ZIFs feature topologies analogous to those of silica or zeolite networks (Fig. ), with tetrahedra consisting of a metal ion (e.g., Co 2+ , Zn 2+ ) and four imidazolate-based ligands . The first family of MOFs with demonstrated melting behavior was ZIFs and they have since then been the most studied MOF glass family. This includes the discovery of various meltable compositions (e.g., ZIF-4, ZIF-62, and ZIF-76) , simulation studies of the bond-breaking behavior leading to melting and glass-formation , as well as the effect of pressure on phase transitions . More recent studies have investigated the effect of changing the metal node and organic linker ratio , as well as the addition of water and an ionic liquid on various types of hybrid organic-inorganic glasses. In ZIF-62 (Zn(Im)1-x(bIm)x, where Im is imidazolate and bIm is benzimidazolate), changing the linker ratio results in only moderate changes of Tm and Tg (by about 70 and 30 °C, respectively, when x changes from 0.35 to 0.03). Hydrothermal treatment of ZIF-62 glass gives rise to OH -incorporation and results in larger changes of Tm (from 447 to <300 °C) and Tg (from 320 to ~200 °C) . Another study showed that ionic liquid (1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide) addition enables melting of the otherwise unmeltable ZIF-8 (Zn(mIm)2, where mIm is 2methylimidazole) crystal, yet with transitions temperatures comparable to those of other meltable ZIFs (Tm≈380 °C and Tg≈320 °C) . , where Tg is the glass transition of a modified glass and Tg,0 is the glass transition temperature of a pure glass former), shown for all modified ZIF-4 and ZIF-62 glasses of the current study (see Supplementary Table ) as well as literature data for silicates . The dashed lines represent guides for the eye based on exponential decay functions.