Acid-base properties of N-methyl-substituted 1,2-dihydroquinolines in the ground and excited states |
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| Authors: | O. N. Lygo T. D. Nekipelova E. N. Khodot |
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| Affiliation: | 1.Emanuel Institute of Biochemical Physics,Russian Academy of Sciences,Moscow,Russia;2.Zelinsky Institute of Organic Chemistry,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Changes in the absorption and fluorescence spectra of 1,2,2,3-tetramethyl-(1), 1,2,2,4-tetramethyl-(2), 6-ethoxy-1,2,2,4-tetramethyl-(3), and 1,2,6-trimethyl-1,2-dihydroquinolines (4) were studied in aqueous solution over a wide pH range from 1.0 to 12.0. The quantum yields of fluorescence and the values of pK a of dihydroquinolines (DHQs) under study in the ground and excited states were determined, pK a = 4.5, 3.8, 4.5, and 4.2 for the ground state of compounds 1–4, respectively, and pK a ∼ 1.7 for the S 1* state for all DHQs. |
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