). For all of the scrambled MOPs there is a significant presence of the other possible compositions in the crystal structure, but the statistically most likely composition matches the composition that was targeted (Fig. ). The average composition of the cages as determined by NMR digestion experiments is close to that determined from the single crystal diffraction data (Fig. ), with the discrepancies attributed to the uncertainty arising from the disorder in the structure. As the content of the ligand CH3L 2-increases within the material, a smooth increase in the length of the c-axis of the P21/n unit cell is observed, from 24.9013(2) to 25.7952(1) Å for the homoleptic cages [Cu4(L)4]-DMA and [Cu4(CH3L)4]-DMA at either end of the series, respectively. This behaviour fits with Vegard's law, as has been observed previously for alloys of porous organic cages, and in keeping with the solid solution behaviour of the samples (Fig. ). This trend is due to the crystal packing of the molecules, in which the methyl groups of the ligand CH3L 2-point approximately along the c-axis, causing the increase in the cell dimension as the occupancy increases (Fig.