Pr

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Stoddart et al. 1989
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molecular shuttles gliding of a ring along the
axle on which it is threaded
signal 1
signal 2
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(A) Molecular drawing of the bistable 2catenane
used in this work. The voltage-driven
circumrotation of co-conformer A0 to
co-conformer B is the basis of the device.
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(B) Proposed mechanism for the operation of the
device. Co-conformer A0 represents both the
ground-state structure of the 2catenane and the
switch open state of the device. When the
2catenane is oxidized, the TTF groups (green)
are ionized. The coconformer B is formed. When
the voltage is reduced to a near-zero bias, the
co-conformer B0 is formed, and this represents
the switch closed state of the device. Partial
reduction of the cyclophane (2 V) is necessary
to regenerate the A0 co-conformer. The reduced
co-conformer AB is indicated with an unknown
oxidation state.
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Science, Vol. 294, 21 December 2001, p.2442
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Controllable dethreadingrethreading processes,
based on a (E) (Z) photoisomerisation reaction,
of the pseudorotaxanes formed by selfassembly of
(E/Z)-1 with 24. The structures shown are
energy-minimised MM2 (CS Chem3D Pro) geometries
of pseudorotaxanes (E)-124 and (Z)-124
(hydrogen atoms have been omitted for clarity).
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Acid/base control of the wheel position on the
axle