Highly selective detection of fluoride based on 2,2-diferrocenylpropane benzimidazolium borate-ester salt
作者:Zhi-Ming Su、Xi-Quan Yan、Chao-Li Liang、Cai-Xia Lin、Li-Li Xie、Yao-Feng Yuan
DOI:10.1016/j.tetlet.2016.02.019
日期:2016.3
A new anion receptor that utilized boron-fluoride interaction and (C-H)(+)...F--type ionic hydrogen bonding in the binding of F ions had been synthesized and characterized by IR, MS, HRMS, B-11, H-1, and C-13 NMR spectra. The signaling process was confirmed by UV-vis, electrochemistry measurements as well as H-1, F-19, and B-11 NMR spectroscopy. Among the tested anions: F-, Cl-, Br-, OAc-, H2PO4-, HSO4-, only F-induced a remarkable red-shift (29 nm) in the absorption spectrum which was concomitant with a color change from pink to faint yellow. This receptor provided a new approach for naked-eyed detection of F- and the detection limit was calculated to be 1.26 mu M. Besides, Cyclic Voltammetry (CV) showed that the receptor had unique selectivities for F- with a remarkable phenomenon in merging of the two reduction peaks in response to the increment addition of the anions. H-1, F-19, and (11B) NMR titration demonstrated that the receptor showed affinity and high selectivity for F- and provided the evidence of interaction between the receptor and F-. (C) 2016 Elsevier Ltd. All rights reserved.