An inorganic–organic hybrid Eu–W-implanted tartrate-connected selenotungstate tetramer {[Eu₄(H₂O)₁₂W₆O₁₂(tar)₂][B-α-SeW₉O₃₃]₄}¹⁶– (1a, H₄tar = tartaric acid) was successfully obtained by introducing the flexible multidentate tartrate ligand into the Se-templated lacunary polyoxometalate (POM) and lanthanide (Ln) system. 1a comprises two equivalent penta-nuclear Eu₂W₃-cluster-encapsulated {[Eu₂(H₂O)₆W₃O₆][B-α-SeW₉O₃₃]₂}⁴– dimeric units in an ''open C-shaped'' arrangement that are gathered together by double tetra-dentate tar⁴– linkers. Besides, 1a exhibits remarkable stability and strong photoluminescence (PL) emission in aqueous medium, which is able to distinguish toxic chemical pollutants, o-nitrophenol (o-NP) from its two isomers m-nitrophenol (m-NP) and p-nitrophenol (p-NP), especially achieving highly selective and sensitive discrimination of o-NP with a low detection limit of 0.73 μM. The practical application of probe 1a is realized in lake water with good recoveries. The PL sensing mechanism involving static quenching and competitive absorption was elucidated finally. This work paves the way for the designed synthesis of novel organic ligand and Ln-functionalized POM hybrids and the further exploration of POM materials in recognizing environmental pollutants.
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Dai et al. (2023) studied this question.
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