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http://dx.doi.org/10.5012/jkcs.2006.50.2.099

Spectrophotometric, pH-metric and Conductometric Studies on Some 3-Arylhydrazone Derivatives of (2-Thenoyl) Ethylpyruvate)  

El-Dossoki, F. I. (Suez Canal University (Egypt))
El-Seify, F. A. (Suez Canal University (Egypt))
Publication Information
Journal of the Korean Chemical Society / v.50, no.2, 2006 , pp. 99-106 More about this Journal
Abstract
The electronic absorption spectra of [3-(2-thenoyl) 3-(p-NO2-phenylhydrazone) ethyl pyruvate] (I), p-Br (II) and p-CH3 (III) were studied in ethanol and the spectra comprise four absorption bands which assigned to the corresponding electronic transition. The pK values of these compounds have been determined spectrophotometrically and pH-metrically, the results shown that the interval range for color change of compound (I) is (8-10) similar to that of phenolphethalin indicator, indicating that this compound can be used as acid-base indicator. The successive stability constants of the compounds under study with some transition elements (Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), UO2(II), La(III) and Zr(IV) have been determined pH- metrically. Stoichiometric complexes with ratios 1:1 and 1:2 (M: L) were formed for all metals. The pK of the three derivatives and the values of the stability constant (logK) of the complexes have the order; III > II > I. Also conductometric titrations have been carried out and the results show that this titration can be used for determination of both the metal ion and the ligand concentrations by each others.
Keywords
Conductometric Titration; Acid-base Indicator; Pyruvate Derivatives
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