A cationic organic dye based on coumarin fluorophore for the detection of N2H4 in water and gas

Hydrazine is an important chemical reagent, which has been widely used in chemical industry. However, the extensive usage of N2H4 poses a potential threat to water and air safety due to its good water solubility, strong volatility and high toxicity. Therefore, the rapid and reliable detection of hydrazine is of great significance. In this work, a cationic organic dye (probe) based on coumarin fluorophore with double emission wavelength (lambda ex =390 nm, lambda em = 650/450 nm) was developed successfully. In aqueous solution, this probe can reliably detect hydrazine in a broad concentration range (2.05-996 mu M) and a wide acidity range (pH 5-11) by the ratio-type fluorescence signal (F450/F650), and the detection time is about 20 min. Besides, it is worth pointing out that the test papers prepared by impregnating the organic dye on ordinary filter paper can realize the visual detection of hydrazine in water, beverages and gas within 2 min, showing excellent specificity and wide practicability.

Automated summary

The cationic organic dye based on coumarin fluorophore with double emission wavelength was successfully developed for the reliable detection of hydrazine in a broad concentration and acidity range, with a detection time of about 20 minutes. Moreover, the test papers prepared with the organic dye on ordinary filter paper can visually detect hydrazine in water, beverages, and gas within 2 minutes, demonstrating excellent specificity and wide applicability.