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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Dynamic Pseudorotaxane Crystals Containing Metallocene Complexes.

Kai-Jen Chen1, Pei-Lin Chen2, Masaki Horie3

  • 1Department of Chemical Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan.

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|October 29, 2017
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Summary
This summary is machine-generated.

Dynamic pseudorotaxane crystals exhibit temperature- and light-responsive mechanical motion. Ruthenocene-based crystals undergo a lower thermal phase transition, enabling significant photomechanical force generation.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Molecular machines and switches utilize pseudorotaxanes to convert external stimuli into mechanical work.
  • Dynamic pseudorotaxane crystals offer tunable responses to environmental changes.

Purpose of the Study:

  • To synthesize and characterize thermo- and photoresponsive pseudorotaxane crystals.
  • To investigate the structural basis for mechanical motion in these systems.
  • To explore their potential for photomechanical energy conversion.

Main Methods:

  • Synthesis of pseudorotaxane crystals incorporating ferrocene and ruthenocene axles with dibenzo[24]crown-8 ether rings.
  • Variable-temperature single-crystal X-ray crystallography.
  • Photomechanical testing using 405 nm laser irradiation.

Main Results:

  • Ruthenocene-containing pseudorotaxanes showed a lower thermal phase transition (86°C) compared to ferrocene analogues (128°C).
  • Structural analysis revealed ruthenocene's role in distorting the pseudorotaxane and facilitating axle twisting.
  • A mixed crystal demonstrated a lifting force 6,400 times its weight under laser irradiation at 85°C.

Conclusions:

  • Pseudorotaxane crystal structure dictates thermal and photomechanical response.
  • Ruthenocene incorporation lowers transition temperatures and enhances mechanical output.
  • These materials show promise for light-driven molecular actuation.