As a hot-spot issue of global concern, antibiotics' overuse poses a significant threat to the eco-environment and human health. Here, three isostructural coordination polymers with the formula {[M(DCPP)(H2O)]∙(DMF)}n [M =...
Nanomaterials as carriers of small molecular drugs have been a focal point in recent years. In this work, a carbazolyl functionalized metal-organic framework UiO-67-CDC was successfully synthesized employing the ligand...
Sensory material which can recognize
preservatives and amino acids
through different fluorescence changes has significant application
value in many fields. Here, a pore-functionalized metal–organic
framework (MOF) becomes a versatile platform for fluoro-sensing various
preservatives and amino acids with higher emission and multicolorful
scaffolds and allows for visible detection. The carbazole groups in
a Zr-based MOF UiO-67-CDC (CDC = 9H-carbazole-2,7-dicarboxylic
acid) are partially substituted into dimethylation through postsynthetic N-methylation to form a positively charged framework UiO-67-CDC-(CH3)2. Because of electrostatic induction, the postmodification
skeleton can efficaciously encapsulate the anionic dye phloxine B
(PB) in the cavity of the electron-deficient MOF, and a newfangled
fluorescence “turn-on” behavior is ascribed due to the
inhibition of photoinduced electron transfer (PET) (from the benzene
rings to the quaternary ammonium group on the ligand) and the stunning
synergistic effect of the confinement-induced emission (CIE) enhancement.
PB@UiO-67-CDC-(CH3)2 shows a unique fluorescence
response for preservatives and amino acids with variable colors and
visual, quantitative discrimination effects, which could be applied
for sensing, switching, and anticounterfeiting identification. Notably,
the fluorescence emission peak of dye (PB) and MOF presents a ratiometric
change, further improving the detection’s resolution and veracity.
The sodium acetate and leucine detection limits are as low as 0.0157
μM and 0.1084 μM, respectively. In addition, a smartphone
was used to visualize sodium acetate by identifying the RGB value
of the fluorescent changes, and the LOD can be as low as 7.23 μM.
These features make the dye-embedded MOF composite a simple, efficient,
and instrument-free stratagem for the on-site and convenient detection
of preservatives in various samples.
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