A Ratiometric Fluorescent Sensor for Cd(2+) Based on Internal Charge Transfer.
A Ratiometric Fluorescent Sensor for Cd(2+) Based on Internal Charge Transfer.
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基于内部电荷转移的 Cd2 比率荧光传感器
DOI：
10.3390/s17112517
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发表时间：
2017-11-02
期刊：
影响因子：
--
通讯作者：
Zang L
中科院分区：
文献类型：
--
作者：
Cheng D;Liu X;Xie Y;Lv H;Wang Z;Yang H;Han A;Yang X;Zang L
This work reports on a novel fluorescent sensor 1 for Cd2+ ion based on the fluorophore of tetramethyl substituted bis(difluoroboron)-1,2-bis[(1H-pyrrol-2-yl)methylene]hydrazine (Me4BOPHY), which is modified with an electron donor moiety of N,N-bis(pyridin-2-ylmethyl)benzenamine. Sensor 1 has absorption and emission in visible region, at 550 nm and 675 nm, respectively. The long wavelength spectral response makes it easier to fabricate the fluorescence detector. The sensor mechanism is based on the tunable internal charge transfer (ICT) transition of molecule 1. Binding of Cd2+ ion quenches the ICT transition, but turns on the π − π transition of the fluorophore, thus enabling ratiometric fluorescence sensing. The limit of detection (LOD) was projected down to 0.77 ppb, which is far below the safety value (3 ppb) set for drinking water by World Health Organization. The sensor also demonstrates a high selectivity towards Cd2+ in comparison to other interferent metal ions.
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