Series of Highly Stable Isoreticular Lanthanide Metal–Organic\nFrameworks with Expanding Pore Size and Tunable Luminescent Properties

Abstract

A series\nof highly porous isoreticular lanthanide-based metal–organic\nframeworks (LnMOFs) denoted as SUMOF-7I to SUMOF-7IV (SU = Stockholm\nUniversity; Ln = La, Ce, Pr, Nd, Sm, Eu, and Gd) have been synthesized\nusing tritopic carboxylates as the organic linkers. The SUMOF-7 materials\ndisplay one-dimensional pseudohexagonal channels with the pore diameter\ngradually enlarged from 8.4 to 23.9 Å, as a result of increasing\nsizes of the organic linkers. The structures have been solved by single\ncrystal X-ray diffraction or rotation electron diffraction (RED) combined\nwith powder X-ray diffraction (PXRD). The SUMOF-7 materials exhibit\nrobust architectures with permanent porosity. More importantly, they\nexhibit exceptionally high thermal and chemical stability. We show\nthat, by inclusion of organic dye molecules, the luminescence properties\nof the MOFs can be elaborated and modulated, leading to promising\napplications in sensing and optics.