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A Ratiometric Fluorescent Sensor for Cd2+ Based on Internal Charge Transfer. 2017

Dandan Cheng, and Xingliang Liu, and Yadian Xie, and Haitang Lv, and Zhaoqian Wang, and Hongzhi Yang, and Aixia Han, and Xiaomei Yang, and Ling Zang
Chemical Engineering College, Qinghai University, Xining 810016, China. 1994990022@qhu.edu.cn.

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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