A dual-site fluorescent probe for separate detection of hydrogen sulfide and bisulfite

A new dual-site fluorescent probe (probe 1) was synthesized for the separate detection of hydrogen sulfide and bisulfite. Probe 1 exhibited a rapid response to H2S and HSO3− through two emission wavelengths and color changes, and displayed satisfactory sensitivity. Probe 1 changed color in response to various concentrations of H2S, while probe 1 test paper changed gradually from colorless to pink. With HSO3− addition, there was almost no color change. Furthermore, the presence of HSO3− does not affect the detection of H2S; however, the presence of H2S interferes with the detection of HSO3−. Hence, quantitative detection of HSO3− must occur in an H2S-free environment. The results indicate that probe 1 is suitable for use as a sensor for hydrogen sulfide detection.