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The results of a single crystal X-ray structure determination of monoclinic (MeNH 3 ) 2 SiF 6  are reported: a = 962.3(5), b = 964.4(1), c = 966.4(5) pm, " = 100.03(3)°; V = 883.2(7) Å 3 , Z = 4, space group C2/c; wR 2  = 0.0999 based on F 0  2  of 1291 independent reflections (including H refinement without restrictions). The structure is related to that of (NH 4 ) 2 SiF 6 , but contains the dumb-bells of the cations well oriented along the greater cell diagonals and fixed by one nearly linear and two bi-furcated hydrogen bonds (N...F: 281 and 293 - 305 pm, resp.). The [SiF 6 ] 2-  octahedron is nearly undistorted with average bond length Si-F: 167.7 pm (169.9 pm corrected for thermal motion)

zeitschrift für naturforschung b

Die Kristallstruktur von Bis-[methylammonium]-hexafluorosilikat, (MeNH 3 )2SiF 6  / The Crystal Structure of Bis-[methylammonium]-hexafluorosilicate, (MeNH 3 ) 2 SiF 6