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The effect of pressure on a nickel aspartate framework

Abstract The hydrostatic compression of the chiral metal-organic framework [Ni(L–Asp)(H2O)2]·H2O (NiAsp–I) has been studied to 6.07 GPa by single crystal X-ray diffraction. Over the course of this pressure range the compound undergoes a phase transition between 0.58 GPa and 1.26 GPa, yielding NiAsp–II. Both polymorphs are orthorhombic, P212121, and feature 1D chains of Asp–Ni–Asp moieties. During the transition, the Ni(II) octahedra rotate, resulting in a dramatic shift in the position of the axial bonds with respect to the direction of polymer formation, and gives rise to an anisotropic compression of the unit cell dimensions.