR signa l of the paramagnetic particle experiences unusual (to 10 G) broadening. Po ssible reasons for such a broadening are discussed (triplet dioxygen effect s, chemical interactions of the O-1(2) free radical, spin-spin coupling, or electron exchange between O-1(2) and the free radical).