Concave, umbrella-like metal complexes provide space to enable the largest molecular rotor operational in the solid-state.
Solid materials are generally known to be rigid and unmoving, but scientists are turning this idea on its head by exploring ways to incorporate moving parts into solids. This can enable the development of exotic new materials such as amphidynamic crystals -- crystals which contain both rigid and mobile components -- whose properties can be altered by controlling molecular rotation within the material.
To enable rotation of such a large molecule, it was necessary to create enough free space within the solid. The team synthesized concave, umbrella-like metal complexes that could shield the rotor molecule from unwanted interactions with other molecules in the crystal. They were able to create sufficient space to accommodate the giant rotor by attaching an especially large, bulky molecule to the metal atom of the stator.
This work expands what is possible for molecular motion in the solid-state. It provides a blueprint for exploring new avenues in the development of amphidynamic crystals, and could lead to the development of new functional materials with unique properties.
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