title: Spectrofluorimetric and Potentiometric Determination of Acidity Constants of 4-(4'-Acetyloxy-3'-Methoxybenzylidene)-5-Oxazolone Derivatives.
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.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Dokuz Eylul University, Tinaztepe Campus, 35160, Buca, Izmir, Turkey.
authors.forename: Derya Topkaya
authors.initials: DT
authors.lastname: Taskiran
authors.affiliation: Department of Chemistry, Faculty of Sciences, Dokuz Eylul University, Tinaztepe Campus, 35160, Buca, Izmir, Turkey. gulsiye.ozturk@deu.edu.tr.
authors.forename: Gulsiye Ozturk
authors.initials: GO
authors.lastname: Urut
authors.affiliation: Department of Chemistry, Faculty of Sciences, Dokuz Eylul University, Tinaztepe Campus, 35160, Buca, Izmir, Turkey.
authors.forename: Sevda
authors.initials: S
authors.lastname: Ayata
authors.affiliation: Department of Chemistry, Faculty of Sciences, Dokuz Eylul University, Tinaztepe Campus, 35160, Buca, Izmir, Turkey.
authors.forename: Serap
authors.initials: S
authors.lastname: Alp
keywords: Acidity constant; Fluorescence; Oxazolones; Solution media; Titration