N,N,N′,N′-Tetra­methyl-N′′-[3-(trimethyl­aza­nium­yl)prop­yl]guanidinium bis­(tetra­phenyl­borate) acetone disolvate

In the title solvated salt, C11H28N4(2+)·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-H⋯O and C-H⋯O hydrogen bonds with the acetone mol-ecules. C-H⋯π inter-actions are present between the guanidinium H atoms and the phenyl rings of both tetra-phenyl-borate ions. The phenyl rings form aromatic pockets, in which the guanidinium ions are embedded.