Effect of solvent on the subnanosecond decay of the second excited singlet state of tetramethylindanethione |
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| Authors: | A Maciejewski R P Steer |
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| Institution: | Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0 |
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| Abstract: | The S2 → S0 fluorescence spectra and quantum yields and the S2 lifetimes of 2,2,3,3-tetramethylindanethione (TMIT) have been measured in several solvents using a synchronously pumped picosecond dye laser excitation system. The S2 nonradiative decay rate is markedly solvent dependent. In inert perfluoroalkane solvents remarkably large S2-S0 fluorescence quantum yields (θf = 0.14) and long S2 lifetimes (τ = 880 ps) are measured. Hydrocarbons are efficient excited-state quenchers. |
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