Our systems throughout this study belong to multiple phases of ZIF-4: the crystal, liquids, and multiple melt-quenched glasses. The first amorphous MOF discovered and studied in detail, ZIF-4 has since been the subject of numerous works and can be seen as a prototypical amorphous ZIF system. It is built up from Zn 2+ metal nodes and imidazolate (Im) organic linkers, which are organized in the crystalline state as Zn(Im) 4 tetrahedra linked by Zn-N coordinative bonds as depicted in Figure . There are several amorphous phases of this system, which can be formed from the parent crystal by a variety of experimental methods, including ball milling, melt-quenching, or pressure-induced amorphization. A representative model of a melt-quenched glass of ZIF-4, gained from modelling synchrotron and neutron total scattering data, is presented in Figure .