Received 29 January 2013
In the title solvated salt, C11H28N42+·2C24H20B-·2C3H6O, the C-N bond lengths in the central CN3 unit of the guanidinium ion are 1.3331 (16), 1.3407 (16) and 1.3454 (16) 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 [N-C-N angles = 118.96 (11), 120.51 (12) and 120.53 (11)°] 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 [1.4601 (16)-1.4649 (16) Å]. In the crystal, the guanidinium ion is connected by N-HO and C-HO hydrogen bonds with the acetone molecules. C-H interactions are present between the guanidinium H atoms and the phenyl rings of both tetraphenylborate ions. The phenyl rings form aromatic pockets, in which the guanidinium ions are embedded.
For the crystal structure of ammonium tetraphenylborate, see: Steiner & Mason (2000). For the crystal structures of choline tetraphenylborate, triethanolammonium tetraphenylborate dihydrate and 6-ammonio-n-hexanoic acid tetraphenylborate monohydrate, see: Steiner et al. (2001). For the synthesis of N''-[3-(dimethylamino)propyl]-N,N,N',N'-tetramethylguanidinium chloride, see: Tiritiris & Kantlehner (2012). For the crystal structures of alkali metal tetraphenylborates, see: Behrens et al. (2012). For the crystal structure of N,N,N',N',N''-pentamethyl-N''-[3-(trimethylazaniumyl)propyl]guanidinium bis(tetraphenylborate), see: Tiritiris (2013).
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: ZL2531 ).
The author thanks Dr F. Lissner (Institut für Anorganische Chemie, Universität Stuttgart) for the data collection.
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