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Crystal Melting and Vitrification Behaviors of the Three-Dimensional Nitrile-Based Metal–Organic Framework

Abstract

A three-dimensional (3D) metal–organic framework [Ag(pL2)(CF3SO3)]·2C6H6 (pL2 = 1,3,5-tris(4-ethynylbenzonitrile)benzene), composed of Ag+ and tripodal nitrile ligands, was prepared to enable the investigation of its crystal melting and vitrification behaviors. The guest-free state showed a crystal melting at 271 degC, and the liquid state transformed into a glassy state via cooling. The vitrification of the crystalline compound into an amorphous glassy state was also obtained by mechanical hand-grinding. The structure of the glassy state retained the 3D networked structure, confirmed by FT-IR, X-ray absorption, and scattering measurements. The mechanically induced glass showed a small uptake of CO2 and a strong affinity for benzene and H2O vapors, confirmed by gas sorption isotherms. Studies on powder X-ray diffraction have revealed that a vitrified structure returns to the original 3D crystalline structure by exposure to these vapors.

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Article information


Submitted
06 Jan 2020
Accepted
19 Feb 2020
First published
09 Apr 2020

Faraday Discuss., 2020, Accepted Manuscript
Article type
Paper

Crystal Melting and Vitrification Behaviors of the Three-Dimensional Nitrile-Based Metal–Organic Framework

C. Das and S. Horike, Faraday Discuss., 2020, Accepted Manuscript , DOI: 10.1039/D0FD00003E

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