Potential photoresponse of membranes containing a lipophilic crowned spirobenzopyran
Potential photoresponse of membranes containing a lipophilic crowned spirobenzopyran
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含有亲脂性冠螺苯并吡喃的膜的潜在光响应
DOI：
10.1039/a904897i
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Mutsuo Tanaka
中科院分区：
文献类型：
--
作者：
K. Kimura;Shinpei Kado;H. Sakamoto;A. Sakai;M. Yokoyama;Mutsuo Tanaka
研究了含亲脂冠状螺苯并吡喃的塑化聚氯乙烯膜的电位响应和光响应，并与不含冠醚部分的螺苯并吡喃衍生物的膜系统进行了比较。在紫外光照射下，在碱金属离子存在下，冠螺苯并吡喃体系的膜电位发生了一个有趣的时间过程变化，即电位先升高后降低。冠状螺苯吡喃体系的光响应曲线受金属离子种类和水相pH条件的影响较大。这种现象可以用冠螺苯并吡喃特有的离子交换机制来解释，即快速质子交换之后是其merocyanine形式的缓慢金属离子交换。相应的无冠醚部分的螺苯并吡喃体系表现出稳定的光响应电位，这取决于水相的pH条件。
Potential response and its photoresponse for plasticized-poly(vinyl chloride) membranes containing a lipophilic crowned spirobenzopyran were surveyed and compared with those for membrane systems of a spirobenzopyran deriative not carrying any crown ether moiety. On UV-light irradiation, an intriguing type of time-course change was found with the membrane potential for the crowned spirobenzopyran system in the presence of alkali metal ions, i.e., the potential first increases and then decreases. The photoresponse profile for the crowned spirobenzopyran system was affected considerably by the sort of metal ions and the pH conditions of aqueous phases. This phenomenon is explained by an ion-exchange mechanism specific to crowned spirobenzopyran, that is, fast proton exchange followed by slow metal-ion exhange of its merocyanine form. The system for the corresponding spirobenzopyran without crown ether moiety exhibited a steady potential photoresponse that depends on the pH conditions of aqueous phases.