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

Two {Cu 2 I 2 } cluster-bearing metal organic frameworks (MOFs) of {[Eu(CuI) 2 (INA) 3 DMF]·0.95DMF} n (Eu-CuI-INA) and {K[(CH 3 ) 2 NH 2 ]Sr 4 (INA) 2 (DMF) 2 {(Cu 2 I 2 ) 2 (INA) 8 }·2H 2 O} n (Sr-K-CuI-INA, HINA = isonicotinic acid, DMF = N , N -dimethyl formamide) were prepared and characterized in this work. Both materials feature a three-dimensional (3-D) structure, in which the {Cu 2 I 2 } clusters and Eu 3+ (or Sr 2+ ) 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. Two metal organic frameworks bearing {Cu 2 I 2 } cluster modules are presented, in which Sr-K-CuI-INA emits red luminescence and exhibits fluorescence sensing towards cysteine (Cys) and explosive molecules.