The {CuI} cluster bearing metal organic frameworks: crystal structures and fluorescence detecting performances towards cysteine and explosive molecules.

Two {CuI} cluster-bearing metal organic frameworks (MOFs) of {[Eu(CuI)(INA)DMF]·0.95DMF} (Eu-CuI-INA) and {K[(CH)NH]Sr(INA)(DMF){(CuI)(INA)}·2HO} (Sr-K-CuI-INA, HINA = isonicotinic acid, DMF = ,-dimethyl formamide) were prepared and characterized in this work. Both materials feature a three-dimensional (3-D) structure, in which the {CuI} clusters and Eu (or Sr) metal ions are coordinated by INA ligands with pyridine and carboxylic groups, respectively. Impressively, Sr-K-CuI-INA exhibits sensitive fluorescence sensing behaviors towards cysteine and nitro-bearing molecules, demonstrating potential FL sensing applications for bio and explosive molecules. This work would provide a good reference for designing fluorescent MOF probes containing CuI molecules.