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Issue 7, 2015
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Metal organic framework synthesis in the presence of surfactants: towards hierarchical MOFs?

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Abstract

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 surfactant 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 temperatures 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.

Graphical abstract: Metal organic framework synthesis in the presence of surfactants: towards hierarchical MOFs?

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Supplementary files

Article information


Submitted
24 Nov 2014
Accepted
02 Jan 2015
First published
07 Jan 2015

This article is Open Access

CrystEngComm, 2015,17, 1693-1700
Article type
Paper
Author version available

Metal organic framework synthesis in the presence of surfactants: towards hierarchical MOFs?

B. Seoane, A. Dikhtiarenko, A. Mayoral, C. Tellez, J. Coronas, F. Kapteijn and J. Gascon, CrystEngComm, 2015, 17, 1693
DOI: 10.1039/C4CE02324B

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