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A platinum(II) molecular hinge with motions visualized by phosphorescence changes

Significance With the current interest in the development of innovative artificial machineries and robotics at the molecular and nanoscale, there is an increasing demand for the strategic design of smart machineries that can have their motional states powered by subtle environmental changes and detectable by optical readout. Through an understanding of the relationship between the intriguing phosphorescence behaviors and molecular structures, an artificial platinum(II) molecular hinge with motions associated with visually appealing phosphorescence changes has been built, which can be opened or closed by rotary motion to give drastic phosphorescence color switching. Reversible motional switching has been demonstrated to be driven by solvent/temperature changes, paving the way to the development of a simple and efficient method for visualizing molecular motion. With the rapidly growing exploration of artificial molecular machines and their applications, there is a strong demand to develop molecular machines that can have their motional states and configuration/conformation changes detectable by more sensitive and innovative methods. A visual artificial molecular hinge with phosphorescence behavior changes is designed and synthesized using square-planar cyclometalated platinum(II) complex and rigid aromatic alkynyl groups as the building blocks to construct the wings/flaps and axis, respectively. The molecular motions of this single molecular hinge and its reversible processes can be powered by both solvent and temperature changes. The rotary motion can be conveniently observed by the visual phosphorescence changes from deep-red to green emission in real time.