We have also probed the structure of the modified Br -and I -analogous glasses (Fig. ). We find strong peaks corresponding to the expected bond lengths of Zn-Br (~2.4 Å) and Zn-I bonds (~2.6 Å), supporting the partial (benz)imidazolate for halide exchange . The in situ PDF data for these systems show that the Zn-Br and Zn-I bonds are formed upon heating. This is more evident in the Br -and I -glasses compared to the Cl -glass due to the longer bond lengths of Zn-Br and Zn-I compared to Zn-N, while the bond lengths of Zn-Cl and Zn-N are more similar. The appearance of a Zn-halide bond is found in all studied systems containing halide ions as compared to the pure ZIFs (Supplementary Figs. 19-21).This includes ZIF-62-bImCl (with varying R, Supplementary Figs. 24-27), ZIF-4-bImCl (Supplementary Fig. ), and ZIF-8-bImCl (Supplementary Fig. ), ZIF-62-bImBr (Supplementary Fig. ), and ZIF-62-bImI (Supplementary Fig. ). Additionally, these systems exhibit notably varying amorphization/melting temperatures (200-350 °C), decreasing with increasing amount of halide modifier salt. To test the universality of our approach, we have also attempted using imidazolium chloride and pyridinium chloride as modifiers and co-melted these with the different ZIF crystals. We find that these chloride compounds also lead to transparent bulk solids (except for ZIF-4-PyCl, which is transparent but liquid-like). The ZIF-62-ImCl system was also tested by in situ X-ray diffraction as shown in Supplementary Fig. . All these samples were found to be non-crystalline (Supplementary Figs. ).