A co-ligand firstly introduced to 9-fluorenone-2,7-dicarboxylate-based MOF: synthesis, structure and photoluminescent property

Through hydrothermal reactions, 4,4′-bipyridine (bpy) co-ligands firstly was introduce to CdII–H2FDC system (H2FDC = 9-fluorenone-2,7-dicarboxylic acid), generating a new coordination polymer {[Cd2(FDC)2(bpy)]∙H2O}n (1). Compound 1 has a pillar-layer 2-fold interpenetrating pcu network, based on the square-grid tetranuclear [Cd4(COO)8] units. Interestingly, 1 shows a blue-shifted photoemission, as well as enhanced fluorescence lifetime compared with the pure H2FDC ligand.