Herein, two luminescent porous networks
(CMERI-1 & CMERI-2) have been reported
for the efficient detection of
formaldehyde (FA) from aqueous medium. Judicious solvent screening
using a high-throughput solvothermal procedure leads to two completely
different metal–organic framework (MOFs) with different architectures.
It is perceived that the framework CMERI-1 shows better
sensitivity with a very short response time (1 min) in the realm of
FA detection due to the facile imine (−NCH−)
formation, which is restricted in the case of CMERI-2. The fluorescence “turn-on” behavior is ascribed due
to the inhibition of photoinduced electron transfer (PET) (from amine
subunit to secondary building unit) process. The detection limits
of CMERI-1 & CMERI-2 toward FA in aqueous
medium were found to be 0.62 μM (0.019 ppm) and 1.39 μM
(0.041 ppm), respectively, that lie far below the intracellular concentration
of formaldehyde (100–400 μM). In addition, MOF-based
hydrogel membrane was fabricated, which shows vapor-phase detection
of FA, which is hitherto unexplored in this realm. Moreover, the response
mechanisms of MOFs are supported by density functional theory (DFT)
and Fukui indices analysis. The high stability of the porous frameworks
along with its interesting sensing features such as fast recognition
phenomenon, appreciable detection limit, etc. instigated us to explore
its real-world applicability in various food sample and water analyses.
In view of the modular design principle of our polymeric probe, the
proposed approach could open a new horizon to construct powerful sensing
materials for the ultrafast detection of other industrial pollutants
in the domain of supramolecular and analytical chemistry.
A state-of-the-art progression on inkjet-printed luminescent supramolecular conjugated architectures with phenomenal photophysical properties for anti-counterfeiting application and sensory platform formulation for recognition of perilous analytes.
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