A N2O2-tetradentate dioxime fluorescence probe for highly efficient sensing of S2– and solution discoloration detection of H2S gas.

A symmetrical N₂O₂-tetradentate dioxime chemical sensor H₂L was synthesized for the first time. The sensor H₂L can identify S^2– ion with dual channels of fluorescence–ultraviolet spectra, and through the calculation of binding constant and detection limit of L-S system, it was showed that H₂L can detect S^2– ion with high efficiency and specificity. pH response experiments were carried out on L-S system and H₂L to explore the pH range recognized by them. The recognition mechanism was determined by ¹H NMR titration experiment. At the same time, a new method of macro recognition by means of naked eye recognition (under natural light and ultraviolet light of 365 nm) and filter paper recognition was developed. The practical application of the sensor H₂L to detect H₂S was evaluated in actual water samples and identification experiment of H₂S. [ABSTRACT FROM AUTHOR]