Crystal structure of N-[3-(di­methyl­amino)­prop­yl]-N′,N′,N′′,N′′-tetra­methyl-N-(N,N,N′,N′-tetra­methyl­form­amid­in­ium­yl)guanidinium bis­(tetra­phenyl­borate)

In the title salt, C(15)H(36)N(6) (2+)·2C(24)H(20)B(−), the three N—C bond lengths in the central C(3)N unit of the bis­amidinium ion range between 1.388 (3) and 1.506 (3) Å, indicating single- and double-bond character. Furthermore, four C—N bonds have double-bond character. Here, the bond lengths range from 1.319 (3) to 1.333 (3) Å. Delocalization of the positive charges occurs in the N/C/N and C/N/C planes. The dihedral angle between both N/C/N planes is 70.5 (2)°. In the crystal, C—H⋯π inter­actions between H atoms of the cation and the benzene rings of both tetra­phenyl­borate ions are present. The benzene rings form aromatic pockets, in which the bis­amidinium ion is embedded. This leads to the formation of a two-dimensional supra­molecular pattern along the ab plane.