MUV-1-F shows a high thermal stability until decomposition at around 350 °C (Fig. ). Importantly, the functional group of this material forms part of the organic ligand and, as thermogravimetric analysis measurement shows, there is no mass loss due to the detachment of the functional group, as observed in other 2D materials, where a mass loss corresponding to the extrusion of the functional groups is observed. The functional groups are located at the surface, thus playing an active role in the chemical behavior of the molecular interface. In this sense, the use of halogen groups enhances the chemical stability of the materials due to their high hydrophobicity, preventing hydrolysis of sensible materials, typical of Fe(II) compounds. This behaviour was measured by continuous contact angle (Fig. ), presenting values of contact angles of 135° (hydrophobic behaviour). b) The "sandwich" structure for the MUV-1-F layers, formed by a core composed by the Fe(II) centers and imidazole bridges, locating the functionalities in the surface.