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Spectrophotometric and conductometric studies of new synthesized azo derived from pyrazole as analytical reagents

F. A. El-Seify, F. I. El-Dossoki, and Mahmoud M. Gouda

Chemistry Department, Faculty of Engineering, Port Said University, Port Said, Egypt



Received: 12 April 2021  Accepted: 23 June 2021


A new pyrazole derivatives azo dye 1-(3-phenyl-5-Pyrazolylazo)-R acid (L1) and 5-(3-phenyl-5-Pyrazolylazo)-8-hydroxy quinoline (L2) was synthesized. The acid–base equilibrium, ionization constants, the effect of pH and some organic solvents on the spectra of ligands, the chromogenic reaction and the stability constant of Co+2, Cu+2,Ni+2 and Zn+2 ion complexes with ligands were studied and determined spectrophotometrically and conductometrically. The optimum pH was determined for the ligands and the complexes. 2:1 and 1:1 (L:M) stoichiometric complexes have been formed in solutions. The stability constants order of the under study complexes was Co+2 < Ni+2 < Cu+2. These metal ions were determined using the ligands as indicators. The reagents can be also useful to use as indicators in acid–base titrations as confirmed experimentally.

Keywords: Spectrophotometrically; Conductometrically; Pyrazole derivatives; Acid–base indicators

Full paper is available at

DOI: 10.1007/s11696-021-01753-1


Chemical Papers 75 (11) 5917–5927 (2021)

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