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Polarographic Behaviour of ‎Salicylaldehyde-2-Pyridylhydrazone and ‎its Copper(II) Complex

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Wed, 2014-03-26 13:02 — Maher An-Natsheh
Journal Title, Volume, Page: 
Microchimica Acta, Volume 92, Issue 4-6, pp 153-161
Year of Publication: 
1987
Link: 
http://link.springer.com/article/10.1007%2FBF01201835
Authors: 
Maher A. Abu-Eid
Chemistry Department, An-Najah National University, P. O. Box 7, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
[email protected]
Jamal S. Shalabi
Chemistry Department, An-Najah National University, P. O. Box 7, Nablus, Palestine
Ali Z. Abu Zuhri
Chemistry Department, An-Najah National University, P. O. Box 7, Nablus, Palestine
Preferred Abstract (Original): 

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 andE 1/2 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 (E 1/2=−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 theirE 1/2 values is sufficient for the purpose.

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