Protolytic Properties of Thiofluorescein and Its Derivatives |
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| Authors: | Mchedlov-Petrosyan N. O. Vodolazkaya N. A. Martynova V. P. Samoilov D. V. El'tsov A. V. |
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| Affiliation: | (1) Karazin Kharkov National University, Kharkov, Ukraine;(2) St. Petersburg State Institute of Technology, St. Petersburg, Russia |
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| Abstract: | Ionization constants of thiofluorescein, 4-nitro-, 4,5-dinitro-, 2,4,5,7-tetrabromo-, and 2,4,5,7-tetraiodothiofluoresceins, and also of 4,5-dibromofluorescein and N-ethyl-4,5-dinitroazafluorescein in 50 wt % aqueous ethanol have been determined. The electronic absorption spectra of their ionic and molecular forms have been recorded and analyzed. The behavior of these dyes can be described in terms of the scheme of prototropic equilibria proposed previously for fluorescein and its halo derivatives. |
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