By combining rotaxanes and metal-organic frameworks, a group of material scientists and chemists at the University of Tokyo has created a new class of interlocking supramolecular systems. The group combined the two structures and discovered potential applications for the results in their study, which was published in the journal Nature Communications. Compounds called metal-organic frameworks (MOFs) are made by combining metal ions in a way that creates structures in one, two, or three dimensions. In the field of chemistry, the resulting ligands are referred to as linkers or struts. They are usually used to make things like sensors, energy-storing machines,