Abstract

The synthesis of N-cyclohexyl carbamate-attached fluorene-alt-phenylene copolymer (PFPNCC) and the use of PFPNCC as a “ligand-free” fluorescent chemosensor for Cu(II) are described. Addition of Cu(II) can efficiently quench the fluorescence of PFPNCC in nucleophilic solvents such as DMF and DMSO, but not in low nucleophilic solvents such as 1,4-dioxane and THF. Ultraviolet-visible spectra of the mixture of the conjugated polymer and Cu(II) indicate the presence of a reduced Cu (I) ion in the solution. Furthermore, fluorescence recovery of PFPNCC observed at low temperature suggests that the quenching and reducing mechanism is most probably due to a photo-induced electron transfer from excited PFPNCC to Cu(II). Our findings provide a novel strategy for highly selective conjugated polymer-based chemosensors for various target analytes, albeit “ligand-free”.

中文翻译：

---

亲核溶剂中“无配体”共轭共聚物对铜（II）的高度选择性检测

摘要

的合成ñ -环己基氨基甲酸芴附中高音描述了亚苯基共聚物（PFPNCC）以及PFPNCC作为Cu（II）的“无配体”荧光化学传感器的用途。Cu（II）的添加可以在亲核溶剂（例如DMF和DMSO）中有效地淬灭PFPNCC的荧光，但不能在低亲核溶剂（例如1,4-二恶烷和THF）中猝灭。共轭聚合物和Cu（II）混合物的紫外可见光谱表明溶液中存在还原的Cu（I）离子。此外，在低温下观察到的PFPNCC的荧光恢复表明，淬灭和还原机理最可能是由于光诱导的电子从激发的PFPNCC转移到Cu（II）。我们的发现为针对各种目标分析物的高选择性基于共轭聚合物的化学传感器提供了一种新颖的策略，尽管它是“无配体”的。