Spectrophotometric study of the protonation processes of some indole derivatives in sulfuric acid | Zendy

Blagoja Andonovski | Zendy; Goran Stojković | Zendy

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Spectrophotometric study of the protonation processes of some indole derivatives in sulfuric acid

Author(s) -

Blagoja Andonovski,

Goran Stojković

Publication year - 1999

Publication title -

journal of the serbian chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.227

H-Index - 45

eISSN - 1820-7421

pISSN - 0352-5139

DOI - 10.2298/jsc9912775a

Subject(s) - protonation , chemistry , sulfuric acid , indole test , absorbance , dissociation (chemistry) , solvent , dissociation constant , inorganic chemistry , organic chemistry , chromatography , ion , biochemistry , receptor

The protonation of 3-methylindole, D-tryptophan, 3-formylindole, 3-acetylindole and indolyl-2-carboxylic acid in sulfuric acid media was studied by UV spectroscopy. The measurement of the absorbance at four selected wavelengths enabled the calculation of the correspondingmolar absorptivities. The results were used to calculate the pKa value of the protonated form of the indole derivatives by the Hammett Method. The Hammett postulate (the slope of the plot log [c(BH+)/c(B)]vs. H should be equal to 1) was tested. The dissociation constants and solvent parameterm*were also obtained by applying the Excess Acidity Method. The position of the additional protons in the protonated compounds is discussed.

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