A Record-Breaking Loading Capacity for Single-Molecule Magnet Mn12 Clusters Achieved in a Mesoporous Ln-MOF

A chiral mesoporous lanthanide-based metal–organic framework (Ln-MOF) was synthesized. More importantly, its loading capacity for Mn12Ac reached 40.15 mol %, which is not only larger than that reported for porous materials to date thus far but also significantly larger than that observed on the surface of LB film. Investigations on the crystal structures and the nitrogen adsorption isotherms reveal that the well-matched porous size with that of SMMs in MOFs, the flexible porosity of the MOFs, and the interactions between MOFs and SMMs are key for enhancing the loading capacity for SMMs in the MOFs.