Metal-centred azaphosphatriptycene gear with a photo- and thermally driven mechanical switching function based on coordination isomerism

Hitoshi Ube, Yoshihiro Yasuda, Hiroyasu Sato and Mitsuhiko Shionoya ()
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Hitoshi Ube: Graduate School of Science, The University of Tokyo
Yoshihiro Yasuda: Graduate School of Science, The University of Tokyo
Hiroyasu Sato: Rigaku Corporation
Mitsuhiko Shionoya: Graduate School of Science, The University of Tokyo

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Metal ions can serve as a centre of molecular motions due to their coordination geometry, reversible bonding nature and external stimuli responsiveness. Such essential features of metal ions have been utilized for metal-mediated molecular machines with the ability to motion switch via metallation/demetallation or coordination number variation at the metal centre; however, motion switching based on the change in coordination geometry remain largely unexplored. Herein, we report a PtII-centred molecular gear that demonstrates control of rotor engagement and disengagement based on photo- and thermally driven cis–trans isomerization at the PtII centre. This molecular rotary motion transmitter has been constructed from two coordinating azaphosphatriptycene rotators and one PtII ion as a stator. Isomerization between an engaged cis-form and a disengaged trans-form is reversibly driven by ultraviolet irradiation and heating. Such a photo- and thermally triggered motional interconversion between engaged/disengaged states on a metal ion would provide a selector switch for more complex interlocking systems.

Date: 2017
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DOI: 10.1038/ncomms14296

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