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Titolo:
PHOTOINDUCED PROTONATION OF AZO DYES IN HALOGENATED SOLVENTS AND POLYMERS
Autore:
BLANCHARD PM; GILBERT A; MITCHELL GR;
Indirizzi:
UNIV READING,CTR POLYMER SCI READING RG6 2AF BERKS ENGLAND UNIV READING,CTR POLYMER SCI READING RG6 2AF BERKS ENGLAND
Titolo Testata:
Journal of materials chemistry
fascicolo: 10, volume: 3, anno: 1993,
pagine: 1015 - 1018
SICI:
0959-9428(1993)3:10<1015:PPOADI>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Keywords:
AZOBENZENE; PROTONATION; PHOTOCHEMISTRY; NONLINEAR OPTICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
10
Recensione:
Indirizzi per estratti:
Citazione:
P.M. Blanchard et al., "PHOTOINDUCED PROTONATION OF AZO DYES IN HALOGENATED SOLVENTS AND POLYMERS", Journal of materials chemistry, 3(10), 1993, pp. 1015-1018

Abstract

We show that protonation and/or photocyclisation of azo dye molecules, which are often used as chromophores for applications in non-linear optics, can be induced by optical irradiation either in solution or inpolymer films. irradiation causes dissociation of halogenated solvents or polymers, generating an acid which then protonates the dye molecule. In guest-host polymer systems consisting of azo dyes in halogenated polymers this type of protonation is shown also to result from the application of an electric field during the poling required for second-order applications. In both halogenated and non-halogenated systems a relatively slow bleaching process has been observed and attributed to photoinduced 6pi-cyclisation of the azo dye. We investigate the conditions under which protonation or cyclisation of azobenzenes occurs and identify the form of the protonated molecule.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 11:39:29