Add time:09/05/2019         Source:sciencedirect.com

The protonation of 2- and 3-nitrophenol (NO2 Ph) and 2,X and 3,Y dihydroxybenzoic acids (DBA, X = 4,5,6; Y = 4,5) has been studied potentiometrically in aqueous tetraethylammonium iodide solutions, at T = 25° in the ionic strength range 0.05:5 ≤ I ≤ 1M. Besides the species reported in the literature, we have also found some dimeric species of 2,4-DBA and 2,5-DBA. Also for this type of ligand, a simple equation for the dependence on ionic strength of protonation constants, already proposed for several inorganic and organic acids, has been used successfully. Moreover the behavior of protonation constants as a function of I can give information about the formation of polymeric species.

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