Mechanically interlocked molecular architectures (MIMAs) are molecules that are connected as a consequence of their
topology. This connection of molecules is analogous to keys on a
key chain loop. The keys are not directly connected to the key chain loop but they cannot be separated without breaking the loop. On the molecular level the interlocked molecules cannot be separated without significant distortion of the
covalent bonds that make up the conjoined molecules. Examples of mechanically interlocked molecular architectures include
catenanes,
rotaxanes,
molecular knots, and
molecular Borromean rings.