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The zwitterionic (molecular) λ 6 Ge-germanate pentafluoro[(4-methyl-1,4-bisazoniacyclohexl-yl)methyl]germanate (5) was synthesized by reaction of 1-methyl-4-[(trimethoxygermyl) methyl]piperazine (8) with HF (molar ratio 1:5) in a mixture of water and ethanol at 0 °C and isolated as the hydrate 5 · H2O. The zwitterion 5 is characterized by the presence of a hexacoordinate (formally twofold negatively charged) germanium atom and two tetracoordinate (formally positively charged) nitrogen atoms. Compound 5 · H 2 O was structurally characterized by single-crystal X-ray diffraction. Crystal data are as follows: C 6 H 17 F 5 GeN 2 O , triclinic space group P1̄ (no. 2), a = 7.5228(11) Å, b = 12.174(2) Å, c = 12.3041(14) Å, α = 73.74(2)°, β = 82.44(2)°, γ = 74.762(10)°, V = 1041.7(2) Å 3 , T = 173(2) K, Z = 4, R1 = 0.0227. There are one pair each of crystallographically independent zwitterions 5 and water molecules in the asymmetric unit, the structures of the zwitterions being very similar. Their coordination polyhedra around the germanium atoms are slightly distorted octahedra.

zeitschrift für naturforschung b

Pentafluoro[(4-methyl-1,4-bisazoniacy clohex-1 -yl)methy 1] germanate Hydrate: Synthesis and Crystal Structure of a Zwitterionic λ 6 Ge-Germanate with a GeF 5 C Framework