N,N,N′,N′-Tetra­methyl­guanidinium tetra­phenyl­borate

In the title salt, C(5)H(14)N(3) (+)·C(24)H(20)B(−), the C—N bond lengths in the central CN(3) unit are 1.3322 (11), 1.3385 (12) and 1.3422 (12) Å, indicating partial double-bond character. The central C atom is bonded to the three N atoms in a nearly ideal trigonal-planar geometry [N—C—N angles = 119.51 (8), 119.81 (9) and 120.69 (8)°] and the positive charge is delocalized in the CN(3) plane. The bond lengths between the N atoms and the terminal methyl groups all have values close to a typical single bond [1.4597 (12)–1.4695 (13) Å]. The crystal packing is caused by electrostatic inter­actions between cations and anions.