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A new fluorescent ‘‘on–off’’ chemosensor for Hg2+initiated by a derivative of rhodamine B was designed and synthesized. Compound 1 exhibited high sensitivity and selectivity for Hg2+over other commonly coexistent metal ions in aqueous media. Upon the addition of Hg2+, the spirocyclic ring of probe is opened and a significant enhancement of visible color and fluorescence in the range of 500–600 nm is observed. The colorimetric and fluorescent response to Hg2+can be conveniently detected by the naked eye, which provides a facile method for visual detection of Hg2+. From the molecular structure and spectral results of 1, an irreversible, hydrolysis, desulfurization reaction mechanism is proposed.
A new fluorescent "on-off ’’ chemosensor for Hg2 + initiated by a derivative of rhodamine B was designed and synthesized. Compound 1 exhibits high sensitivity and selectivity for Hg2 + over other commonly coexistent metal ions in aqueous media. Upon the addition of Hg2 +, the spirocyclic ring of probe is opened and a significant enhancement of visible color and fluorescence in the range of 500-600 nm is observed. The colorimetric and fluorescent response to Hg2 + can be conveniently detected by the naked eye, which provides a facile method for visual detection of Hg2 +. From the molecular structure and spectral results of 1, an irreversible, hydrolysis, desulfurization reaction mechanism is proposed.