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Reversible Pressure-Controlled Depolymerization of a Copper(II)-Containing Coordination Polymer.

Jack K Clegg1,2, Aidan J Brock2, Katrina A Jolliffe1

  • 1School of Chemistry, The University of Sydney, NSW, 2006, Australia.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 22, 2017
PubMed
Summary
This summary is machine-generated.

Pressure triggers a reversible structural change in a copper coordination polymer. This unique reaction involves Cu-N bond dynamics, transforming the material from a 1D polymer to discrete dinuclear complexes.

Keywords:
X-ray structurecoordination polymercopperhigh-pressure chemistrystimuli responsive

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Coordination polymers exhibit diverse structures and properties.
  • Investigating the impact of external stimuli like pressure on materials is crucial for understanding their behavior.
  • Copper-based coordination polymers are of interest due to their potential applications.

Purpose of the Study:

  • To investigate the effect of pressure on a one-dimensional copper(II)-containing coordination polymer.
  • To characterize the structural transformations induced by pressure.
  • To elucidate the mechanism of pressure-induced bond breaking and formation.

Main Methods:

  • Single crystal X-ray diffraction was employed to monitor structural changes.
  • A diamond anvil cell was used to apply controlled pressure to the crystal.
  • The pressure-induced phase transition was studied at the molecular level.

Main Results:

  • A reversible phase change was observed at a low elevated pressure (≈0.05 GPa).
  • The material depolymerized, involving cleavage and formation of axial copper-nitrogen (Cu-N) bonds.
  • Axially coordinated 1-methylpiperazine ligands underwent "ring flips" during the transition.
  • The structure shifted from a 1D coordination polymer to discrete dinuclear complexes.

Conclusions:

  • Pressure can induce significant and reversible structural rearrangements in coordination polymers.
  • The observed Cu-N bond dynamics and ligand reorientation are key to the phase transition.
  • This study reveals a non-intuitive structural transformation driven by external pressure.