A novel selective fluorescent chemosensor for Cu(II)

All Organic Label-like Copper(II) Ions Fluorescent Film Sensors with High Sensitivity and Stretchability

“…Figure b shows the graph obtained with Cu (II) concentration vs fluorescence intensity, which shows a linear relationship in the Cu (II) concentration ranging from 1 × 10 –5 to 1 × 10 –10 M. Notably, the detection limit can reach as small as 1 × 10 –10 M. This highly sensitive characteristic can be well understood based on the fact that fiber wires provide a similar structure as optical cavity to trap emitted light and enhance the fluorescence intensity change due to the reaction of chlorophyll-a and copper ions. The comparison of detection limits with other reported copper ion sensors is given in Table . ,− Remarkably, our film sensor outperforms all published reports by more than 2 orders of magnitude in terms of the detection limit. We have analyzed the copper ions concentration from 1 to 10 μM, which is the copper pollution region associated with human life, such as raining water, running water, drinking water, and even our sweat as shown in the inset of Figure b.…”

Derivatization of Coumarins at the Benzenoid Ring in Aqueous Medium

“…Our goal was to functionalize coumarins at the benzenoid ring by using the activating effect of the oxide group. This is important because the coumarin ring is a fluorophore and many compounds have been derived from it for use as sensors , and some have been tested to possess medicinal properties . Accordingly, we proposed to carry out systematic studies on coumarins with reactions that could be carried out under alkaline condition.…”