Crystal structure of N-[3-(di-methyl-amino)-prop-yl]-N',N',N'',N''-tetra-methyl-N-(N,N,N',N'-tetra-methyl-form-amid-in-ium-yl)guanidinium bis-(tetra-phenyl-borate).

Abstract

In the title salt, C15H36N6 2+·2C24H20B−, the three N—C bond lengths in the central C3N 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.