Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Electrochemical Study of Nickel(II) Complexes with Diaza-Macrocyclic Ligands in Acetonitrile

  • Moo-Lyong Seo (Department of Chemistry, Gyeongsang National University) ;
  • Zun-Ung Bae (Department of Chemistry, Kyungpook National University) ;
  • Tae-Myoung Park (Department of Chemistry, Gyeongsang National University)
  • Published : 1991.08.20
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Abstract

The electrochemical behavior and the complex formation between N$i^{2+}$ and 1,7-diazs-15-crown-5 and 1,10-diaza-18-crown-6 in acetonitrile solution have been studied by DC polarography, differential puke polarography and cyclic voltammetry. Nickel(Ⅱ) complexes gave a single well-defined wave. The formation constants of their complexes were 1$0^{4.89} and 10^{3.86}$, respectively. Nickel(Ⅱ) ion was found to form complexes of 1-to-1 composition with 1,7-diaza-15-crown-5 and 1,10-diaza-18-crown-6. In addition, reduction steps were irreversible and the reduction current were diffusion controlled. The electrochemical reduction mechanism of Ni(Ⅱ)-macrocyclic diaza-crown complexes in acetonitrile solution is estimated.

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