Figure 1.
(a) Crystal structure of CuF2(H2O)2(3-chloropyridine) at 10 K showing the buckled two-dimensional hydrogen bonded layers31. Parts of neighboring CuF2(H2O)2(3-chloropyridine) molecules have been omitted to emphasize the hydrogen bonding. (b) Schematic rendering of the structure above 0.8 GPa illustrating the three dimensional network that is formed under compression. The connection in the third direction consists of intermolecular 
hydrogen bonds, as indicated by the purple dashed lines. Also included are drawings of the pressure-induced magnetic crossover and diamond anvil cell as well as a photo of CuF2(H2O)2(3-chloropyridine) on the diamond culet.