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Titolo:
THE INFLUENCE OF SPIN-FORBIDDEN MONOMER EXCITATIONS ON SPIN-ALLOWED ELECTRON-TRANSFER AND ELECTRON-LOCALIZED STATES OF MIXED-VALENCE AND SINGLE-VALENCE DIMERIC SYSTEMS
Autore:
REIMERS JR; HUSH NS;
Indirizzi:
UNIV SYDNEY,DEPT PHYS & THEORET CHEM SYDNEY NSW 2006 AUSTRALIA UNIV SYDNEY,DEPT BIOCHEM SYDNEY NSW 2006 AUSTRALIA
Titolo Testata:
Inorganica Chimica Acta
fascicolo: 1-2, volume: 226, anno: 1994,
pagine: 33 - 42
SICI:
0020-1693(1994)226:1-2<33:TIOSME>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOSYNTHETIC REACTION CENTER; BRIDGED SYSTEMS; ENERGY-TRANSFER; RHODOPSEUDOMONAS-VIRIDIS; INTERMEDIATE NEGLECT; 3A RESOLUTION; SPECTROSCOPY; COMPLEXES; TRANSITION; SPECTRA;
Keywords:
SPIN-FORBIDDEN EXCITATION; SPIN-ALLOWED ELECTRON TRANSFER; ELECTRON-LOCALIZED STATES; MIXED-VALENCE SYSTEMS; SINGLE-VALENCE SYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
J.R. Reimers e N.S. Hush, "THE INFLUENCE OF SPIN-FORBIDDEN MONOMER EXCITATIONS ON SPIN-ALLOWED ELECTRON-TRANSFER AND ELECTRON-LOCALIZED STATES OF MIXED-VALENCE AND SINGLE-VALENCE DIMERIC SYSTEMS", Inorganica Chimica Acta, 226(1-2), 1994, pp. 33-42

Abstract

Models for the spin-allowed absorption spectra of weakly interacting dimeric systems are usually cast in terms of perturbed localized spin-allowed excitations on each chromophore, enhanced by the addition of electron-transfer excitations between them. We show that locally spin-forbidden processes on individual chromophores, when coupled weakly to either unpaired spins or other spin-forbidden processes on other chromophores, become spin-allowed and may perturb spectra and excited statephotochemistry. In neutral dimers, some doubly excited states are quite low lying, and it is possibly for one of these to constitute the lowest lying spin-allowed excited state. In dimer radical ions, a (possibly quite intense) band is generally expected to lie very close to thetriplet absorption energy of each isolated monomer. Particular examples are considered, as well as a model system consisting of an ethylenedimer in a stacked configuration typical of that found in large pi-systems such as the primary electron donor in the photosynthetic reaction centre, stacked phthalocyanines, acene dimers, stretched norbornadiene-type systems, etc. The results apply more generally than this, however, being relevant to all weakly interacting molecular or inorganic systems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 15:04:56