Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
PHOTOINDUCED ELECTRON-TRANSFER BETWEEN CAROTENOIDS AND SOLVENT MOLECULES
Autore:
KONOVALOVA TA; KISPERT LD; KONOVALOV VV;
Indirizzi:
UNIV ALABAMA,DEPT CHEM,BOX 870336 TUSCALOOSA AL 35487 UNIV ALABAMA,DEPT CHEM TUSCALOOSA AL 35487 RUSSIAN ACAD SCI,INST CHEM KINET & COMBUST SB NOVOSIBIRSK 630090 RUSSIA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 39, volume: 101, anno: 1997,
pagine: 7858 - 7862
SICI:
1089-5647(1997)101:39<7858:PEBCAS>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXCITED SINGLET-STATE; PORPHYRIN-PYROMELLITIMIDE TRIADS; BETA-CAROTENE; CARBON-TETRACHLORIDE; PARAMAGNETIC-RESONANCE; SPIN-RESONANCE; RADIOLYSIS; TEMPERATURE; RADICALS; LIFETIME;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
T.A. Konovalova et al., "PHOTOINDUCED ELECTRON-TRANSFER BETWEEN CAROTENOIDS AND SOLVENT MOLECULES", JOURNAL OF PHYSICAL CHEMISTRY B, 101(39), 1997, pp. 7858-7862

Abstract

EPR evidence for photoinduced electron transfer from beta-carotene and canthaxanthin to solvent molecules under 308-578 nm photolysis of frozen carotenoid solutions in CCl4, CHCl3, CH2Cl2, and CS2 has been obtained. The paramagnetic species are stable at 77 K and are attributed to carotenoid radical cations (Car(.+)) and solvent derived radicals, For a CS2 solution, solvent radicals are identified as CS2.- radical anions, and for chlorinated solvents, they can be assigned to either a predissociation species (R ... CI)(.-) or radical products R-.. The proposed reaction mechanism includes energy and electron transfer from the S-1 and S-2 excited singlet states of carotenoid molecules to the solvent to form an intermediate donor-acceptor complex (1)[Car ... Sol] which decays yielding solvent-separated radical-ion pairs (Car(.+)... Sol ... Sol(.-)).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 07:43:17