A fluorescent probe for detection of Hg2+ions constructed by tetramethyl cucurbit[6]uril and 1,2-bis(4-pyridyl)ethene

In this paper, tetramethyl cucurbit[6]uril (TMeQ[6]) and 1,2-bis(4-pyridyl)ethene (G) were used to construct a supramolecular fluo-rescent probe G@TMeQ[6]. The host-guest interaction between TMeQ[6] and G was investigated using 1H NMR spectroscopy, single-crystal X-ray diffraction and various experimental techniques. The results show that TMeQ[6] and G form an inclusion com-plex with a host-guest ratio of 1:1 and the equilibrium association constant (Ka) was 2.494 x 104 M-1. The G@TMeQ[6] fluores-cent probe can sensitively recognize Hg2+ ions by fluorescence enhancement. The linear range is 0.33 x 10-5-1.65 x 10-5 mol & BULL;L-1, R2 = 0.9926, and the limit of detection is 4.12 x 10-8 mol & BULL;L-1. The fluorescent probe can be used to detect the concentration of Hg2+ ions in aqueous solution, and provides a theoretical basis for the development of new fluorescent probes for detecting heavy metal ions.