Heat- and Strain-Induced Molecular Movement

  • ChemPubSoc Europe Logo
  • Author: Angewandte Chemie International Edition
  • Published Date: 18 August 2018
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Heat- and Strain-Induced Molecular Movement

Elastically flexible crystals can overcome many of the physical limitations traditionally associated with crystalline materials. They are stimuli-responsive materials and combine the molecular order of single crystals with the physical properties of soft matter. The fundamental mechanisms that lead to this behavior are not well understood yet.

Jack K. Clegg, University of Queensland, John C. McMurtrie, Queensland University of Technology, both Brisbane, Australia, and colleagues have used microfocus X-ray diffraction to map changes that [Cu(acac)2] crystals (acac = acetylacetonate) undergo upon bending. The team found that the molecules rotate to allow repeated reversible deformation (pictured right).

The researchers then used variable-temperature studies to determine the mechanism of thermal expansion. The molecular movement induced by changing the temperature is dominated by an increase in the distance between adjacent molecules (pictured left).

These results demonstrate that there are distinct differences in the mechanisms of bending and thermal expansion. This overturns the current understanding of movement in flexible crystals. However, further insights into the mechanisms of stimuli-responsive properties are required to enable the design of a range of hybrid materials.



Article Views: 1280

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter

A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH