A rational approach to screen for hydrated forms of the pharmaceutical derivative magnesium naproxen using liquid-assisted grinding

Variation of water content in liquid-assisted grinding was utilised to mechanochemically screen for different hydrated forms of magnesium naproxen directly from a mixture of magnesium oxide and naproxen. Structure determination from powder and single crystal X-ray diffraction data, supported by solid-state NMR and synchrotron radiation diffraction experiments, revealed a monohydrate coordination polymer, a discrete tetrahydrate complex, and provided a preliminary structural model for a highly hydrated salt.