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Amorphous-amorphous transition in a porous coordination polymer.

Hiroyoshi Ohtsu1, Thomas D Bennett2, Tatsuhiro Kojima3

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Amorphous states are crucial in phase transitions of porous coordination polymers and metal-organic frameworks.
  • Understanding these transitions is key to controlling material properties and applications.

Purpose of the Study:

  • To investigate the crystalline-to-amorphous-to-amorphous-to-crystalline (CAAC) phase transition in a Zn-based coordination polymer.
  • To characterize the distinct amorphous phases formed during heating using advanced X-ray techniques.

Main Methods:

  • Utilized X-ray absorption fine structure (XAFS) spectroscopy.
  • Employed X-ray pair distribution function (PDF) analysis to probe local atomic structure.

Main Results:

  • Identified two distinct amorphous phases upon heating the coordination polymer.
  • Observed a reversible transition to a desolvated network.
  • Revealed an irreversible transition to an intermediate phase with elongated Zn-I bonds.

Conclusions:

  • The Zn-based coordination polymer exhibits complex phase behavior involving multiple amorphous states.
  • XAFS and PDF analyses provide detailed insights into structural changes during these transitions.
  • The findings contribute to understanding amorphous phase formation in framework materials.