N-(2,4-Dimethoxybenzylideneamino)guanidiniurn Dihydrogenphosphate

Abstract

In the asymmetric unit of the title compound, C<inf>10</inf>H <inf>15</inf>-N<inf>4</inf>O<inf>2</inf>+·H<inf>2</inf>PO <inf>4</inf>-, there are two protonated aminoguanidinium cations and two dihydrogenphosphate anions. The positive charge on the protonated amidine group is delocalized over the three C-N bonds in a manner similar to that found in guanidinium salts. The aminoguanidinium cations are found to be the E-isomer structures. Intramolecular interactions of the N-H⋯N type are observed, leading to the formation of five-membered rings. Extensive networks of O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds stabilize the three-dimensional network. In the crystal structure, π-π interactions between the benzene rings, with a distance of 3.778 (2) Å between the ring centroids, also affect the packing of the molecules. © 2005 International Union of Crystallography.