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

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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@article{ JCGMDC_2003_v47n2_121} ,title={Stability of Tris(2-cyclohexylaminoethyl)amine-Zn(II) Complex} ,volume={2} , url={http://dx.doi.org/10.5012/jkcs.2003.47.2.121}, DOI={10.5012/jkcs.2003.47.2.121} , number= {2} , journal={Journal of the Korean Chemical Society} , publisher={Korean Chemical Society} , author={Yong Woon, Shin and Hyun Sook, Baek and Jae-Kyung, Yang and Jineun, Kim and Moo Lyong, Seo} , year={2003} , month={Apr}