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Achiral Polydialkylsilane Aggregates That Record Stirring Direction.

Xianhui Tang1, Xingxing Ji1, Yi Li1

  • 1Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P.R. China.

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Summary

Achiral polysilane aggregates can recognize and record chirality and stirring direction. Optically inactive polysilanes showed tunable optical activity linked to vortex flow dynamics.

Keywords:
aggregationchiralityoptical activitypolysilanesvortex flow

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Chiroptical Spectroscopy

Background:

  • Polysilanes are known for their unique optical and electronic properties.
  • Achiral molecules can exhibit chirality under specific conditions, a phenomenon known as 'induced chirality'.
  • Understanding how material properties are influenced by external stimuli is crucial for developing novel functional materials.

Purpose of the Study:

  • To investigate the ability of achiral polysilane aggregates to recognize and record chirality.
  • To explore the influence of mechanical forces, specifically vortex flow, on the optical properties of polysilane aggregates.
  • To determine if polysilane aggregates can serve as sensors for chiral compounds and mechanical stimuli.

Main Methods:

  • Synthesis of various polysilanes with different side chains, including chiral and achiral variants.
  • Preparation of polysilane aggregates in a tetrahydrofuran/isopropanol solvent mixture.
  • Characterization of aggregate properties using circular dichroism (CD) and linear dichroism (LD) spectroscopy.
  • Application of controlled vortex flow (varying direction, time, and rate) to the aggregate solutions.

Main Results:

  • Achiral polysilane aggregates demonstrated the ability to recognize the chirality of low-molecular-weight compounds.
  • The optical activity of achiral polysilane aggregates was significantly influenced by the direction, time, and rate of vortex flow.
  • Polysilanes with chiral side chains did not show tunable optical activity with changing vortex flow direction.
  • Distinct linear dichroism signals were observed in achiral aggregates under shear force, indicating induced optical activity.

Conclusions:

  • Achiral polysilane aggregates can act as recorders of mechanical stimuli, specifically stirring direction.
  • The observed optical activity in achiral polysilanes under shear suggests the formation of transient chiral structures on the aggregate surfaces.
  • These findings open possibilities for developing polysilane-based sensors for both chemical chirality and mechanical forces.