Dynamics of carbocation formation in the photolysis of 1,2,2,3-tetramethyl-1,2-dihydroquinoline in alcohols |
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| Authors: | O N Lygo I V Shelaev F E Gostev T D Nekipelova E N Khodot V A Kuzmin O M Sarkisov |
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| Institution: | 1.Emanuel Institute of Biochemical Physics,Russian Academy of Sciences,Moscow,Russia;2.Semenov Institute of Chemical Physics,Russian Academy of Sciences,Moscow,Russia;3.Zelinsky Institute of Organic Chemistry,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Dynamics of the formation of the carbocation in the ground state as a result of photoinduced proton transfer from a solvent
to the excited state of 1,2,2,3-tetramethyl-1,2-dihydroquinoline (3MDHQ) in MeOH and 2,2,2-trifluoroethanol (TFE) was registered
by pump-probe laser photolysis (λpump = 310 nm) with femtosecond time resolution. The lifetimes of the excited singlet state of 3MDHQ τ = 115 and 780 ps were determined
in TFE and MeOH, respectively. The transient species with absorption spectrum corre-sponding to the spectrum of the carbocation
from 3MDHQ (λmax = 480 nm) is generated at time delays lower than 500 fs from the unrelaxed excited singlet state. |
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