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Triplet-State and Singlet Oxygen Formation in Fluorene-Based Alternating Copoly...
Fonseca, S. M.; Pina, J.; Arnaut, L. G.; Melo, J. Seixas de; Burrows, H. D.; Chattopadhyay, N.; Alcácer, L.; Charas, A.; Morgado, J.; Monkman, A. P.Data are reported on the triplet states of a series of fluorene-based A-alt-B type alternating copolymers based on pulse radiolysis-energy transfer and flash photolysis experiments. From the pulse radiolysis experiments, spectra are given for eight copolymers involving phenylene, thiophene, benzothiadiazole, and oligothienylenevinylene groups. Quantum yields for triplet-state formation (ΦT) have been obtained b...
Photochemistry and photophysics of thienocarbazoles
Melo, J. Seixas de; Rodrigues, L.M.; Serpa, C.; Arnaut, L.G.; Ferreira, Isabel C.F.R.; Queiroz, Maria João R.P.Two methylated thienocarbazoles and two of their synthetic nitro-precursors have been examined by absorption, luminescence, laser flash photolysis and photoacoustic techniques. Their spectroscopic and photophysical characterization involves fluorescence spectra, fluorescence quantum yields and lifetimes, and phosphorescence spectra and phosphorescence lifetimes for all the compounds. Triplet–singlet difference ...
Triplet state dynamics on isolated conjugated polymer chains
Burrows, H. D.; Seixas de Melo, J.; Serpa, C.; Arnaut, L. G.; Miguel, M. da G.; Monkman, A. P.; Hamblett, I.; Navaratnam, S.http://www.sciencedirect.com/science/article/B6TFM-46MD9J0-5/1/ad58ae25c92bd62f507ea5a6a04f467d
The intersecting-state model: a link between molecular spectroscopy and chemica...
Arnaut, L. G.; Pais, A. A. C. C.; Formosinho, S. J.The intersecting-state model is applied to calculate the energy barriers and rates of atom transfers, SN2 reactions, proton transfers and electron transfers, including electron transfer at the metal-electrolyte interface. The calculated rates are usually within one order of magnitude of the experimental ones. These applications of the model reveal the main factors that influence the rates of these chemical reac...
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