title: Pyridine-2,5-diamine.
abstract: In the title mol-ecule, C5H7N3, intra-cyclic angles cover the range 117.15 (10)-124.03 (11)°. The N atoms of the amino groups have trigonal-pyramidal configurations deviating slightly from the pyridine plane by 0.106 (2) and -0.042 (2) Å. In the crystal, the pyridine N atom serves as an acceptor of an N-H⋯N hydrogen bond which links two mol-ecules into a centrosymmetric dimer. Inter-molecular N-H⋯N hydrogen bonds between the amino groups further consolidate the crystal packing, forming a three-dimensional network.
authors.affiliation: D. Ghitu Institute of Electronic Engineering and Nanotechnologies, 3/3 Academy str., MD-2028 Chisinau, Moldova.
authors.forename: Sergiu
authors.initials: S
authors.lastname: Draguta
authors.forename: Victor N
authors.initials: VN
authors.lastname: Khrustalev
authors.forename: Marina S
authors.initials: MS
authors.lastname: Fonari
authors.forename: Mikhail Yu
authors.initials: MY
authors.lastname: Antipin
authors.forename: Tatiana V
authors.initials: TV
authors.lastname: Timofeeva