Guest inducing fluorescence switching in lanthanide-tris((4-carboxyl)phenylduryl)amine frameworks integrating porosity and flexibility

By employing the nanosized tris((4-carboxyl)phenylduryl)amine ligand to assemble with Ln(3+) ions, a series of 2-fold interpenetrating lanthanide-organic frameworks (LnOFs; Ln = Y. Eu-Yb; FIR-16 to FIR-24) and heterometallic EuxTby-LnOFs (x + y = 2; FIR-25 to FIR-27) possessing the novel (3,6)-connected topology have been generated. FIR-17 with a high surface area of 941 m(2) g(-1) is an interesting flexible framework. Reversible fluorescence switching upon the presence or removal of guest molecules with different sizes is observed by using FIR-17 as a promising solvent sensor. This work presents an outstanding integration of phototuminescent properties and porosity for flexible lanthanide-organic frameworks.