Guiyuan Wu, Bingbing Shi, Bing Hu, Youming Zhang, Qi Lin, Hong Yao and Taibao Wei
In this paper, we developed a bilateral Schiff base for the colorimetric and fluorometric dual-channel sensing of Hg2+ ions by the hydrolysis of carbon-nitrogen double bond, altering an ICT state mechanism and then Hg2+ ions coordinating with amino moieties of 1,5-DAN and leading to the aggregation of 1,5-DAN. Meanwhile, it formed a stable neutral complex of amino-Hg-amino. In addition, test strips based on L were fabricated, which also exhibit a good selectivity to Hg2+ as in solution. This work provides a novel approach for the selective recognition of mercury ions. Notably, the color changes are very significant and all the recognition processes can be observed by the naked eyes. We believe the test strips can act as a convenient and efficient Hg2+ test kit.