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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,
S. D., Lee,
Y. S., &
Park,
J.
E.
(2000). Properties of Mononuclear and Binuclear Cu(II) Schiff Base Complexes and Oxidation of Ascorbic Acid. Analytical Science and Technology, 13(5), 558-564.
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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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