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A copper metal-organic framework (MOF) was synthesized by transmetalation. The ditopic ligand 3-(3,5-dimethyl-pyrazol-4-yl)pentane-2,4-dione is introduced via its Mg precursor complex in which it is oxygen-coordinated. After transmetallation, the ligand acts as  N,O,O ′ linker between dinuclear, sulfato-bridged Cu(II) nodes. The resulting three-dimensional solid crystallizes in the chiral space group  I 2 1 3, with more than half of its cell volume occupied by disordered methanol and dichloromethane molecules: the coordination framework encloses a large solvent-filled region along [1 1 1] which coounts for 54.8% of the crystal volume. The structure collapses upon removal of the clathrated solvent. Sulfate-O atoms are exposed towards the solvent region and facilitate trapping of polar guest molecules. The framework topology corresponds to a  lcv  net with Vertex symbol 3·3·10 2 ·10 2 ·10 3 ·10 3 .

Controlled stepwise synthesis of a Cu-MOF: Transmetallation of a magnesium precursor to a three-dimensional framework with very high solvent content