A Coumarin-Derived Fluorescence Chemosensors Selective for Copper(II)

A novel pyrazole biscoumarin based chemosensors for the selective detection of Cu2+ and Zn2+ ions

“…The absorption is plotted against the mole fraction of PBC (Fig. 8) resulting in a 1:1 and 2:1 ratio respectively for PBC-Cu 2+ and PBC-Zn 2+ [17,38] [39]. The data were linearly fitted and the K a value was determined from slope and the intercept of the line.…”

Synthesis of Fluorogenic Chemosensors for Hg2+Detection Using Naphthalimide Derivatives

“…This mechanism is relatively new and demonstrates a very significant fluorescence enhancement to metal cations in a simple and effective way. C=N isomerization sensing mechanism was applied to coumarin-based amine chemosensors in detecting Zn 2+ ions (6) and Cu 2+ ions (45), as well as to a fluorescein-based imines in detecting Cd 2+ ions (46). Following the same strategy, a chemosensor was developed using naphthalimide-appended crown ether derivative (dithiodioxomonoaza) for sensing of Hg 2+ through C=N isomerization with as fast as 18 seconds of response time (47).…”

Global and local interactions in the structure of crystalline 7-(diethylamino)-2-(2-oxo-2H-chromen-3-yl)chromenium perchlorate

“…Compounds containing chromenium or 2H-chromen-2-one fragments in their structure efficiently absorb radiation from the visible region and emit it in this region [2][3][4][5][6][7][8].…”

“…We synthesized this molecular ionic substance in view of the widespread occurrence of 2H-chromen-2-one (coumarin) derivatives in living matter [1] and their interesting spectral features [2,3], which can be put to use in analytics [4,5]. By combining coumarin and chromenium moieties of wellknown absorption and fluorescent abilities [3,[6][7][8] in one molecule and supplementing the latter moiety with a medium-sensitive amino group, we expected to obtain an efficient spectral probe of the acidic/basic or electrophilic/ nucleophilic properties of an environment.…”