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Titolo:
Substituted stilbenes: a new view on well-known systems - New applicationsin chemistry and biophysics
Autore:
Papper, V; Likhtenshtein, GI;
Indirizzi:
Ben Gurion Univ Negev, Dept Chem, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel
Titolo Testata:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
fascicolo: 1, volume: 140, anno: 2001,
pagine: 39 - 52
SICI:
1010-6030(20010413)140:1<39:SSANVO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRAMOLECULAR CHARGE-TRANSFER; FLUORESCENCE QUANTUM YIELDS; PHOTOCHROME-LABELING METHOD; TIME-RESOLVED FLUORESCENCE; POLAR-SOLVENTS; TRANS-4,4'-DISUBSTITUTED STILBENES; PHOTOISOMERIZATION DYNAMICS; PHOTOCHEMICAL-REACTIONS; CIS PHOTOISOMERIZATION; TRANSIENT ABSORPTION;
Keywords:
stilbene; trans-cis photoisomerisation; cascade reaction; triplet-triplet energy transfer; fluorescence-photochrome technique; biomembrane dynamics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
69
Recensione:
Indirizzi per estratti:
Indirizzo: Likhtenshtein, GI Ben Gurion Univ Negev, Dept Chem, POB 653, IL-84105 BeerSheva, Israel Ben Gurion Univ Negev POB 653 Beer Sheva Israel IL-84105
Citazione:
V. Papper e G.I. Likhtenshtein, "Substituted stilbenes: a new view on well-known systems - New applicationsin chemistry and biophysics", J PHOTOCH A, 140(1), 2001, pp. 39-52

Abstract

In this review, we present new areas of application of stilbene compounds in chemistry and biophysics. The first is the application of the linear free-energy relationships (LFER) to photochemistry of substituted stilbenes. The second is the development of the fluorescence-photochrome technique for investigation of different dynamical processes in biological membranes and surface systems. The various time-scale processes occurring with the stilbene molecules after irradiation were found to exhibit different sensitivity to intramolecular donor-acceptor effects of substituents and medium polarity. The sensitivity is quantitatively characterised by p-constant of the linear Hammett-like relationships. The obtained experimental data on LFER has independently confirmed the Saltiel mechanism of the photoisomerisation andestablished the quantitative basis for detailed mechanistic analysis of the different stages of this important photochemical reaction. The measurements of the direct and sensitised trans-cis and cis-trans photoisomerisation allowed investigation the rotational and translational diffusion of the stilbene labels and their aromatic moieties labelled proteins in a wide temporal range. The cascade photochemical system based on the combination of the stilbene, triplet and nitroxide-spin probes gained an additional advantage to measure the rate constant of the triplet state quenching and to estimatethe local concentration of stable radicals. High sensitivity, validity andrelatively low cost of conventional fluorescence facilities are the main advantages of these fluorescent-photochrome methods. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 00:45:18