Two novel europium coordination polymers based on fluorine substituted and similar carboxylate ligands: Syntheses, structures and luminescence

Two isostructural 3D europium metal-organic frameworks incorporating similar Eu-fluorine substituted carboxylate moieties have been synthesized under hydrothermal conditions. Each polymer possesses the open 3D non-interpenetrated frameworks featuring a (6, 4)-connected pseudo-primitive cubic (pcu) topology. It also demonstrates tunable or switchable fluorescence signals in response to the different solvates. The luminescent intensity of 1 is increased linear with the increasing concentration of Pb2 + cation in N,N-dimethyl formamide (DMF) suspension, and polymer 1 may be employed as a fluorescence ratiometric probe for pollutant cations.