Received 8 May 2013
In the crystal structure of the title salt, C17H32N42+·2C24H20B-, the C-N bond lengths in the CN3 unit of the guanidinium ion are 1.323 (4), 1.336 (5) and 1.337 (5) Å, indicating partial double-bond character in each. The C atom of this unit is bonded to the three N atoms in a nearly ideal trigonal-planar geometry [N-C-N angles = 117.7 (4), 120.9 (3) and 121.4 (3)°] 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 [1.452 (5)-1.484 (6) Å]. In the crystal, C-H interactions are present between guanidinium H atoms and the phenyl rings of both tetraphenylborate ions. This leads to the formation of a two-dimensional supramolecular pattern along the ab plane.
For biosorption of tetradecyl benzyl dimethyl ammonium chloride onto activated sludge, see: Ren et al. (2011). For the synthesis of N''-[3-(dimethylamino)propyl]-N,N,N',N'-tetramethylguanidinium chloride, see: Tiritiris & Kantlehner (2012). For the structures of alkali metal tetraphenylborates, see: Behrens et al. (2012). For the structures of N,N,N',N',N''-pentamethyl-N''-[3-(trimethylazaniumyl)propyl]guanidinium bis(tetraphenylborate) and N,N,N',N',N''-tetramethyl-N''-[3-(trimethylazaniumyl)propyl]guanidinium bis(tetraphenylborate) acetone disolvate, see: Tiritiris (2013a,b).
Data collection: COLLECT (Hooft, 2004); cell refinement: SCALEPACK (Otwinowski & Minor, 1997); data reduction: SCALEPACK; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: ZL2550 ).
The author thanks Dr F. Lissner (Institut für Anorganische Chemie, Universität Stuttgart) for measuring the crystal data.
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