Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 45, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104572
Keywords
cyclodextrin; discriminative response; fluorescence; phosphate; organophosphate; polyoxometalate cluster
Categories
Funding
- National Natural Science Foundation of China [21906119]
- China Postdoctoral Science Foundation [2019M661623]
- Australian Research Council
- QUT Centre for Materials Science
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A novel cross-linked cyclodextrin and lanthanide ion polyoxometalate composite is developed and applied for discriminative detection of inorganic and organic phosphate phases, showing excellent selectivity and anti-interference ability. The distinct interactions between lanthanide ions and the phosphate analogs contribute to the outstanding performance.
Polyoxometalate (POM) clusters containing lanthanide ion (LnPOM) possess excellent luminescence features, but the envisaged applications are hindered by the challenges in integration into functional architectures. Herein, a novel cross-linked cyclodextrin (CL-CD) and LnPOM composite is developed and applied for discriminative detection of inorganic and organic phosphate phases. For inorganic phosphates, a ratiometric fluorescence response is demonstrated with excellent selectivity, and anti-interference ability in complex analyte mixtures. The outstanding performance is attributed to the high affinity of POM and distinct interactions between La3+ and Eu3+ with the phosphate. For organophosphates, a signal-off fluorescence response for p-nitrophenyl-substituted organophosphates is discovered due to the encapsulation of nitrophenyl group into the hydrophobic cavity of CD that enhances the interactions between POM and p-nitrophenyl phosphate. The discriminative responses of CL-CD-LnPOM to inorganic phosphates and organophosphates bring new insights into POM-based fluorescence probes for the detection of inorganic and organic phases based on the intrinsic structural difference between the phosphate analogs.
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