University of Science and Technology), MIL-1 (Materials Institute Lavoisier), and UiO-1 (Universitetet I Oslo) . Fe, Cu, Zn, Co, and other metal ions are encircled by nitrogen-based tetrahedra and connected to imidazole rings, that can serve several purposes. The ZIF (zeolite imidazolate framework) is a number and acronym that can be used to create these MOFs .