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KMID : 1059519980420040422
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Journal of the Korean Chemical Society
1998 Volume.42 No. 4 p.422 ~ p.431
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Synthesis of Tridentate-Schiff Base Co(II) Complexes and Their Electrochemical Properties
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Chae Hee-Nam
Choi Yong-Kook
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Abstract
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Tridentate Schiff base ligands such as SIPH2, SIPCH2, HNIPH2, and HNIPCH2 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, 1HNMR, IR, UV-visible spectra, and thennogravimetric 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-coofdinated 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(Ⅱ)(HNIPC)(H2O)3] > [Co(Ⅱ)(HNIP)(H2O)3] > [Co(Ⅱ)(SIPC)(H2O)3] > [Co(Ⅱ)(SIP)(H2O)3], and their dependence on ligands were not so high.
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KEYWORD
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