title: 4-Nitro-benzoic acid-2,2'-biimidazole (2/1).
abstract: In the title adduct, C(7)H(5)NO(4)·0.5C(6)H(6)N(4), the complete biimidazole molecule is generated by a crystallographic inversion centre. In the crystal, N-H⋯O and O-H⋯N hydrogen bonds connects the 4-nitro-benzoic acid and 2,2'-biimidazole units, affording multi-dimensional frameworks with graph-set descriptor R(2) (2)(9).
authors.affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People's Republic of China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.forename: Weiqun
authors.initials: W
authors.lastname: Zhu