In this paper, a salamo-based copper(II) complex probe L-Cu2+ was synthesized, which combined with copper(II) ions to form L-Cu2+ for the detection of S2− and had a good fluorescence chemical response. Through spectral analysis, we found that S2− could be identified with high sensitivity and selectivity in the presence of various anions and could be used for the detection of S2− by the naked eye. With the addition of S2−, the solution color changed from colorless to bright yellow. UV absorption, fluorescence and other characterization methods were carried out, and the mechanism of action was determined. In addition, we performed a visual inspection of H2S gas, and the probe L-Cu2+ could detect S2− in the gas molecules, revealing its potential application value in biology and medicine.
