Résumé
An extended series of MIL-53 (M)_X (MIL stands for Materials of Institute Lavoisier) with M=Al, Cr, Fe, Sc and X=-Cl,-CH3 and-NO2 was considered to systematically explore the impact of the nature of both the metal center and the grafted functions on the mechanical behavior of this highly flexible framework under the application of an external pressure up to 3 GPa. The high-pressure X-ray diffraction measurements allowed the characterization of the pressure-induced phase transitions of the hydrated structures, the associated volume changes/pressure transitions and their mechanical resilience via the determination of their bulk moduli.