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Titolo:
Luminescence of poly(3-thiopheneacetic acid) in alcohols and aqueous solutions of poly(vinyl alcohol)
Autore:
de Souza, JM; Pereira, EC;
Indirizzi:
Univ Fed Sao Carlos, Dept Quim, Lab Interdisciplinar Electroquim & Ceram, BR-13560970 Sao Carlos, SP, Brazil Univ Fed Sao Carlos Sao Carlos SP Brazil BR-13560970 BCCarlos, SP, Brazil
Titolo Testata:
SYNTHETIC METALS
fascicolo: 1-3, volume: 118, anno: 2001,
pagine: 167 - 170
SICI:
0379-6779(20010301)118:1-3<167:LOPAIA>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUBSTITUTED POLY(THIOPHENES); THERMOCHROMIC PROPERTIES; POLYANILINE DISPERSIONS; POLYTHIOPHENE; POLYMER; POLY(3-HEXYLTHIOPHENE); POLY(3-ALKYLTHIOPHENE); ELECTROLUMINESCENCE; TEMPERATURE; NETWORKS;
Keywords:
luminescence; solvatochromism; poly(3-thiopheneacetic acid); polythiophene derivatives; poly(vinyl alcohol);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Pereira, EC Univ Fed Sao Carlos, Dept Quim, Lab Interdisciplinar Electroquim & Ceram, Caixa Postal 676, BR-13560970 Sao Carlos, SP, Brazil Univ Fed Sao Carlos Caixa Postal 676 Sao Carlos SP Brazil BR-13560970 BC
Citazione:
J.M. de Souza e E.C. Pereira, "Luminescence of poly(3-thiopheneacetic acid) in alcohols and aqueous solutions of poly(vinyl alcohol)", SYNTH METAL, 118(1-3), 2001, pp. 167-170

Abstract

Stable aqueous solutions of poly(3-thiopheneacetic acid) (PTAA), includingits acid form, were suitably prepared by using poly(vinyl alcohol) (PVA) as steric stabilizer surfactant. The optical properties of PTAA were investigated in aqueous solution of PVA, water and different alcohols. Both absorption and emission measurements revealed that the optical behavior of PTAA is pH-dependent. The maximum of absorption of PTAA salt in PVA solution shifts from 480 to 415 nm when acid conditions are established, producing a color change from brown-red to yellow. The same solvatochromic effect was alsoverified from the emission spectra, being the band shift attributed to conformational changes of the PTAA structure due to formation or dissociation of hydrogen bonds between carboxyl groups of PTAA and hydroxyl groups of PVA. In a similar way, the impact of solvents such as water, ethanol and ethylene glycol was also studied on both absorption and emission spectra of PTAA. (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 22/09/20 alle ore 14:24:04