title: 2-(4-Amino-phen-yl)-1-phenyl-diazenium 2,4,6-trinitro-phenolate.
abstract: In the title salt, C(12)H(12)N(3) (+)·C(6)H(2)N(3)O(7) (-), the diazenyl group of the 4-(phenyl-diazen-yl)aniline mol-ecule is protonated and forms a hydrogen bond with the phenolate O-atom acceptor of the picrate anion. Structure extension occurs through two symmetrical inter-ion three-centre amine N-H⋯O,O'(nitro) hydrogen-bonding associations [graph set R(1) (2)(4)], giving a convoluted two-dimensional network structure.
authors.forename: Graham
authors.initials: G
authors.lastname: Smith
authors.forename: Urs D
authors.initials: UD
authors.lastname: Wermuth
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: White