Synthesis of new phenolic-containing hydroxyacyl probe and its colorimetric fluorescence detection of S2-

The excessive S2- can lead to a variety of serious physiological diseases, so the quickly detection of S2- is of great significance for human. In this paper, a new simple and easily probe Y was designed and synthesized with hydrazine and substituted salicylaldehyde. It can detect S2- with good performance in a highly water contain solution (DMSO/H2O, v/v = 1/9), both colorimetric and fluorescence spectroscopy have obvious changes after adding 50-folds of S2-, and other common fifteen anions have almost no influence in the detection. The detection limit and complexation constant were calculated using fluorescence titration data to be 3.88 μmol/L and 3.68×106 L/mol, respectively. Job’s plot experiment showed that the binding ratio of the host with S2- is 1:1. The NMR titration was employed to verify the recognition mechanism, three protons in two hydroxyl groups (-OH) and one imine (-NH) are disappeared after adding excessive S2-, which shown that probe Y undergo a deprotonation process. Preliminary application experiments show that probe Y can detect S2- in water samples and soil.