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Updated: Mar 11, 2026

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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A photoswitchable rotaxane operating in monolayers on solid support.

Felix B Schwarz1, Thomas Heinrich2, Andreas Lippitz3

  • 1Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany. c.schalley@fu-berlin.de.

Chemical Communications (Cambridge, England)
|December 1, 2016
PubMed
Summary

A new photoswitchable rotaxane demonstrates reversible orientation changes on surfaces. This molecular switching behavior was confirmed using advanced spectroscopic techniques, paving the way for novel responsive materials.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Photoswitchable molecular machines offer dynamic control over material properties.
  • Rotaxanes are mechanically interlocked molecules with potential for nanoscale applications.

Purpose of the Study:

  • To synthesize and characterize a novel photoswitchable rotaxane.
  • To investigate its photo-induced switching behavior in solution and on surfaces.
  • To explore the surface orientation changes upon photo-switching.

Main Methods:

  • Synthesis of a novel photoswitchable rotaxane.
  • Solution-state analysis using Nuclear Magnetic Resonance (NMR) and Ultraviolet-Visible (UV-Vis) spectroscopy.
  • Surface deposition of rotaxane monolayers on glass.
  • On-surface photoswitching investigation using Angle-Resolved Near-Edge X-ray Absorption Fine Structure (AR-NEXAFS) spectroscopy.

Main Results:

  • Successful synthesis and characterization of the photoswitchable rotaxane.
  • Demonstrated reversible photo-switching behavior in solution.
  • Confirmed on-surface photoswitching of the rotaxane monolayer.
  • Angle-resolved NEXAFS spectra revealed a preferential orientation that reversibly changes upon switching.

Conclusions:

  • The novel photoswitchable rotaxane exhibits controllable on-surface orientation changes.
  • This molecular system demonstrates potential for applications in responsive surfaces and molecular devices.
  • The study highlights the utility of AR-NEXAFS for probing surface molecular dynamics.