Sensing and adsorption of hazardous and explosive nitroaromatic compounds using metal–organic frameworks (MOFs) have been a promising research field in the current scenario due to environmental concerns and homeland security. Here, we report two mixed ligand MOFs {[Co₂(SDB)₂(TIB)(H₂O)](H₂O)(1,4-dioxane)₂}_n (CP1) and {[Cd₃(SDB)₃(TIB)](H₂O)₂(1,4-dioxane)(G)_x}_n (CP2) (where SDB = 4,4′-sulfonyldibenzoate, TIB = 1,3,5-tris(imidazol-1-ylmethyl) benzene, and G = guest solvent molecules) synthesized by a hydrothermal method and the application of CP2 as an adsorbent and sensing material for 2,4,6-trinitrophenol (TNP). Both MOFs are characterized by various physicochemical techniques including single crystal X-ray analysis, and the crystal structures of CP1 and CP2 revealed that both MOFs are 3D frameworks composed of trimeric metal clusters linked by SDB ligand further coordinated through the imidazole nitrogen of the TIB moiety. Taking advantage of d¹⁰ transition metal present in the case of CP2, the recognition of nitroaromatics has been investigated engaging this fluorescent material. The photoluminescence property of CP2 revealed that significant and sensitive fluorescence quenching was observed toward TNP in the aqueous phase from different pools of NACs with a detection limit up to 35 ppb. Plausible accounts for the fluorescence quenching and CP2 as a column chromatographic filler for the adsorption of TNP from water have also been demonstrated.

中文翻译：

---

三维Co（II）/ Cd（II）金属-有机框架：发光Cd-MOF用于检测和吸附水相中的2,4,6-三硝基苯酚

由于对环境的关注和对国土安全的考虑，在目前的情况下，使用金属有机框架（MOF）感测和吸附危险性和爆炸性硝基芳族化合物一直是一个有前途的研究领域。在这里，我们报告两个混合的配体MOF {[Co ₂（SDB）₂（TIB）（H ₂ O）]（H ₂ O）（1,4-二恶烷）₂ } _n（CP1）和{[Cd ₃（SDB ）₃（TIB）]（H ₂ O）₂（1,4-二恶烷）（G）_x } _n（CP2）（其中SDB = 4,4'-磺酰基二苯甲酸酯，TIB = 1,3,5-三（咪唑-1-基甲基）苯，G =客体溶剂分子），并使用CP2作为吸附剂2,4,6-三硝基苯酚（TNP）的传感材料。两个MOF均通过包括单晶X射线分析在内的各种物理化学技术进行表征，CP1和CP2的晶体结构表明这两个MOF都是由SDB配体连接的三聚金属簇组成的3D骨架，并通过TIB部分的咪唑氮进一步配位。在CP2的情况下利用存在的d ¹⁰过渡金属，已经研究了硝基芳香族化合物对这种荧光材料的识别作用。CP2的光致发光特性表明，从不同的NAC池向水相中的TNP观察到了显着且灵敏的荧光猝灭，检测限高达35 ppb。荧光猝灭的合理解释和作为柱色谱填料的CP2也已被证明可用于从水中吸附TNP。