School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
ACS Appl Mater Interfaces. 2013 Aug 28;5(16):8254-9. doi: 10.1021/am402438v. Epub 2013 Aug 6.
This work shows the sodium citrate induced efficient interpolymer π-stacking aggregation of the planar cationic conjugated polyelectrolyte poly[{9,9-bis[6'-(N,N-trimethylamino)hexyl]-2,7-fluorenyleneethynylene}-alt-co-(1,4-phenylene)] dibromide (PFE) in aqueous solution, which results in the self-quenching of fluorescence. Using the citrate-induced aggregation properties of PFE and the strong chelation ability of citrate with aluminum ions (Al(3+)), a sensitive and selective Al(3+)-ion detection assay in aqueous solution was developed through monitoring of the fluorescence recovery of PFE. The fluorescence intensity recovery of PFE depends on the concentration of Al(3+) ions, and linear fluorescence recovery was observed in the range of 0.5-9 μM. The limit of detection of this assay is 0.37 μM. Its simplicity and rapidity mean this assay shows promise for the real-time detection of Al(3+).
这项工作表明，柠檬酸钠能有效诱导平面阳离子共轭聚电解质聚[{9,9-双[6'-(N,N-三甲氨基)己基]-2,7-芴撑亚乙炔}-交替共-(1,4-亚苯基)]二溴化物(PFE)在水溶液中发生聚合物π-堆积聚集，导致荧光自猝灭。利用 PFE 的柠檬酸盐诱导聚集特性和柠檬酸盐与铝离子(Al(3+))的强螯合能力，通过监测 PFE 的荧光恢复，在水溶液中开发了一种灵敏和选择性的 Al(3+)离子检测方法。PFE 的荧光强度恢复取决于 Al(3+)离子的浓度，在 0.5-9 μM 范围内观察到线性荧光恢复。该测定的检测限为 0.37 μM。其简单快速的特点意味着该测定方法有望用于实时检测 Al(3+)。
