Studying the intersystem crossing rate and triplet quantum yield of meso-substituted porphyrins by means of pulse train fluorescence technique

Autor(es)

Bezera de Souza, Tiago Gualberto ; Vivas, Marcelo Goncalves ; Mendonca, Cleber Renato ; Plunkett, Shane ; Filatov, Mikhail A. ; Senge, Mathias O. ; De Boni, Leonardo

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PORPHYRINS AND PHTHALOCYANINES; v. 20, n. 1-4, p. 10-pg., 2016-01-01.

Resumo

Excited state dynamics, particularly intersystem crossing, of a set of meso-substituted porphyrins bearing different electron-donor and acceptor groups was studied by pulse train fluorescence technique. Triplet quantum yield was found to be critically dependent on the nature of meso-substituents in the porphyrin system. Porphyrins with meso methoxyphenyl groups were found to show high triplet quantum yields (phi(T) between 0.70 and 0.81). Moreover, the quantity of methoxyphenyl groups and the substitution pattern directly influence phi(T). Alternatively, porphyrins attached to nitrophenyl group possess low triplet quantum yield values (similar to 0.3). The observed structure-properties relationships suggest new ways for tuning the optical properties of porphyrins via chemical modification. (AU)

• Processo FAPESP: 11/12399-0 - Aplicações de pulsos de femtossegundos em óptica não linear: espectroscopia, formatação de pulsos e microfabricação
• Beneficiário: Cleber Renato Mendonça
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/11810-8 - Estudo do efeito de solvente sobre os espectros da absorção de um e dois fótons de moléculas orgânicas conjugadas.
• Beneficiário: Daniel Luiz da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado