title: 4-(4-Pyridylamino)pyridinium perchlorate.
abstract: In the title salt, C(10)H(10)N(3) (+)·ClO(4) (-), the 4-(4-pyridylamino)-pyridinium cations are linked into chains via N-H⋯N hydrogen bonding and into layers by C-H⋯π inter-actions [C⋯Cg = 3.3875 (19) Å]. Perchlorate ions are anchored to the layer motifs by N-H⋯O hydrogen bonding. The perchlorate anion was found to be disordered about a Cl-O axis, with two sites, each of equal occupancy, being resolved for the three remaining O atoms.
authors.affiliation: Lyman Briggs College, Department of Chemistry, Michigan State University, East Lansing, MI 48825, USA.
authors.forename: Gregory A
authors.initials: GA
authors.lastname: Farnum
authors.forename: Robert L
authors.initials: RL
authors.lastname: Laduca