Chloride transfer across the liquid-liquid interface facilitated by a mono-thiourea as a hydrogen-bonding ionophore
Chloride transfer across the liquid-liquid interface facilitated by a mono-thiourea as a hydrogen-bonding ionophore
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DOI：
10.1246/bcsj.74.2343
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发表时间：
2001-12-01
影响因子：
4
通讯作者：
Teramae, N
中科院分区：
文献类型：
--
作者：
Nishizawa, S;Yokobori, T;Teramae, N
本文报道了硫脲基氢键型离子载体2，N，N ′-双（对硝基苯基）硫脲在电流型阴离子传感器中的应用。用离子转移极谱法研究了该离子载体促进的氯离子在硝基苯（NB）-水界面的转移。当2存在于有机相中时，可以观察到一个明确的波，表明2通过形成氢键促进了NB-水界面上的氯离子转移。离子转移极谱图分析表明，氯化物转移是由2与氯化物之间的1：1络合作用促进的，并且转移过程是可逆的，并受2从体相NB向界面的扩散控制。尽管其基于两点相互作用的简单结合模式，但单硫脲2具有强的促进氯离子转移的能力，这与高度预组织的双硫脲离子载体1，2，7-二叔丁基-4，5-双（N '-丁基亚硫脲基）-9，9-二甲基氧杂蒽（其中四个氢键参与氯离子结合）所获得的能力相当。
Applicability of a thiourea-based hydrogen-bonding ionophore 2, N,N'-bis(p-nitrophenyl) thiourea, for amperometric anion sensors is presented. Chloride transfer across the nitrobenzene (NB)-water interface facilitated by this ionophore is studied by using ion transfer polarography. When 2 is present in the organic phase, a well-defined wave can be observed, indicating that the chloride transfer across the NB-water interface is facilitated by 2 via formation of hydrogen bonds. The analysis of ion transfer polarograms; shows that the chloride transfer is assisted by 1: 1 complexation between 2 and chloride, and that the transfer process is reversible and controlled by diffusion of 2 from the bulk NB phase to the interface. Despite its simple binding mode based on two point interactions, mono-thiourea 2 has a strong ability to facilitate chloride transfer, which is comparable to that obtained for a highly preorganized bis-thiourea ionophore 1, 2,7-di-t-butyl-4,5-bis(N'-butylthioureylene)-9,9-dimethylxanthene, in which four hydrogen bonds are involved in the chloride binding.