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that 1c represented a robust sensor for high-throughput measure-
ments against F−.
In summary, we report a new fluorescence sensor (1c) based
on N-imidazolyl-1,8-naphthalimide for the detection of fluoride
with high sensitivity and selectivity. 1c displays strong fluor-
escence due to coplanar geometry formed by the intramolecular
H-bond between naphthalimide and imidazole moieties. The
addition of F− disrupts the H-bond and consequently causes sig-
nificant fluorescence quenching. This sensing strategy provides a
new “on–off” signal transition mechanism for fluorescence
sensing on the basis of 1,8-naphthalimide.
This research is supported by Nebraska EPSCoR, URCA and
URF in University of Nebraska at Kearney. Authors thank
Professor Gene Wubbles in University of Nebraska at Kearney
for many useful discussions and suggestions.
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