Advanced
Synthesis of Tridentate-Schiff Base Co(II) Complexes and Their Electrochemical Properties
Synthesis of Tridentate-Schiff Base Co(II) Complexes and Their Electrochemical Properties
Journal of the Korean Chemical Society. 1998. Aug, 42(4): 422-431
  • Published : August 00, 1998
Download
PDF
Export by style
Article
Author
Metrics
Cited by
About the Authors
Chae, Hui Nam
Choe, Yong Guk

Abstract
Tridentate Schiff base ligands such as $SIPH_2,\;SIPCH_2,\;HNIPH_2,\;and\; HNIPCH_2$ were prepared by the reaction of salicylaldehyde and 2-hydroxy-l-naphthaldehyde with 2-aminophenol and 2-amino-p-cresol. The structures and properties of ligands and their Co(II) complexes were investigated by elemental analysis, $^1H$NMR, IR, UV-visible spectra, and thermogravimetric analysis. The molar ratio of Schiff base to the metal of complexes was found to be 1:1. Co(II) complexes were contemplated to be hexa-coordinated octahedral configuration containing three water molecules. The redox process of ligands and complexes in DMSO solution containing 0.1 M TBAP as a supporting electrolyte were investigated by cyclic voltammetry with glassy carbon electrode. The redox process of the tridentate Schiff base ligands was totally irreversible. The redox process of Co(II) complexes were irreversible and one electron processes by two steps in diffusion controlled reaction. The reduction potential of the Co(II) complexes was shifted to the positive direction in the order [Co(��)$(HNIPC)(H_2O)_3$]>[Co(��)$(HNIP)(H_2O)_3$]>[Co(II)$(SIPC)(H_2O)_3$]>[Co(��)$(SIP)(H_2O)_3], and their dependence on ligands were not so high.