A new highly selective colorimetric chemosensor 1 N'1,N'2-bis((1E,2E)-3-(4-(dimethylamino)phenyl)allylidene)oxalohydrazide was designed and synthesized as a colorimetric sensor for Hg2+. The sensor 1 showed high selectivity toward Hg2+ in a 1:1 stoichiometric system and fast color change from yellow to orange in the presence of Hg2+. The sensing mechanism was explained by theoretical calculations. Moreover, the resulting 1-Hg2+ complex acted as an efficient colorimetric sensor for I-, showing recovery of 1 from 1-Hg2+ complex. Furthermore, 1 and 1-Hg2+ complex could be used as practical, visible colorimetric test kits for Hg2+ and I-, respectively, in an aqueous environment. Therefore, probe 1 could be a good alternative method for onsite and real time screening of Hg2+ and I-.

Colorimetric chemosensor for the sequential recognition of mercury (II) and iodide in aqueous media

253rd National Meeting (2017)

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