Ratiometric fluorescent probe for the on-site monitoring of coexisted Hg2+ and F− in sequence

Recent advances in fluorescent materials for mercury(ii) ion detection

“…In contrast, the new reverse PET process in materials often causes “urn-off” fluorescence, which has also been shown to be useful in designing Hg 2+ ion sensors. 70–72 Hou et al 73 synthesized a novel zinc phosphonate with a one-dimensional chain structure based on (2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene)triphosphonic acid (H 4 L) and 2,2′-biimidazole (2,2′-biim). The as-synthesized [Zn(H 4 L)(2,2′-biim)] can act as a highly selective fluorescent probe for Hg 2+ ions.…”

Oxidized Bis(indolyl)methane Derivatives with Diverse Signaling Units: An Excitation-Dependent Fluorescence Response toward Heavy Metal Pollutants in an Aqueous Medium

“…Optical sensors are mostly considered superior sensory systems due to huge structural diversity, high sensitivity, tunable output response, etc. Based on their responses, the fluorescence-based optical probes can be categorized as turn-on, turn-off, or ratiometric sensors . Certain fluorophores have been reported to exhibit excitation-dependent emission, whereby the fluorescence emission maxima shift as the excitation wavelength is increased.…”