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Mechanically induced polyamorphism in a one-dimensional coordination polymer.

Taichi Nishiguchi¹, Yuki Ohara¹, Kentaro Kadota²

¹Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku Kyoto 615-8510 Japan.

Chemical Science

|December 6, 2024

Summary

This summary is machine-generated.

Mechanical forces create distinct amorphous states in coordination polymers. These states exhibit different glass transition temperatures and structural orientations, with reversible transitions observed.

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Published on: September 26, 2016

Area of Science:

Materials Science
Polymer Chemistry
Solid-State Chemistry

Background:

Coordination polymers are versatile materials with tunable properties.
Amorphous materials lack long-range order, leading to unique physical characteristics.
Mechanical forces can influence the structural organization and properties of materials.

Purpose of the Study:

To investigate the formation of different amorphous structures in a coordination polymer under mechanical shear.
To characterize the distinct properties, including glass transition temperatures and structural orientations, of these amorphous states.
To explore the reversibility of transitions between these amorphous states.

Main Methods:

Synthesis and characterization of a one-dimensional coordination polymer, Cu(Tf2N)2(bip)2.
Application of static and oscillatory shear forces to induce different amorphous states.
Analysis of structural differences using X-ray absorption fine structure (XAFS) and small-angle X-ray scattering (SAXS).
Investigation of transitions using dynamic mechanical analysis (DMA).

Main Results:

Two distinct amorphous states of the coordination polymer were formed by static and oscillatory shear.
The static amorphous state exhibited a glass transition at -10 °C, while the dynamic amorphous state showed a transition at 70 °C.
XAFS and SAXS revealed differences in structural orientation between the two amorphous states.
Dynamic mechanical analysis confirmed the reversible transition between these two amorphous states.

Conclusions:

Mechanical shear forces are effective in creating distinct amorphous states in coordination polymers.
The amorphous states differ in their glass transition temperatures and structural characteristics.
Reversible transitions between these mechanically induced amorphous states are achievable, offering potential for responsive materials.