Volume 225, 2021

Crystal melting and vitrification behaviors of a 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-cyanophenylethynyl)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 °C, 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. Powder X-ray diffraction studies have revealed that the vitrified structure returned to the original 3D crystalline structure by exposure to these vapors.

Graphical abstract: Crystal melting and vitrification behaviors of a three-dimensional nitrile-based metal–organic framework

Associated articles

Article information

Article type
Paper
Submitted
06 яну 2020
Accepted
19 фев 2020
First published
09 апр 2020

Faraday Discuss., 2021,225, 403-413

Author version available

Crystal melting and vitrification behaviors of a three-dimensional nitrile-based metal–organic framework

C. Das and S. Horike, Faraday Discuss., 2021, 225, 403 DOI: 10.1039/D0FD00003E

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