Abstract
A new chromogenic and fluorescent ‘off-on’ chemosensor, RhDCP, based on rhodamine hydrazone was designed and synthesized. Its molecular structure was then confirmed by FTIR, 1H NMR, 13C NMR and Tandem mass spectrometry analysis. The spirocycle sensor RhDCP showed high selectivity for Hg2+ over other commonly coexistent metal ions in aqueous media. Upon addition of Hg2+ to RhDCP in solutions, a new absorption band centered at 559nm along with a change in color from colorless to purple, indicating that the corresponding spirolactam induced by Hg2+ to the ring-open form. Simultaneously, a strong emission band at 582nm was observed when excited by the wavelength of 530nm. The formation of a complex between RhDCP and Hg2+ was found to have a 1:1 host-guest stoichiometry using experimental data obtained from the Job’s plot and the mole ratio plot methods Thus, a selective fluorescent and colorimetric dual-response RhDCP establishes an important sensing platform for the real-time monitoring of Hg2+ ions in aqueous environment.
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
