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

단핵 및 이핵성 시프염기리간드 Cu(II) 착물의 특성과 Ascorbic Acid에 대한 산화반응

  • 김선덕 (대구대학교 자연과학대학 화학과) ;
  • 이영석 (대구대학교 자연과학대학 화학과) ;
  • 박정은 (대구대학교 자연과학대학 화학과)
  • Received : 2000.03.31
  • Published : 2000.10.25

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 $Cu(II)_2$-TSDB and $Cu(II)_2$-TSTM were used in the oxidation reaction of ascorbic acid. The reaction rates were in the order of $Cu(II)_2$-TSTM>$Cu(II)_2$-TSDB>Cu(II)-BSPD, indicating that the binuclear $Cu(II)_2$-TSTM complex had the fastest values.

Keywords

proton dissociation constant;oxidation reaction;ascorbic acid

Acknowledgement

Supported by : 대구대학교

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