Dimethylammonium 4-nitrophenolate-4-nitrophenol (1/1)

The title compound, C(2)H(8)N(+)center dot C(6)H(4)NO(3)(-)center dot C(6)H(5)NO(3), was synthesized from dimethylamine and 4-nitrophenol in an overall yield of 85%. The dihdral angles between the nphenyl rings and their attached nitro groups are 5.7 (6) and 2.5 (7)degrees. In the crystal, there are strong hydrogen bonds between the ammonium group and the nitrophenol and nitrophenolate O atoms, and between the nitrophenol and nitrophenolate O atoms, forming a chain along the b-axis direction.