Photoacoustic Measurements of Porphyrin Triplet-State Quantum Yields and Single...

• Author(s): Pineiro, Marta ; Carvalho, Ana L. ; Pereira, Mariette M. ; Gonsalves, A. M. d'A. Rocha ; Arnaut, Luís G. ; Formosinho, Sebastião J.
• Date: 1998
• Persistent ID: http://hdl.handle.net/10316/8247
• Origin: Estudo Geral - Universidade de Coimbra
• Document Type: Article
• Language: English

Description

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. http://dx.doi.org/10.1002/(SICI)1521-3765(19981102)4:11<2299::AID-CHEM2299>3.0.CO;2-H