Rhodamine B-based “turn-on” fluorescent and colorimetric chemosensors for highly sensitive and selective detection of mercury (II) ions

A rhodamine-phosphonate off–on fluorescent sensor for Hg2+ in natural water and its application in live cell imaging

“…To investigate the practical applicability of 3, the detection limit of this new chemodosimeter system was evaluated [14,18]. The fluorescence titration profile of 3 (10 M) with Hg 2+ was shown in Fig.…”

“…As is well known, rhodamine derivatives with spirolactam structure are nonfluorescent and colorless, whereas ring-opening of the spirolactam gives rise to a strong fluorescence emission and a pink color [7][8][9][10]. According to the strong thiophilic affinity of Hg 2+ , many chemodosimeters based on rhodamine contain an "S" group [11][12][13][14]. Thus, along with the leaving of HgS, the intramolecular nucleophilic reaction is accomplished, which triggered a domino reaction to bring about the opened-ring form of the rhodamine spirolactam.…”

Development of a novel fluorimetric bulk optode membrane based on meso-tetrakis(2-hydroxynaphthyl) porphyrin (MTHNP) for highly sensitive and selective monitoring of trace amounts of Hg2+ ions

“…Thus, the well known molecular systems that monitor Hg 2+ exploit the mechanism of complexation induced fluorescence quenching [6][7][8][9], and a few examples with fluorescence enhancement for Hg 2+ have been reported [10][11][12][13]. Considerable attention has been focused on the design of fluorescent chemosensors for Hg 2+ [14,15].…”

Synthesis of Fluorogenic Chemosensors for Hg2+Detection Using Naphthalimide Derivatives

“…Generally, design of the chemosensors are either based on the coordination of Hg 2+ to S atoms, or to multiple N atoms (10). In particular, naphthalimide and rhodamine derivatives, among other chemical probes in practice, are usually chosen as basic molecular probes for the synthesis of fluorescent chemosensors, as they are excellent fluorophores with high stability and quantum yield which contribute to unique photophysical properties (8,11). While earlier research studies of chemosensors focused on the proof of various synthesis principles, recent ones have become more focused on the investigation of specific sensors for the recognition of a particular ion (in this study, Hg 2+ ions).…”