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Spectrofluorimetric and Potentiometric Determination of Acidity Constants of 4-(4′-Acetyloxy-3′-Methoxybenzylidene)-5-Oxazolone Derivatives

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Abstract

4-(4′-acetyloxy-3′-methoxybenzylidene)-5-oxazolone fluorescent molecules bearing four different aryl groups attached to the 2-position of 5-oxazolone ring have been investigated by spectrophotometric and potentiometric techniques in solution media. The acidity constants (pKa) of the fluorescent molecules were precisely determined in acetone, acetonitrile, dimethylformamide and in 1:1 mixture of toluene-isopropanol. The studied derivatives were titrated with tetrabutylammonium hydroxide and non-aqueous perchloric acid by scanning the basic and acidic region of the pH scale. A computerizable derivative method was used in order to descript precisely the end point and pKa values. The molecules investigated performed well-shaped and stoichiometric potentiometric titration curves.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Sciences, Dokuz Eylul University, Tinaztepe Campus, 35160, Buca, Izmir, Turkey

    Derya Topkaya Taskiran, Gulsiye Ozturk Urut, Sevda Ayata & Serap Alp

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  1. Derya Topkaya Taskiran
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  2. Gulsiye Ozturk Urut
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  3. Sevda Ayata
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  4. Serap Alp
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Correspondence to Gulsiye Ozturk Urut.

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Taskiran, D.T., Urut, G.O., Ayata, S. et al. Spectrofluorimetric and Potentiometric Determination of Acidity Constants of 4-(4′-Acetyloxy-3′-Methoxybenzylidene)-5-Oxazolone Derivatives. J Fluoresc 27, 521–528 (2017). https://doi.org/10.1007/s10895-016-1979-9

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  • DOI: https://doi.org/10.1007/s10895-016-1979-9

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