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Assembling Molecular Shuttles Powered by Reversibly Attached Kinesins
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Functionally rigid and degenerate molecular shuttles.

Il Yoon1, Diego Benítez, Yan-Li Zhao

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90095, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 24, 2008
PubMed
Summary
This summary is machine-generated.

This study details the synthesis and behavior of rigid [2]rotaxanes, where a cyclophane ring shuttles between naphthalene stations. The findings reveal faster shuttling rates due to reduced binding, offering insights into molecular machine dynamics.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Mechanically interlocked molecules (MIMs) are crucial for developing molecular machines.
  • Rotaxanes, a type of MIM, feature a ring threaded onto an axle.
  • Controlling the motion of the ring along the axle is key to their function.

Purpose of the Study:

  • To synthesize and characterize novel, functionally rigid [2]rotaxanes.
  • To investigate the dynamic shuttling behavior of a tetracationic cyclophane (CBPQT(4+)) ring between naphthalene stations.
  • To understand how linker rigidity and station binding affinity influence molecular shuttling dynamics.

Main Methods:

  • Clipping approach for template-directed synthesis of [2]rotaxanes.
  • NMR spectroscopy (1H NMR, variable-temperature NMR) for structural characterization and dynamic studies.
  • Mass spectrometry for structural confirmation.
  • Full-atomistic simulations using the DREIDING force field.

Main Results:

  • Successful synthesis and characterization of two rigid [2]rotaxanes (14 PF(6) and 24 PF(6)).
  • NMR data confirmed the formation of mechanically interlocked structures and revealed temperature-dependent shuttling behavior.
  • Reduced binding affinity of the ethynyl-naphthalene unit compared to 1,5-dioxy-naphthalene led to increased shuttling rates.
  • Experimental activation energies (ΔG‡) for shuttling were determined to be 9.6 and 10.3 kcal mol⁻¹.
  • Computational simulations closely matched experimental energy barriers.

Conclusions:

  • Functionally rigid [2]rotaxanes with controllable shuttling dynamics were successfully prepared.
  • The design of the linker and station significantly impacts the binding affinity and consequently the shuttling speed.
  • These findings contribute to the rational design of advanced molecular machines and materials.