A 'turn-on' fluorescent probe based on V-shaped bis-coumarin for detection of hydrazine

摘要

Hydrazine (N2H4) has been classified as an environmental contaminant arid human carcinogen owing to its high toxicity. Exposed to high concentration of hydrazine can cause irreversible damage to human bodies. Hence, it is significant to explore an effective analytical method to selectively recognize and detect it. In this work, an intramolecular charge transfer (ICT) based probe 1 was designed and synthesized by condensation of V-shaped bis-coumarin and 4-bromobutyric acid. The V-shaped bis-coumarin with pi-expanded system endowed the probe 1 larger stokes shift and superior tolerance to photobleaching. This "turn-on" probe exhibited a high selectivity towards hydrazine over other common ions and amine-containing species with a distinct fluorescent enhancement at 555 nm. It could rapidly detect hydrazine over a wide pH range and the detection limit was as low as 4.2 ppb. The large shift of absorption spectrum enabled it to detect hydrazine in real water samples and gas-state hydrazine by "naked-eyes". (C) 2020 Elsevier Ltd. All rights reserved.