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ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 47, Number 2
JKCSEZ 47(2)
April 20, 2003 |
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Title |
Stability of Tris(2-cyclohexylaminoethyl)amine-Zn(II) Complex
Tris(2-cyclohexylaminoethyl)amine-Zn(II) 착물의 안정성
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Author |
Yong Woon Shin, Hyun Sook Baek, Jae-Kyung Yang, Jineun Kim, Moo Lyong Seo
신용운, 백현숙, 양재경, 김진은, 서무룡
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Keywords |
Tris(2-cyclohexylaminoethyl)amine, Tris(2-cyclohexylaminoethyl)amine-Ze(II) 착물
, Tris(2-cyclohexylaminoethyl)amine, Tris(2-cyclohexylaminoethyl)amine-Zn(II) Complex
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Abstract |
Cyclohexanone,과 tris(2-aminoethyl)amine을 이용하여 Schiff 연기 축합반응으로 tren의 유도체인 tris(2-cyclohexylaminoethyl)amine (L)을 합성하였다. 또한 합성한 tren의 유도체인 tris(2-cyclohexylaminoethyl)amine (L)과 Zn(II) 착물의 열역학적 특성과 안정도 상수, Zn(II)와의 착물 조성비 등을 순환전압전류법과 열량계법으로 측정하였다. Zn(II)과 [Zn(II)-L] 순환전압전류 곡선을 0∼-1.5 V vs. Ag/AgCl의 가전압 범위에서 측정하였다. 금속인 경우, -1.02V와 -0.48V vs. Ag/AgCl에서 각각 환원피이크와 산화피이크가 나타났으며, 금속착물인 경우에는 -1.19V와 -0.45V vs. Ag/AgCl에서 각각 환원피이크와 산화피이크가 나타났다. 또한 피이크 전류(IP)는 주사속도의 평방근 (v1/2)에 비례하였으며 이것은 전류의 유형이 확산 지배적인 전류임을 나타낸다. 그리고 [Zn-L] 착물에 대해서 전압전류법적으로 구한 안정도상수는 logKf = 5.8, 결합비는 1:1을 나타내었다. 또한 열량계법적으로 [Zn-L] 착물의 열역학적 파라메타를 조사한 결과, 리간드 L과 Zn(II)는 1:1의 4 배위수를 가지는 착물을 이룬다는 것을 알 수 있었고, 이때 25 oC에서 logK=5.4, DH= -53.0 kJ/mol, DG의 값은 -31.1 kJ/mol이었으며 TDS는 -21.9 J/K·mole이었다.
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 logKf = 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. DH, DG and TDS for the complex formation were -53.0 kJ/mol, -31.1 kJ/mol, and -21.9 J/K at 25 oC, respectively.
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