Metal-Organic Replica of Fluorite Built with an Eight-Connecting Tetranuclear Cadmium Cluster and a Tetrahedral Four-Connecting Ligand

A non‐interpenetrating 3D metal–organic framework, synthesized by a solvothermal reaction of cadmium nitrate and a tetracarboxylate ligand, is the first metal–organic analogue of fluorite (CaF2). In the structure of the title compound, depicted, an eight‐connecting tetranuclear cadmium cluster (green sphere) and a tetracarboxylate ligand (brown sphere) play the role of Ca2+ and F− ions, respectively, in fluorite.