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首页> 外文期刊>Chemistry: A European journal >Ratiometric Fluorescent Nanosensors for Copper(II) Based on Bis(rhodamine)-Derived PMOs with J-Type Aggregates
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Ratiometric Fluorescent Nanosensors for Copper(II) Based on Bis(rhodamine)-Derived PMOs with J-Type Aggregates

机译：基于双（若丹明）衍生的具有J型聚集体的PMO的铜（II）比例荧光纳米传感器

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摘要

By using pentyl-linked bis(rhodamine)-derived tetra-siloxane (PRh-Si-4) as the organosilica precursor, highly ordered PRh-bridged periodic mesoporous organosilicas (PRhPMOs) were prepared. When excited at lambda= 500 nm, the PRhPMO suspension that contained metal ions showed two separate emission peaks at lambda= 550 and 623 nm. The first peak, located at lambda= 550 nm, was due to ring-opening of the spiro structure in the rhodamine moiety and the second, located at lambda= 623 nm, originated from fluorescent aggregates of the PRh units embedded in the silica framework of the PRhPMO. By using the different intensity ratios of the two fluorescence signals (FI550/623), PRhPMOs could be used as turn-ON type fluorescent ratiometric chemosensors for Cu2+. Furthermore, based on the single-exciton theory, it was deduced that the fluorescent aggregates formed were of the J-type and had a coplanar configuration. Consequently, PRhPMOs display a longer fluorescence lifetime and greater fluorescent quantum yield than the respective monomers dissolved in solution, which is consistent with the experimental results.
机译：通过使用戊基连接的双（若丹明）衍生的四硅氧烷（PRh-Si-4）作为有机硅前体，制备了高度有序的PRh桥连的周期性介孔有机硅（PRhPMOs）。当在λ= 500 nm激发时，包含金属离子的PRhPMO悬浮液在λ= 550和623 nm处显示两个单独的发射峰。第一个峰位于lambda = 550 nm处，是由于若丹明部分螺结构的开环，第二个峰位于lambda = 623 nm处，是由嵌入二氧化硅骨架中PRh单元的荧光聚集体引起的PRhPMO。通过使用两个荧光信号的不同强度比（FI550 / 623），PRhPMO可以用作Cu2 +的开启型荧光比率化学传感器。此外，基于单激子理论，推断形成的荧光聚集体是J型并且具有共面构型。因此，与溶解在溶液中的各个单体相比，PRhPMOs具有更长的荧光寿命和更大的荧光量子产率，这与实验结果是一致的。

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