title: N,N-Bis(2-hydroxy-benzyl-idene)-2,2'-bipyridyl-3,3'-dicarbohydrazide.
abstract: In the title compound, C(26)H(20)N(6)O(4), the two aroylhydrazone side groups exist as diastereomeres, both in the keto form in the crystal structure. The aroylhydrazone units support the mol-ecular conformation through an intra-molecular N-H⋯O hydrogen bond. Two mol-ecules are connected into a centrosymmetric dimer by inter-molecular N-H⋯N hydrogen bonds. These dimers are connected into chains along the a axis by inter-molecular O-H⋯O hydrogen bonds. The combination of these hydrogen bonds results in layers in the bc plane. The layers are further linked by weak C-H⋯π contacts to form a three-dimensional network structure.
authors.affiliation: College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471022, People's Republic of China.
authors.forename: Shao-Bin
authors.initials: SB
authors.lastname: Miao
authors.forename: Lu-Lu
authors.initials: LL
authors.lastname: Zang
authors.forename: Ya-Wei
authors.initials: YW
authors.lastname: Fan
authors.forename: Bao-Ming
authors.initials: BM
authors.lastname: Ji