Metal Ionochromic Effects of Conjugated Polymers: Effects of the Rigidity of Molecular Recognition Sites on Metal Ion Sensing
Metal Ionochromic Effects of Conjugated Polymers: Effects of the Rigidity of Molecular Recognition Sites on Metal Ion Sensing
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DOI：
10.1021/jp034245k
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发表时间：
2003-06
影响因子：
3.3
通讯作者：
Ming Zhang;P. Lu;Yuguang Ma;Jia-cong Shen
中科院分区：
文献类型：
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作者：
Ming Zhang;P. Lu;Yuguang Ma;Jia-cong Shen
研究了芴基共轭聚合物 P1 和 P2 中分子识别位点的刚性对金属离子传感的影响。聚合物P1和P2的结构分别具有扭曲的2,2'-联吡啶和平面1,10-菲咯啉单元，它们与一个芴单体单元交替。研究发现，1,10-菲咯啉基聚合物 P2 暴露于金属离子后，其吸收和发射带可红移高达 30 nm，发射强度可猝灭高达 100%，具体取决于金属离子的存在，这与 2,2'-联吡啶基类似物 P1 非常相似。然而，聚合物 P2 对金属离子的敏感性比 P1 高得多。 2,2’-联吡啶基共轭聚合物由于金属离子螯合而产生的离子变色效应的根源在于引入带正电的金属离子引起的构象变化和聚合物链上的电子密度变化(Chen et al. J. Phys. Chem., B 2000, 104, 1950−1960)。在...
The effects of the rigidity of molecular recognition sites in fluorene-based conjugated polymers P1 and P2 on metal ion sensing have been investigated. The structures of polymers P1 and P2 have twisted 2,2‘-bipyridine and planar 1,10-phenanthroline units, respectively, which alternate with one fluorene monomer unit. It is found that the absorption and emission bands of 1,10-phenanthroline-based polymer P2 exposed to metal ions can be red-shifted up to 30 nm, and emission intensity can be quenched up to 100%, depending on metal ions present, which is very similar to that of the 2,2‘-bipyridine-based analogue P1. However, polymer P2 shows much higher sensitivity to metal ions than P1. The origins of ionochromic effects of the 2,2‘-bipyridine-based conjugated polymer due to the metal ion chelation have been attributed to both conformational changes and electron density variations on the polymer chains caused by introducing positively charged metal ions (Chen et al. J. Phys. Chem., B 2000, 104, 1950−1960). On...