Abstract
In the title salt, C16H34N5O3 +·C24H20B−, the C—N bond lengths in the cation are 1.3368 (16), 1.3375 (18) and 1.3594 (17) Å, indicating partial double-bond character. 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. In the crystal, weak C—H⋯O contacts are observed between neighbouring guanidinium ions and between guanidinium ions and tetraphenylborate anions. In addition, C—H⋯π interactions involving guanidinium H atoms and aromatic rings of the anion are present. The phenyl rings form aromatic pockets, in which the cations are embedded. This leads to the formation of a two-dimensional supramolecular pattern along the ab plane.
Highlights
For the crystal structure of N,N,N0,N0 -tetramethylurea, see: Frampton & Parkes (1996)
Cg1 and Cg2 are the centroids of the C29–C34 and C35–C40 rings, respectively
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
Summary
Cg1 and Cg2 are the centroids of the C29–C34 and C35–C40 rings, respectively. Symmetry codes: (i) x; y þ 12; z 12; (ii) x; y; z 1; (iii) x þ 1; y; z þ 1. For the crystal structure of N,N,N0 ,N0 -tetramethylurea, see: Frampton & Parkes (1996). N,N,N0 ,N0 -tetramethylchloroformamidinium chloride, see: Tiritiris & Kantlehner (2008a). For the crystal structures of alkali metal tetraphenylborates, see: Behrens et al (2012). For the crystal structure of 2-dimethylamino-1-(2-ethoxy-2oxoethyl)-3-methyl-3,4,5,6-tetrahydropyrimidin-1-ium tetraphenylborate, see: Tiritiris & Kantlehner (2012a). For the crystal structure of N,N,N0 ,N0 ,N00 -pentamethyl-N00 -[3-(1,3,3trimethylureido)propyl]guanidinium tetraphenylborate, see: Tiritiris & Kantlehner (2012b). For the synthesis of N00 -[3(1,3,3-trimethylureido)propyl]-N,N,N0 ,N0 -tetramethylguanidine, see: Tiritiris & Kantlehner (2013)
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