As the structure is anisotropic, doping with bod also changes the compressibility differently in different directions. The interlayer direction becomes notably stiffer, with compressibility dropping to 24.7(4) TPa -1 (x = 0.10) and 24.70(11) TPa -1 (x = 0.20). Within the plane, the inorganic X 2 axis becomes slightly stiffer, 12.6(2) TPa -1 (x = 0.10) and 14.1(3) TPa -1 (x = 0.20), whereas the organic X 3 axis in fact softens, 8.14( ) TPa -1 (x = 0.10) and 8.9(4) TPa -1 (x = 0.20) [ESI Table ]. This suggests that organic substitution can be used to subtly modify the compressibility of MOMs, as found for MOFs, and hence the efficacy of strain tuning, whether in bulk or on surface. ]. All the samples are canted (weak) ferromagnets, with a ferromagnetic ordering temperature T C = 17(1)) K, and substantial magnetic hysteresis [Fig. ]. By contrast, the field dependence of the magnetism systematically varies on doping with bod, with the more bod added the softer the magnet [Fig. (d), ESI Table ]. The drop in hysteresis can be seen most clearly in the coercive field, H c , which decreases by 60% on doping with 33% bod (i.e. x = 0.33). The reduction in hysteresis suggests that the O atom has weaker spin-orbit coupling and is more electronegative, reducing the ligand field, which will together reduce the single-ion anisotropy. It is also possible that the slight differences in tilt angles between NiCl 2 chains induced by the differences in internal bond angles between bod and btd change the degree of canting, though this is not clearly observed, and the changes in H c are much larger than predicted by geometry alone.