title: 2,2',4,4'-Tetra-methyl-7,7'-diazenediylbis(1,8-naphthyridin-1-ium) bis-(perchlorate).
abstract: In the title salt, C(20)H(20)N(6) (2+)·2ClO(4) (-), the cation is disposed about a center of symmetry at the mid-point of the N=N bond. The 1,8-naphthyridine systems are planar and the ten atoms have a mean deviation of 0.01 Å from the least-squares plane. The two planar 1,8-naphthyridine units are parallel but extend in opposite directions from the diazene bridge. The 1,8-naphthyridine aminium groups inter-act with perchlorate O atoms through N-H⋯O hydrogen bonds.
authors.affiliation: College of Animal Husbandry and Veterinary Studies, Henan Agricultural University, Zhengzhou, Henan Province 450002, People's Republic of China.
authors.forename: Juan
authors.initials: J
authors.lastname: Mo
authors.forename: Li
authors.initials: L
authors.lastname: Yuan
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Liu
authors.forename: Wen
authors.initials: W
authors.lastname: Chen
authors.forename: Xin-Sheng
authors.initials: XS
authors.lastname: Li