Rotational motion of the caged supramolecular dynamer.

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Rotational motion of the caged supramolecular dynamer. Rotational motion of the caged supramolecular dynamer. (A and B) Sixty degree orientational switching between a stable δ1 and δ2 configuration with conservation of the chirality signature; images recorded with a time lap of 204 s (VB = 1.0 V, IT = 0.05 nA, TSample = 64.4 K). (C) Orientation switching event while recording the topography at the position indicated with an arrow; the molecular units are exclusively imaged with positions reflecting preferred configurations (VB = -1.0 V, IT = 0.05 nA, TSample = 64.8 K). (D and E) Rapid fluctuation of rotator states with event rates largely exceeding imaging frequency. The envelope of the intracavity molecular features with different chirality corresponds to a superposition of the two respective stable configurations (D, λ-rotator, VB = -1.0 V, IT = 0.1 nA, TSample = 78.3 K; E, δ-rotator, VB = 0.2 V, IT = 0.22 nA, TSample = 81 K). (F) Model for the collective rotation superimposed on the data in E. Dirk Kühne et al. PNAS 2010;107:50:21332-21336 ©2010 by National Academy of Sciences