Crystal structure of N′′-(2-eth­oxy-2-oxoeth­yl)-N,N,N′,N′-tetra­methyl-N′′-[3-(1,3,3-tri­methyl­ureido)prop­yl]guanidinium tetra­phenyl­borate

In the title salt, C(16)H(34)N(5)O(3) (+)·C(24)H(20)B(−), 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 CN(3) 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.