Acta Cryst. (2013). E69, o292
[ doi:10.1107/S1600536813001992 ]

N,N,N',N',N''-Pentamethyl-N''-[3-(trimethylazaniumyl)propyl]guanidinium bis(tetraphenylborate)

I. Tiritiris

Abstract: In the crystal structure of the title salt, C₁₂H₃₀N₄²⁺·2C₂₄H₂₀B^-, the C-N bond lengths in the central CN₃ unit of the guanidinium ion are 1.3388 (17), 1.3390 (16) and 1.3540 (17) Å, indicating partial double-bond character in each. The central C atom is bonded to the three N atoms in a nearly ideal trigonal-planar geometry and the positive charge is delocalized in the CN₃ plane. The bonds between the N atoms and the terminal C-methyl groups of the guanidinium moiety, all have values close to a typical single bond [1.4630 (16)-1.4697 (17) Å]. C-H interactions are present between the guanidinium H atoms and the phenyl C atoms of one tetraphenylborate ion. The phenyl rings form a kind of aromatic pocket, in which the guanidinium ion is embedded.

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