Photoacoustic Measurements of Porphyrin Triplet-State Quantum Yields and Singlet-Oxygen Efficiencies

• Autor(a) principal: Pineiro, Marta
• Data de Publicação: 1998
• Outros Autores: Carvalho, Ana L., Pereira, Mariette M., Gonsalves, A. M. d'A. Rocha, Arnaut, Luís G., Formosinho, Sebastião J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/8247; https://doi.org/10.1002/(SICI)1521-3765(19981102)4:11<2299::AID-CHEM2299>3.0.CO;2-H

Photoacoustic calorimetry and luminescence techniques were used to measure singlet oxygen quantum yields (PhiDelta) of selected 5,10,15,20-tetrakis(aryl)porphyrins and of the novel chlorin shown. The use of validated photoacoustic references removes some inconsistencies existing in the literature. Excitation of halogenated porphyrins produces high yields of long-lived triplet states that efficiently transfer their energy to singlet oxygen. A route for red-absorbing, efficient singlet-oxygen photosensitisers is described.