A Shuttling Molecular Machine with Reversible Brake Function | Zendy

Hirose Keiji | Zendy; Shiba Yoshinobu | Zendy; Ishibashi Kazuaki | Zendy; Doi Yasuko | Zendy; Tobe Yoshito | Zendy

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A Shuttling Molecular Machine with Reversible Brake Function

Author(s) -

Hirose Keiji,

Shiba Yoshinobu,

Ishibashi Kazuaki,

Doi Yasuko,

Tobe Yoshito

Publication year - 2008

Publication title -

chemistry – a european journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.687

H-Index - 242

eISSN - 1521-3765

pISSN - 0947-6539

DOI - 10.1002/chem.200702001

Subject(s) - rotaxane , molecular machine , axle , ring (chemistry) , component (thermodynamics) , brake , dumbbell , ammonium , chemistry , catenane , materials science , molecule , nanotechnology , organic chemistry , physics , mechanical engineering , engineering , medicine , physical therapy , metallurgy , thermodynamics , supramolecular chemistry

Design, synthesis, and demonstration of a prototype of a shuttling molecular machine with a reversible brake function are reported. It is a photochemically and thermally reactive rotaxane composed of a dianthrylethane‐based macrocycle as the ring component and a dumbbell shaped molecular unit with two, secondary ammonium stations separated by a phenylene spacer as the axle component. The rate of shuttling motion was shown to be reduced to less than 1 % (from 340 to <2.5 s −1 ) by reducing the size of the ring component from 30‐crown‐8 to 24‐crown‐8 macrocycles upon photoirradiation. The ring component was turned back to 30‐crown‐8 by thermal ring opening, thus establishing a reversible brake function that works in response to photochemical and thermal stimuli.

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