Journal
SENSORS
Volume 17, Issue 11, Pages -Publisher
MDPI AG
DOI: 10.3390/s17112517
Keywords
ratiometric fluorescent sensor; Me4BOPHY; Cd2+ ion; ICT
Funding
- Qinghai Science & Technology Department of China [2016-HZ-806]
- National Natural Science Foundation of China [21362027]
- China Scholarship Council (CSC)
- Qinghai University [2015-QGY-5]
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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 - 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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