Photo-regenerable surface with potential for optical sensing
Photo-regenerable surface with potential for optical sensing
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DOI：
10.1039/b516400a
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发表时间：
2006-01-01
影响因子：
--
通讯作者：
Diamond, D
中科院分区：
文献类型：
--
作者：
Byrne, RJ;Stitzel, SE;Diamond, D
使用具有不同链长（2，4，6，8亚甲基）的烷基二胺偶联剂将光致变色螺吡喃共价固定到光学透明的聚合物表面上。相对非极性和无色的螺吡喃形式可以分别使用UV和可见光可逆地转换为带电的、高度着色的两性离子mercury异构体。汞与金属离子形成络合物，这导致吸收光谱的移动，并观察到相应的颜色变化。在用可见光照射复合物时，阳离子被释放，并且汞（活性）异构体恢复为螺吡喃（被动）形式。聚合物结合的螺吡喃-汞系统的光开关和络合行为高度依赖于螺吡喃从聚合物表面的系链长度。使用氯化钴（II）溶液证明了该效果。
Photochromic spiropyran was covalently immobilized using alkyldiamine couplers with varying chain length (2, 4, 6, 8 methylene groups) onto an optically transparent polymeric surface. The relatively nonpolar and colourless spiropyran form can be reversibly switched to a charged, highly coloured, zwitterionic merocyanine isomer using UV and visible light, respectively. The merocyanine form complexes with metal ions, and this results in a shift in the absorbance spectrum, and a corresponding colour change is observed. Upon irradiation of the complex with visible light, the cation is released and the merocyanine (active) isomer reverts back to the spiropyran (passive) form. Optical switching and complexation behaviour of the polymer-bound spiropyran-merocyanine system is highly dependent on the tether length of the spiropyran from the polymeric surface. The effect is demonstrated using cobalt(II) chloride in solution.