Diguanidinium Hexafluorosilicate

The crystal structure of diguanidinium hexafuorosilicate, [C(NH₂)₃]₂SiF₆, consists of regular octahedral SiF₆²⁻ anions linked through a system of hydrogen bonds to the guanidinium cations which have a planar conformation. The striking feature of the structure is the high degree of hydrogen bonding. All hydrogen atoms of the guanidinium units are involved in hydrogen bonds of the type N-H...F of length 2.901 (2), 2.908 (2) and 2.891 (1) Å. Unlike other materials belonging to the family of compounds of general formula R_x(NH_4 − x)₂MX₃, the crystals of the present compound do not display ferroelectric/ferroelastic properties.

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