ENDOR STUDY OF THE (7',7'-DICYANO)-7'-APO-BETA-CAROTENE AND (7'-PHENYL)-7'-APO-BETA-CAROTENE RADICAL CATIONS FORMED BY UV PHOTOLYSIS OF CAROTENOIDS ADSORBED ON SILICA-GEL

Authors
PIEKARASADY L JEEVARAJAN AS KISPERT LD BRADFORD EG PLATO M
Citation
L. Piekarasady et al., ENDOR STUDY OF THE (7',7'-DICYANO)-7'-APO-BETA-CAROTENE AND (7'-PHENYL)-7'-APO-BETA-CAROTENE RADICAL CATIONS FORMED BY UV PHOTOLYSIS OF CAROTENOIDS ADSORBED ON SILICA-GEL, Journal of the Chemical Society. Faraday transactions, 91(17), 1995, pp. 2881-2884
Citations number
18
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Journal title
Journal of the Chemical Society. Faraday transactions → ACNP
ISSN journal
09565000
Volume
91
Issue
17
Year of publication
1995
Pages
2881 - 2884
Database
ISI
SICI code
0956-5000(1995)91:17<2881:ESOT(A>2.0.ZU;2-Q
Abstract
The radical cations of two synthetic carotenoids, 7'-7'-dicyano-7'-apo -beta-carotene (I) and 7'-phenyl-7'-apo-B-carotene (ii), have been pre pared by UV irradiation of samples adsorbed on silica gel. The methyl proton hyperfine coupling constants were deduced from ENDOR powder spe ctra and assigned by RHF-INDO/SP calculations. The powder EPR spectra of the carotenoid radical cations formed photolytically by electron tr ansfer are unresolved, with a peak-to-peak linewidth of 15 +/- 1 G, ir respective of the donor or acceptor character of the terminal substitu ents.