Polarographic behaviour of salicylaldehyde-2-pyridylhydrazone and its copper(II) complex |
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Authors: | Ali Z. Abu Zuhri Maher A. Abu-Eid Jamal S. Shalabi |
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Affiliation: | (1) Chemistry Department, An-Najah National University, Nablus, West Bank, Via Israel |
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Abstract: | The polarographic behaviour of salicylaldehyde-2-pyridylhydrazone (SAPH) has been studied in aqueous buffer solution containing 40% ethanol using DC and DP polarographic methods. In the pH range 1.8–7.5 the observed single irreversible reduction wave is assigned to the splitting of the N-N bond and reduction of C=N centre. In alkaline medium, a second wave appears at a more negative potential due to the reduction of the salicylaldehyde which is formed by hydrolytic decomposition of the SAPH molecule. The effect of pH on the limiting current andE1/2 as well as the reduction mechanism are discussed and compared with similar compounds. The kinetic parameters of the electrode reaction have been calculated.The analytical properties of the copper(II)-SAPH system is described. The complex gave rise to a single irreversible well-defined wave (E1/2=–0.58 V at pH=5.2). The reaction process is diffusion controlled. A method is suggested for the determination of Cu(II) in presence of different metal ions as the difference in theirE1/2 values is sufficient for the purpose.This work is taken partly from the M. Sc. Thesis of Jamal S. Shalabi |
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Keywords: | polarography salicylaldehyde-2-pyridylhydrazone Cu(II) complex |
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