Photophysics of UV-excited Cl2CS in a perfluoroalkane solvent
- 1 January 1993
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 89 (17) , 3251-3256
- https://doi.org/10.1039/ft9938903251
Abstract
The quantum yields of fluorescence from UV-excited Cl2CS in inert perfluoroalkane solutions have been measured as a function of the analytical concentration of the solute in the range 5 × 10–5⩽C/mol dm–3⩽ 1, and as a function of excitation energy in the range 245 ⩽λex/nm ⩽ 330. The excited-state decay rates have also been measured at 272 ⩽λex/nm ⩽ 300 over the same concentration range. A quantitative description of the photophysics of the system has been achieved, which accounts for significant self-aggregation of the ground state solute at C > 10–4 mol dm–3, absorption by a nearby dark excited state of the monomer in the 285 ⩽λex/nm ⩽ 330 range, different lifetimes and rate constants of concentration quenching of the excited monomer and the excited dimer, and the excitation wavelength dependence of fluorescence-weakening non-radiative relaxation processes in each excited species.Keywords
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