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1 February 2003 Photochemistry and Photophysics of Thienocarbazoles
J. Seixas de Melo, L. M. Rodrigues, C. Serpa, L. G. Arnaut, I. C F. R. Ferreira, M-J. R. P. Queiroz
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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 absorption spectra, triplet molar absorption coefficients, triplet lifetimes, intersystem crossing S1 ∼∼→ T1 and singlet molecular oxygen yields were obtained for the thienocarbazoles. In the case of the thienocarbazoles it was found that the lowest-lying singlet and triplet excited states, S1 and T1, are of π,π* origin, whereas for their precursors S1 is n,π*, and T1 is π,π*. In both thienocarbazoles it appears that the thianaphthene ring dictates the S1 ∼∼→ T1 yield, albeit there is less predominance of that ring in the triplet state of the linear thienocarbazole, which leads to a decrease in the observed ϕT value.

J. Seixas de Melo, L. M. Rodrigues, C. Serpa, L. G. Arnaut, I. C F. R. Ferreira, and M-J. R. P. Queiroz "Photochemistry and Photophysics of Thienocarbazoles," Photochemistry and Photobiology 77(2), 121-128, (1 February 2003).<0121:PAPOT>2.0.CO;2
Received: 2 July 2002; Accepted: 1 November 2002; Published: 1 February 2003

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