Dipolar molecular rotors in the metal–organic framework crystal IRMOF-2
Abstract
Rotating polar linker groups in the cubic metal–organic framework single crystal known as IRMOF-2 were investigated for freedom of motion, response to an external electric field, and effects of dipole–dipole interactions. The crystals consist of octahedrally coordinated zinc oxide clusters linked by the bromoterephthalate group, which contains a rotatable bromo-p-phenylene moiety. We confirmed the rotation by