A Ratiometric Fluorescent Sensor for Cd2+ Based on Internal Charge Transfer
1
Chemical Engineering College, Qinghai University, Xining 810016, China
2
Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84108, USA
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Sensors 2017, 17(11), 2517; https://doi.org/10.3390/s17112517
Received: 9 October 2017
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Revised: 26 October 2017
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Accepted: 31 October 2017
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Published: 2 November 2017
(This article belongs to the Special Issue Fluorescent Probes and Sensors)
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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Keywords:
ratiometric fluorescent sensor; Me4BOPHY; Cd2+ ion; ICT
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MDPI and ACS Style
Cheng, D.; Liu, X.; Xie, Y.; Lv, H.; Wang, Z.; Yang, H.; Han, A.; Yang, X.; Zang, L. A Ratiometric Fluorescent Sensor for Cd2+ Based on Internal Charge Transfer. Sensors 2017, 17, 2517. https://doi.org/10.3390/s17112517
AMA Style
Cheng D, Liu X, Xie Y, Lv H, Wang Z, Yang H, Han A, Yang X, Zang L. A Ratiometric Fluorescent Sensor for Cd2+ Based on Internal Charge Transfer. Sensors. 2017; 17(11):2517. https://doi.org/10.3390/s17112517
Chicago/Turabian StyleCheng, Dandan, Xingliang Liu, Yadian Xie, Haitang Lv, Zhaoqian Wang, Hongzhi Yang, Aixia Han, Xiaomei Yang, and Ling Zang. 2017. "A Ratiometric Fluorescent Sensor for Cd2+ Based on Internal Charge Transfer" Sensors 17, no. 11: 2517. https://doi.org/10.3390/s17112517
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