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A Mechanistic Perspective on Plastically Flexible Coordination Polymers.

Biswajit Bhattacharya1, Adam A L Michalchuk1, Dorothee Silbernagl1

  • 1BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse, 12489, Berlin, Germany.

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|December 15, 2019
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Summary

This study introduces the first plastically flexible one-dimensional (1D) coordination polymer, [Zn(μ-Cl)2(3,5-dichloropyridine)2]n, which bends 180° intact. Flexibility arises from chain displacement, not polymer deformation, revealing a new mechanical model.

Keywords:
coordination polymerflexible crystalsmechanical propertiesplastic deformation

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Area of Science:

  • Materials Science
  • Crystallography
  • Polymer Chemistry

Background:

  • Mechanical flexibility in covalently bound single crystals is poorly understood.
  • One-dimensional (1D) coordination polymers offer potential for novel material properties.

Purpose of the Study:

  • To present the first example of a plastically flexible 1D coordination polymer.
  • To elucidate the mechanism behind the observed mechanical flexibility.
  • To propose a new model for mechanical flexibility in such materials.

Main Methods:

  • Synthesis and characterization of the coordination polymer [Zn(μ-Cl)2(3,5-dichloropyridine)2]n.
  • Mechanical testing involving bending of single crystals.
  • Microscopy, diffraction, and spectroscopic studies to analyze structural response.
  • Theoretical calculations to support experimental findings.

Main Results:

  • The compound [Zn(μ-Cl)2(3,5-dichloropyridine)2]n exhibits significant plastic flexibility over two crystallographic faces.
  • Single crystals remain intact when bent to 180°.
  • Macroscopic bending is attributed to the displacement of coordination polymer chains, not deformation of covalent polymer chains.
  • A new model for mechanical flexibility in 1D coordination polymers is proposed based on experimental and theoretical evidence.

Conclusions:

  • The study demonstrates a novel mechanism for mechanical flexibility in 1D coordination polymers.
  • The findings challenge existing understandings of mechanical behavior in crystalline materials.
  • Proposed model provides insights into the design of flexible materials.