Lanthanide-based gels, using citric acid as an assembler ligand, provide pure white light emission and monitor changes in pH as well as temperature over a wide range through a mixed ligand design strategy.
The development of fluorescent probes for selective
detection of cyanide has gained considerable attention over the past
two decades due to benefits like high selectivity as well as sensitivity,
fast response, visual output, accurate quantification, and a simplified
sample preparation procedure. However, the propensity of supramolecular
gels toward fluorescence sensing of cyanide in aqueous medium
is not well explored until now. Herein, we report the design and synthesis
of a novel copper based metallogel capable of sensing cyanide in water
by fluorescence “turn on”. Toward this, a terpyridine
attached poly(aryl ether) dendrone derivative (G1) is synthesized
which forms gel and exhibits Aggregation Induced Emission (AIE). The
addition and diffusion of copper ions to the gel resulted in the formation
of a nonluminescent copper metallogel (CuG). The copper metallogel
could selectively sense cyanide in water by a fluorescence “turn-on”
signal due to the regeneration of the AIE active gel. The mechanistic
pathways of the sensing have been studied, and the detection limit
for sensing was found to be as low as 1.09 μM. A thin film of
CuG was prepared by casting the gel and used as a test strip for the
visual detection of cyanide in water.
Luminescent polymer based metallogels have gained considerable interest due to their wide range of applications in the fields of tissue engineering, drug delivery, sensing, and optical systems. One of the...
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