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inorganic compounds
A structure of copper hexafluorosilicate-deuterium oxide (1/4), CuSiF6.4D2O, has been established by single-crystal neutron diffraction in order to describe the hydrogen-bonding system. It crystallizes in the monoclinic system, space group P21/c. The structure comprises SiF6 and Cu(D2O)4F2 octahedra. A common F atom allows the formation of chains along the [101] direction; these chains are linked by hydrogen bonds.