Abstract

Abstract Molecular dynamics in the crystalline solid state, typically constrained by a densely packed crystal environment, may offer opportunities to control the physical properties of solid-state materials. In this work, a neutral crystalline molecular rotor featuring a para-phenylene rotator encapsulated by N-heterocyclic carbene ligands and connected via a C–Au–C rotational axis is presented. Single-crystal X-ray diffraction studies, along with variable temperature solid-state 2H NMR spin-echo measurements, confirm the presence of 180° 2-fold rotational dynamics of the para-phenylene moiety in the solid state.

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