Abstract
A novel chemosensor (RSNA) based on 1,8-naphthalimide fluorescent group and Rhodamine B was designed and synthesized for sensing Hg2+. As a ratiometric chemosensor, the probe system exhibits high affinity for Hg2+ based on fluorescence resonance energy transfer (FRET) mechanism. When RSNA interacts with Hg2+ in actual medium, accompanied by a significant color change from colorless to pink, and a light to orange fluorescence change. Meanwhile, RSNA shows a typical FRET signal from the 1,8-naphthalimide group to the Rhodamine group, a new emission peak appears at 585nm and the emission peak at 381nm decreases in the fluorescence spectrum. In addition, upon interaction with Hg2+, RSNA showed a 1:1 stoichiometry for the complex, the mechanism of interaction between RSNA and Hg2+ was also verified by ESI-MS, fluorescence and UV–vis spectra. Importantly, studies reveal that RSNA could be used for ratiometric detecting Hg2+, and a low detection limit of 0.059μM in actual medium. Futher, the probe was suitable for sensing Hg2+ in river water due to its real-time response, high recovery rate, and anti-interference property.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
