Two photoluminescent metal–organic frameworks based on a BODIPY-derived bipyridine ligand

Abstract

Two new metal–organic open frameworks (MOFs) [Zn3L2(btc)2(H2O)]·(guests) (1), [CdL(bdc)]·(guests) (2), were successfully prepared by using a photoluminescent BODIPY-based bipyridine linker, L, and auxiliary ligands 1,4-benzenedicarboxylate (H2bdc) and 1,3,5-benzenetricarboxylate (H3btc), respectively. MOF 1 has a 2-fold interpenetrating three-dimensional (3D) framework with an 8-connecting body centered cubic (bcu) net, built upon a paddlewheel cluster [Zn2(O2CR)4], a tetrahedrally connecting Zn and a 3-connected btc3− ligand. MOF 2 has a highly open framework with a kagome-type net. It is a pillared layered structure made of 2D [Cd(bdc)] kagome sheets and L as pillars. MOF 1 was shown to exhibit permanent porosity and adsorption of N2, H2, CO2 and CH4. Both MOFs exhibited strong photoluminescent emissions at room temperature with peaks at 540 nm upon excitation, owing to a ligand L-based excited state.