title: Oxonium picrate.
abstract: The title compound, H(3)O(+)·C(6)H(2)N(3)O(7) (-), consists of one picrate anion and one oxonium cation. The oxonium cation is located on a crystallographic twofold axis and both its H atoms are disordered, each over two symmetry-equivalent positions with occupancy ratios of 0.75. The picrate anions are also located on twofold axes bis-ecting the phenolate and p-nitro groups. π-π inter-actions between the rings of the picrates [centroid-to-centroid distances of 3.324 (2) Å] connect the anions to form stacks along the a-axis direction. The stacks are further joined together by the protonated water mol-ecules through hydrogen bonds to form two-dimensional sheets extending parallel to the ab plane. The sheets are stacked on top of each other along the c-axis direction and connected through C-H⋯O inter-actions between the CH groups of the benzene rings and the picrate nitro groups, with C⋯O distances of 3.450 (2) Å.
authors.affiliation: Tianmu College, ZheJiang A & F University, Lin'An 311300, People's Republic of China.
authors.forename: Shou-Wen
authors.initials: SW
authors.lastname: Jin
authors.forename: Bing-Xia
authors.initials: BX
authors.lastname: Chen
authors.forename: Yu-Shuang
authors.initials: YS
authors.lastname: Ge
authors.forename: Hua-Bing
authors.initials: HB
authors.lastname: Yin
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Fang