Quenching response fluorescence sensing

A competitive method for carbonate sensing is based on dicopper complex 17 and coumarin 343 as anion receptor and external fluorophore, respectively. The fluorophore 18 coordinates to the copper atoms through its carboxylic group, and energy transfer between coumarin ring and copper atoms quenches the fluorescence emission. Carbonate showed strong binding to the metal complex and coupled the displacement of the bound fluorophore with concomitant recovery of the coumarin emission. This ensemble showed selective response to carbonate over phosphate or carboxylate. 

Fig. 10 L Fluorescence microscopy images of MTP walls after incubation with selected ions (10 M, MeCN). Each square represents an individual signal of the whole response pattern arrays. Right. Plot of the normalised fluorescence emission intensity changes in each sensing system of the arrays upon metal ion complexation. Negative values indicate a quenching of fluorescence, while positive values indicate increase of fluorescence intensity. Reprinted with permission fiom [50]...

The SeaDog sensor utilized in this work is capable of near real-time detection of low concentrations of explosives in water. The sensor utilizes novel sensing materials originally developed by collaborators at MIT. These materials are fluorescent polymers that are highly emissive when deployed as solid-state thin films. When the polymers interact with nitroaromatic explosives such as TNT, the fluorescence is quenched [3-5], The response of these materials to target analytes... 

---