EPR studies of the structure of transient radicals formed in photolytic reactions of some 2-nitrobenzyl compounds. Characterisation of aryl alkoxy aminoxyls and nitroaromatic radical-anions in the photolysis of caged ATP andrelated compounds
Jet. Corrie et al., EPR studies of the structure of transient radicals formed in photolytic reactions of some 2-nitrobenzyl compounds. Characterisation of aryl alkoxy aminoxyls and nitroaromatic radical-anions in the photolysis of caged ATP andrelated compounds, J CHEM S P2, (12), 2000, pp. 2483-2491
Citations number
37
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
Radical species generated on photolysis of 2-nitrobenzyl compounds, includi
ng derivatives of 1-(2-nitrophenyl)ethyl phosphate (caged ATP 1 and caged m
onomethyl phosphate 3) have been studied by EPR spectroscopy and their iden
tity confirmed by independent chemical generation of the appropriate nitrog
en-centred radicals. The reactions which occur include photo-isomerisation,
photo-fragmentation, photo-assisted electron-transfer, intramolecular addi
tion and spin-trapping reactions of the nitroso compounds produced via mole
cular rearrangement. In particular, a mechanistic scheme is advanced to exp
lain the co-formation of a radical-anion and a cyclic aryl alkoxy aminoxyl
(2 and 30, respectively, from caged ATP). Which of these species is observe
d in the EPR spectrum depends upon the particular experimental conditions.