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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Dual Emissions of Salicylidene-5-chloroaminepyridine Due to Excited State Intramolecular Proton Transfer: Dynamic Photophysical and Theoretical Studies

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Autor(es):
Germino, Jose Carlos [1] ; Barboza, Cristina Aparecida [1] ; Junior Quites, Fernando [2] ; Muniz Vazquez, Pedro Antonio [1] ; Zambon Atvars, Teresa Dib [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] State Univ Campinas UNICAMP, Inst Chem, Campinas, SP - Brazil
[2] Fed Univ Mato Grosso UFMT, Inst Exact & Earth Sci, Dept Chem, Cuiaba - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Physical Chemistry C; v. 119, n. 49, p. 27666-27675, DEC 10 2015.
Citações Web of Science: 10
Resumo

In this study, the photophysical properties of Nsalycilidene-5-chloroaminopyridine were evaluated. This molecule presented dual emission from the keto{*} and enol{*} species, depending on the solvent used (DMSO or methanol in the absence and presence of trifluoroacetic acid). This molecule was synthesized through a dehydration reaction of salicylaldehyde under sonication and characterized using FTIR, cyclic voltammetry, mass spectrometry, and single-crystal X-ray diffraction, yielding the molecular structure. Theoretical calculations were performed under the DFT framework and its time-dependent counterpart. Our results suggest the occurrence of excited state proton transfer, ESIPT, in the aprotic solvent, leading to a keto{*}-enol{*} balance, which is confirmed by the emission bands observed at 425 and 545 nm, respectively. However, in a protic environment (methanol or DMSO with trifluoroacetic acid), only the enol form is emissive due to the hydrogen bonding between the iminic group and the solvent. Molecules with double emissions are potentially useful for white light emitting diodes. (AU)

Processo FAPESP: 13/16245-2 - Propriedades fotofísicas de filmes finos de polímeros conjugados
Beneficiário:Teresa Dib Zambon Atvars
Modalidade de apoio: Auxílio à Pesquisa - Regular