MFU-4 is prepared by mixing 1H,5H-benzo (1,2-d:4,5-d′)bistriazole and anhydrous zinc chloride in DMF. The sample can be heated either conventionally at 145 °C for 3 days, or by microwave irradiation at 155 °C for 10 min at 300 W. By tuning the reaction conditions, the crystal size and morphology can be addressed. By applying the reported procedure for the synthesis of MFU-4 and using ZnBr2 instead of ZnCl2 as a metal salt, an isostructural analogue was prepared, here called MFU-4-Br, comprising bromido side ligands (instead of the chlorido ligands). The newly synthetized MFU-4-Br was characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), (variable temperature) X-ray powder diffraction (XRPD) measurements and Fourier-transform infrared spectroscopy (FTIR), and the data were compared to the analyses of MFU-4 (Fig. ).