Synthesis, Crystal Structures, and Luminescent Properties of Noninterpenetrating (6,3) Type Network Lanthanide Metal–Organic Frameworks Assembled by a New Semirigid Bridging Ligand

Abstract

AbstractA series of lanthanide metal–organic frameworks (MOFs) possessing 4f homometallic 2D noninterpenetrating (6,3) honeycomb topological network structures with lanthanide atoms acting as three‐connected centers have been assembled by using a semirigid bridging ligand with lanthanide nitrates, namely [{Ln2(NO3)6L3}·(H2O)2·(CHCl3)]n (Ln = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er; L = 2,5‐dimethyl‐1,4‐bis[{(2′‐benzylaminoformyl)phenoxy}methyl]benzene. The coordination layers are linked by intermolecular hydrogen bonds to form a 3D cage structure with 1D supramolecular channels along the c axis, in which chloroform and lattice water molecules are located to stabilize the structure. Under specific excitation, the SmIII, EuIII, TbIII, and DyIII MOFs exhibit characteristic emissions. The lowest triplet‐state energy level of the ligand indicates that the energy level of the ligand matches better to the resonance levels of TbIII and DyIII rather than SmIII and EuIII ions.