Resumen: The effect of synthesis pH and H2O/EtOH molar ratio on the textural properties of different aluminium trimesate metal organic frameworks (MOFs) prepared in the presence of the well-known cationic surfac- tant cetyltrimethylammonium bromide (CTAB) at 120 °C was studied with the purpose of obtaining a MOF with hierarchical pore structure. Depending on the pH and the solvent used, different topologies were obtained (namely, MIL-96, MIL-100 and MIL-110). On the one hand, MIL-110 was obtained at lower tem- peratures than those commonly reported in the literature and without additives to control the pH; on the other hand, MIL-100 with crystallite sizes as small as 30 ± 10 nm could be easily synthesized in a mixture of H2O and EtOH with a H2O/EtOH molar ratio of 3.4 at pH 2.6 in the presence of CTAB. The resulting material displays a hierarchical porosity that combines the microporosity from the MOF and the non- ordered mesopores defined in between the MOF nanoparticles. Interestingly, the maximum of the pore size distribution could be varied between 3 and 33 nm. Finally, at pH 2.5 and using water as a solvent, platelets of MIL-96, a morphology never observed before for this MOF, were synthesized with a (001) preferential crystal orientation, the (001) plane running parallel to the bipyramidal cages of the MIL-96 topology.17 Idioma: Inglés DOI: 10.1039/C4CE02324B Año: 2015 Publicado en: CRYSTENGCOMM 17 (2015), 1693-1700 ISSN: 1466-8033 Factor impacto JCR: 3.849 (2015) Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 37 / 163 = 0.227 (2015) - Q1 - T1 Categ. JCR: CRYSTALLOGRAPHY rank: 4 / 26 = 0.154 (2015) - Q1 - T1 Factor impacto SCIMAGO: 1.04 - Chemistry (miscellaneous) (Q1) - Materials Science (miscellaneous) (Q1) - Condensed Matter Physics (Q1)