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By virtue of their open network structures and low densities, metal--organicframeworks (MOFs) are soft materials that exhibit elastic instabilities at lowapplied stresses. The conventional strategy for improving elastic stability isto increase the connectivity of the underlying MOF network, which necessarilyincreases material density and reduces porosity. Here we demonstrate analternative paradigm, whereby elastic stability is enhanced in a MOF with anaperiodic network topology. We use a combination of variable-pressuresingle-crystal X-ray diffraction measurements and coarse-grainedlattice-dynamical calculations to interrogate the high-pressure behaviour ofthe topologically aperiodic system TRUMOF-1, which we compare against that ofits ordered congener MOF-5. We show that the topology of the former quenchesthe elastic instability responsible for pressure-induced framework collapse inthe latter, much as irregularity in the shapes and sizes of stones acts toprevent cooperative mechanical failure in drystone walls. Our results establishaperiodicity as a counterintuitive design motif in engineering the mechanicalproperties of framework structures, relevant to MOFs and larger-scalearchitectures alike.

Enhanced elastic stability of a topologically disordered crystalline metal--organic framework