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Stability of Tris(2-cyclohexylaminoethyl)amine-Zn(II) Complex

Tris(2-cyclohexylaminoethyl)amine-Zn(II) 착물의 안정성

  • Yong Woon Shin (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang Nation University) ;
  • Hyun Sook Baek (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang Nation University) ;
  • Jae-Kyung Yang (Laboratory of Forest Chemistry. Faculty of Forest Science, Gyeongsang National University) ;
  • Jineun Kim (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang Nation University) ;
  • Moo Lyong Seo (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang Nation University)
  • 신용운 (경상대학교 화학과 및 기초과학연구소) ;
  • 백현숙 (경상대학교 화학과 및 기초과학연구소) ;
  • 양재경 (경상대학교 산림과학부) ;
  • 김진은 (경상대학교 화학과 및 기초과학연구소) ;
  • 서무룡 (경상대학교 화학과 및 기초과학연구소)
  • Published : 2003.04.20

Abstract

Tris(2-cyclohexylaminoethyl)amine (L) was synthesized by the Schiff base condensation reaction of tris(2-aminoethyl)amine with cyclohexanone, followed by reduction. The thermodynamic characteristics, mole ratio and formation constant of [Zn(II)-L] complex were measured by the cyclic voltammetry and isothermal titration. In the case of Zn(II), well-defined cathodic and anodic peak were obtained at -1.02V and -0.48V vs Ag/AgCl , respectively. For the [Zn(II)-L] complex, both peaks were obtained at -1.19V and -0.45V vs Ag/AgCl, respectively. In addition, the peak height gradually increases as the scan rate increases, suggesting that the currents obtained were diffusion - controlled. The mole ratio and stability constant of the complex measured cyclic voltammerty were 1:1 and logK$_f$= 5.8, respectively. And the mole ratio and stability constant of the complexe calculated by isothermal titration method was 1:1 and logK =5.4, respectively. ${\Delta}$H, ${\Delta}$G and T${\Delta}$S for the complex formation were -53.0 kJ/mol, -31.1 kJ/mol, and -21.9 J/K at 25 ${\circ}$C, respectively.

Keywords

Tris(2-cyclohexylaminoethyl)amine;Tris(2-cyclohexylaminoethyl)amine-Zn(II)Complex

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