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http://dx.doi.org/10.5012/jkcs.2003.47.2.121

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

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)
Publication Information
Journal of the Korean Chemical Society / v.47, no.2, 2003 , pp. 121-126 More about this Journal
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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