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Ion-Selective Electrodes Based on Surface-Active Ionophores

基于表面活性离子载体的离子选择性电极

基本信息

批准号：
09640716
负责人：
TOHDA Koji
金额：
$ 2.05万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640716/
关键词：
Molecular orientation Phase boundary potential surface activity Detection limit Resonant optical second harmonic generation (resonant optical SHG)SHG active complex cation liquid liquid interface イオン選択的電荷分離共鳴第二高調波発生法 14-クラウン-4 誘導体

项目摘要

Resonant optical second-harmonic generation (resonant optical SHG) at the interfaces between aqueous sample solutions and liquid membranes, based on ionophores with different surface activities was measured in order to investigate the influence of the surface activity of ionophores on ion-selective charge separation. As ionophores with different surface activities, but bearing the same crown ether moiety as a binding site for the NaィイD1+ィエD1 ion, 4'-(p-octadecylbenzoateazo)phenoxymethyl-15-crown-5 (1) and 4'-(p-methylbenzoateazo)phenoxymethyl-15-crown-5 (2) were synthesized. The dependence of the SHG intensities on the polarization angle of the incident laser light showed that the average molecular orientations of ionophores 1 and 2 at the liquid/liquid interface were nearly equal to each other. When the concentration of NaィイD1+ィエD1 ion in the aqueous sample solutions increased, increases in the SHG intensities were observed for both membranes based on ionophores 1 and 2. However, the SHG intensities based on ionophore 1 were stronger, suggesting that the surface activity of ionophore 1 is higher than that of ionophore 2. The change in the phase boundary potentials of the ionophore 1-based membrane in contact with the aqueous NaィイD1+ィエD1 ion solutions was found to be larger than that of ionophore 2. An improvement in the potentiometric detection limit for NaィイD1+ィエD1 ion was also shown for membranes based on surface-active ionophore 1. These results demonstrate that the extent of charge separation at the liquid/liquid interface, as observed by resonant SHG from primary ion complexes, is increased by using surface-active ionophores.

为了研究离子载体的表面活性对离子选择性电荷分离的影响，测量了不同表面活性的离子载体在水溶液和液膜界面上产生的共振光学二次谐波（谐振光学SHG）。作为具有不同表面活性的离子载体，我们合成了4'-（对十八烷基苯甲酸乙二氮偶氮）phenoxymethyl-15-crown-5(1)和4'-（对甲基苯甲酸乙二氮偶氮）phenoxymethyl-15-crown-5(2)。结果表明，离子载体1和离子载体2在液/液界面处的平均分子取向几乎相等。当样品水溶液中Na - γ + γ - γ离子浓度增加时，离子载体1和离子载体2膜的SHG强度均增加。而基于电离层1的SHG强度更强，说明电离层1的表面活性高于电离层2。离子载体1基膜与Na + γ + γ离子溶液接触时相边界电位的变化大于离子载体2基膜。基于表面活性离子载体1的膜的电位检测限也有所提高。这些结果表明，在液/液界面上的电荷分离程度，正如从原生离子配合物中观察到的共振SHG，通过使用表面活性离子团增加了。