A N₂O₂-tetradentate dioxime fluorescence probe for highly efficient sensing of S^2– and solution discoloration detection of H₂S gas

Abstract

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.

GRAPHICAL ABSTRACT

Keywords:

• Fluorescent UV dual-channel sensor
• H₂S gas identification
• naked-eye detection
• filter paper recognition
• actual water sample test

Disclosure statement

The authors declare no conflict of interest.

Additional information

Funding

This work was supported by Gansu Science and Technology Planning Program (No. 20JR2RA002) and the Open Foundation of Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University (No. 21YRWEK004), two of which are gratefully acknowledged.