Comprehensive Summary

The development of host-guest MOF luminescent composites has attracted considerable attention. However, it is still a challenge to reasonably design large scale conjugated polycarboxylic acids metal-organic framework (MOF) and modulate donor-acceptor interaction. Herein, a series of isostructural 3D porous lanthanide MOF [Ln₂(BINDI)_0.5(NO₃)(DMA)(H₂O)]∙DMA∙2.5H₂O (Ln = La (1), Ce (2), Pr (3) and Nd (4); H₄BINDI (N, N’-bis(5-isophthalic acid)-1,4,5,8-naphthalenediimide) were synthesized. Considering the electron-deficient performances of Ln-BINDI MOFs, D-A type composites Ln-MOFs (1-4@H₄TBAPy) were prepared via the incorporation of electron-rich H₄TBAPy (1,3,6,8-Tetrakis(p-benzoic acid) pyrene), which more improved the luminescence performance of complexes 1-4 and can be used as fluorescence sensors for the detection of nitro compounds and aldehydes. High sensitivity of 1@H₄TBAPy towards pNBA, pNA PNP, DNP, and TNP could be achieved through hydrogen bond interactions between MOF and analytes, as well as the π-π interaction between H₄TBAPy and the naphthalene ring of BINDI, thus the fluorescence quenching efficiency of 1@H₄TBAPy better than that of the complex 1. In addition, it is found that 1@H₄TBAPy has high selectivity and sensitivity to aromatic aldehyde SA, 5-Mesal and HMBA. Such strategy to enhance the emission of NDI based Ln-BINDI MOFs, which will open up an avenue to obtain more fluorescent MOFs for sensing.

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