Conclusions
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1.
The absorption and fluorescence spectra have shown that, depending on the pH of the medium, the 7-azaindolines can exist in an anionic, cationic, and a neutral form. Protonation of the pyridine nitrogen atom leads to the formation of the σ, π* state, an increase in the lifetime of the S1 (π, π*) state, and to the possibility of photodissociation through this state.
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2.
In an alkaline medium the adiabatic photodissociation of 7-azaindolines takes place according to an acid mechanism, leading to the formation of an anion in the excited state.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimiya, No. 12, pp. 2717–2723, December, 1983.
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Dvornikov, A.S., Malkin, Y.N. & Kuz'min, V.A. Acid-base properties of 7-azaindolines. Russ Chem Bull 32, 2437–2441 (1983). https://doi.org/10.1007/BF00954470
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DOI: https://doi.org/10.1007/BF00954470