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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Properties of Mononuclear and Binuclear Cu(II) Schiff Base Complexes and Oxidation of Ascorbic Acid

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2000, v.13 no.5, pp.558-564
Kim, Sun Deuk
Lee, Young Seuk
Park, Jung Eun
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Abstract

Mononuclear schiff base ligand N,N'-bissalicylidene-1,2-phenylenediamine(BSPD) and binuclear schiff base ligands N,N',N',N'''-tetrasalicylidene-3,3',4,4'-tetraaminodiphenyl-methane (TSTM), N,N',N'',N'''-tetrasalicylidene-3,3'-diaminobenzidine (TSDB) have been synthesized. Proton dissociation constants of the ligands were determined by potentiometric method. The synthesized ligands and complexes formed with Cu(II) ion. These complexes were investigated by cyclic voltammetry and differential pulse voltammetry. The results revealed two step diffusion controlled redox process. The mononuclear complex Cu(II)-BSPD and binuclear complexes <TEX>$Cu(II)_2$</TEX>-TSDB and <TEX>$Cu(II)_2$</TEX>-TSTM were used in the oxidation reaction of ascorbic acid. The reaction rates were in the order of <TEX>$Cu(II)_2$</TEX>-TSTM><TEX>$Cu(II)_2$</TEX>-TSDB>Cu(II)-BSPD, indicating that the binuclear <TEX>$Cu(II)_2$</TEX>-TSTM complex had the fastest values.

keywords
proton dissociation constant, oxidation reaction, ascorbic acid


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