An anthracene-based microporous metal–organic framework for adsorbing CO2 and detecting TNP sensitivity

Abstract

A new anthracene-based metal–organic framework (MOF, named as CUST-607), [Cd₃(H₂O)(H₃L)₂(dia)₂]·4DMA·10H₂O (dia = 9,10-bis(1H-imidazol-1-yl)anthracene, H₃L = 4,4′,4′′-[1,3,5-benzenetriyltris(carbonylimino)]tris(benzoate)), was synthesized by a solvothermal method. Through single X-ray diffraction analysis, CUST-607 displays a three-dimensional multihole network with the triclinic space group of P and (3,3,4,5)-connected nodes. Gas adsorption and desorption experiments show that CUST-607 has a microporous structure with a large surface area of 702.15 m² g⁻¹. CUST-607 also exhibits selective and strong adsorption of CO₂ with a 40 kJ mol⁻¹Q_st value. Luminescence sensing experiments show that CUST-607 has a high selectivity for detecting nitroaromatic explosives, particularly for 2,4,6-trinitrophenol. The quenching constant K_sv is 1.43 × 10⁵ M⁻¹, higher than that of most reported MOFs. In addition, the CUST-607 fluorescence sensor exhibits high recyclability in detecting nitrobenzene and 2,4,6-trinitrophenol and can be used as potential sensors in practical applications.