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Molecular porous materials form an important growth area in crystal engineering; two classes of these materials are porous peptides and metal organic frameworks (MOFs). The basic idea is simple: can we use pressure to modify pore sizes, ‘tuning’ materials towards targeted absorbates? The aims of the work are to establish how much we can compress and tune MOF selectivity; establish the factors which determine compressibility; and use pressure to obtain new porous materials.