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The assembly of a fluorescent pentiptycene-based ligand with copper ion resulted in the formation of a 3D porous metal-organic framework ( UPC-21 ) based on well-known paddlewheel SBUs.  UPC-21  exhibits selective adsorption of CO 2  over CH 4  and N 2  at 273 K and 295 K, C 2 H 2  over CH 4  at 273 K. The most significant performance of  UPC-21  is its highly efficient detection of NACs such as 4-NP, 1,4-DNB, NB, and 1,3-DNB with the calculated quenching constants,  K  sv , being 3.097 × 10 6 , 1.406 × 10 6 , 4.420 × 10 5 , and 1.498 × 10 5  M −1  for 4-NP, 1,4-DNB, NB, 1,3-DNB, respectively, which keeps a record on the fluorescence detection of NACs. This is the first porous Cu(II) MOF that exhibits fluorescent detection of NACs with high sensitivities.

scientific reports

Pentiptycene-Based Luminescent Cu (II) MOF Exhibiting Selective Gas Adsorption and Unprecedentedly High-Sensitivity Detection of Nitroaromatic Compounds (NACs)