A highly selective and ratiometric fluorescent sensor for relay recognition of zinc(ii) and sulfide ions based on modulation of excited-state intramolecular proton transfer

Abstract

A highly selective and ratiometric fluorescent sensor for relay recognition of zinc(II) and sulfide ions based on modulation of excited-state intramolecular proton transfer3

A colorimetric chemosensor for the sequential recognition of Mercury (II) and iodide in aqueous media

“…Hence the iodide content of breast milk and urine is often required for nutritional, metabolic, and epidemiological studies of thyroid disorder [6]. Therefore, developing chemosensors that can detect iodide is strongly desired [7][8][9][10][11][12][13][14][15][16][17][18].…”

A New Thiosemicarbazone-Based Fluorescence “Turn-on” Sensor for Zn2+ Recognition with a Large Stokes Shift and its Application in Live Cell Imaging

“…of Zn 2+ to the metal ion containing solution, great increase in fluorescence intensity at 572 nm were observed except for Cu 2 + , Co 2 + , Hg 2 + , Ag + , and Ni 2+ . The observed interference from Cu 2 + , Co 2 + , Hg 2 + , Ag + , and Ni 2+ may attributed to their high binding affinity to the sensor, and the paramagnetic nature (Cu 2+ , Co 2+ and Ni 2+ ) [35] and ligand to metal charge transfer (Hg 2 + and Ag + ) [36] quenched the emission of the formed complex. These results imply that L has its limitation for Zn 2+ detection in the presence of any of those interfered metal ions.…”

A Simple Benzimidazole Based Fluorescent Sensor for Ratiometric Recognition of Zn2+in Water

“…The signal at 8.85 ppm in free L could be assigned to H d due to the possible hydrogen bonding between H d and amide O atom, Zn 2+ binding destroyed the hydrogen bonding and led to its up-field shift. 13 These results indicate that sensor L may bind Zn 2+ with an imidic acid form through tertiary N and imidic acid O atoms. This binding mode of sensor L with Zn 2+ suppressed the PET process from diethanolamine nitrogen to phenylbenzimidazole moiety, 14 which is responsible for the fluorescence enhancement.…”

“…Sensor L was facilely synthesized by the reaction of 1 with diethanolamine (Scheme 1) and was characterized by 1 H NMR, 13 C NMR and HRMS. The good water solubility of L makes it has a potential application for metal ion detection in water solution.…”