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

摘要

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 Eu_xTb_y-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 photoluminescent properties and porosity for flexible lanthanide-organic frameworks.