Protolytic Equilibria of Some N,N-Bis(2-carboxyethyl)aminoazobenzenesulfonic Acids in Aqueous Solution |
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| Authors: | Skorik Yu A Neudachina L K Osintsev A V Yatluk Yu G Vshivkov A A Osintseva E V |
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| Institution: | (1) Gor'kii Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia;(2) Institute of Organic Synthesis, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 20, Yekaterinburg, 620219, Russia;(3) Institute of Metallurgy, Ural Division, Russian Academy of Sciences, Yekaterinburg, Russia |
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| Abstract: | 4-4-Bis(2-carboxyethyl)aminophenylazo]benzenesulfonic acid and 4-2-bis(2-carboxyethyl)amino-4,5-dimethylphenylazo]benzenesulfonic acid were synthesized for the first time by azo coupling of diazosulfanilic acid with N,N-bis(2-carboxyethyl)aniline and N,N-bis(2-carboxyethyl)-3,4-xylidine, respectively. The acid ionization constants of the products were determined, their electron absorption spectra were measured, and schemes of acid-base equilibria in aqueous solution were proposed. |
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