A molecular chameleon: Fluorometric to Pb2+, fluorescent ratiometric to Hg2+ and colorimetric to Ag+ ions

A cyanine‐based dual‐modal probe for fluorimetric detection of mercury ion and colorimetric sensing of pH

“…It has been reported that rhodanine-based fluorometric probes may be used for sensing Hg 2+ ions through two mechanisms: binding of Hg 2+ ions with the probes [21][22][23][24][25][26] or irreversible reaction between Hg 2+ ions and the probe. 27 Experiments were conducted to verify if the fluorescent response of probe CY to Hg 2+ ions arose from the binding mechanism.…”

“…19 A rhodanine moiety was incorporated into the new chemosensor because rhodaninederived fluorescent probes showed high selectivity for sensing of Hg 2+ ions. [20][21][22][23][24][25][26][27] In this article we report the synthesis, structural characterisation, and sensing performance of the cyanine-rhodanine dyad-based multifunctional chemosensor for Hg 2+ ions and pH.…”

“…To explore further in this respect we designed a cyanine‐rhodanine dyad for multifunctional detection of Hg 2+ ions and a broad range of pH changes, enlightened by the finding that a ratiometric probe and a fluorescence turn‐on Hg 2+ probe could be achieved via tuning the chemical structure of a cyanine‐based near‐infrared (NIR) fluorophore library 19 . A rhodanine moiety was incorporated into the new chemosensor because rhodanine‐derived fluorescent probes showed high selectivity for sensing of Hg 2+ ions 20–27 . In this article we report the synthesis, structural characterisation, and sensing performance of the cyanine‐rhodanine dyad‐based multifunctional chemosensor for Hg 2+ ions and pH.…”

“…measured at different times(1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43, 45, 47, 49 and 51 min) upon addition of Hg 2+ ion (20 μM) in DMSO/H 2 O (7:3, v/v) were measured and shown in Figure 5. Changes in the fluorescence intensity at 625 nm of CY (20 μM) with upon addition of 1 equivalent of Hg 2+ ion in DMSO/H 2 O (7:3, v/v) revealed that probe CY responded to Hg 2+ ion very rapidly and adding Hg 2+ ion to CY solution induced remarkable enhancement of the fluorescence intensity in 1 min.…”

A chromo-fluorogenic HMT sensor for Ag+ and the resultant HMT-Ag complex turn-off probe for F− in DMSO: experimental and theoretical studies

“…In most occurrences, secondary recognition of anions by secondary (tributary) complexes is normally encountered in reversible sensing systems, with a good record in literature so far, however with few to none for Ag + /F- modulated system. Thus, secondary recognition of anions through secondary complexes presents a new dimension towards molecular recognition mechanisms [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”