A novel ratiometric fluorescence and colorimetric probe with a large stokes shift for Hg2+ sensing

作者：Leng, Taohua^*; Ma, Yuwen; Chen, Guiyu

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2018, 353: 143-149.

DOI：10.1016/j.jphotochem.2017.11.023

• Ratiometric
• Colorimetric probe
• Fluorescence probe
• Mercury ion
• Large stokes shift
• Naked-eye

A novel ratiometric fluorescence and colorimetric probe (BDT-PBES) based on benzo[1,2-b:4,5-b'] dithiophene (BDT) unit, for the detection of Hg2+, was developed with dithioacetal group as the response unit. Based on the Hg2+-promoted dithioacetal deprotection reaction mechanism, the probe displayed high selectivity for He2+ over other ions including Co2+, Mn2+, Ag+, Cd2+, Pb2+, Ca2+, Al3+, Cr3+, Na+, Cu2+, Mg2+, Ni2+, K+, Pd2+ and Fe2+. The detection limit reached as low as 3.1 x 10(-7) M. When Hg2+ existed, the maximum absorption peaks were obviously red-shifted with a solution color change from clarifying to light yellow, and the fluorescence changed with a large Stokes shift (179nm) from blue-green to yellow.

• 出版日期2018-2-15
• 单位上海市质量监督检验技术研究院; 华东理工大学