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Titolo:
The role of cellulose acetate as a matrix for aggregation of pseudoisocyanine iodide: absorption and emission studies
Autore:
de Barros, RB; Ilharco, LM;
Indirizzi:
Inst Super Tecn, Ctr Quim Fis Mol, P-1049001 Lisbon, Portugal Inst Super Tecn Lisbon Portugal P-1049001 ol, P-1049001 Lisbon, Portugal
Titolo Testata:
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
fascicolo: 9, volume: 57, anno: 2001,
pagine: 1809 - 1817
SICI:
1386-1425(200108)57:9<1809:TROCAA>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMER-FILMS; CYANINE DYES; RELAXATION; INTERFACE; EXCITONS; DYNAMICS; LAYERS; AFM;
Keywords:
pseudoisocyanine iodide; cellulose acetate; J-aggregates;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Ilharco, LM Inst Super Tecn, Ctr Quim Fis Mol, Complexo 1,Av Rovisco Pais,P-1049001 Lisbon, Portugal Inst Super Tecn Complexo 1,Av Rovisco Pais Lisbon Portugal P-1049001
Citazione:
R.B. de Barros e L.M. Ilharco, "The role of cellulose acetate as a matrix for aggregation of pseudoisocyanine iodide: absorption and emission studies", SPECT ACT A, 57(9), 2001, pp. 1809-1817

Abstract

Films of pseudoisocyanine iodide in a cellulose acetate matrix were prepared by spin coating and characterized by UV/Vis absorption and fluorescence spectroscopies. The comparison with self-supported films of the same dye enabled analysing the role of the matrix in the aggregation of pseudoisocyanine iodide ([PIC]I). It was proved that cellulose acetate is a suitable support for [PIC]I J-aggregates, which form during spinning, as shown by a verysharp J-band in the absorption spectra. This indicates a perfect coherencebetween stacked monomers in the supported J-aggregates. It was possible toindividualize the emission spectrum of [PIC]I J-aggregates in cellulose acetate, by decomposition of the steady-state fluorescence spectra of the films. The dependence on the excitation wavelength of the relative emission intensities of monomers and J-aggregates, for lambda (em) = 587 nm, lead to confirm that the latter species have an absorption maximum at similar to 500nm in cellulose acetate. Finally, polarised absorption spectra of films obtained by the vertical spin coating technique showed that cellulose acetateallows a partial orientation of J-aggregates. (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 20/09/20 alle ore 07:57:43