title: A second ortho-rhom-bic polymorph of 3,5-diphenyl-4H-1,2,4-triazol-4-amine.
abstract: The present crystal structure is the second ortho-rhom-bic polymorph of the title compound, C(14)H(12)N(4). Whereas the structure in Pnma with Z' = 0.5 is already known [Ikemi et al. (2002 ▶). Heterocycl. Commun.8, 439-442], the present structure crystallizes in the space group Pbca with Z' = 1. The dihedral angle between the two phenyl rings is 23.5 (4)° and the dihedral angles between central ring and the phenyl rings are 41.0 (3) and 26.3 (5)°. In the 4-amino-1,2,4-trizole fragment, the C=N distances are 1.321 (3) and 1.315 (3) Å, which are much shorter than the C-N distances of 1.367 (3) and 1.357 (3) Å. In the crystal, adjacent mol-ecules are linked by N-H⋯N hydrogen bonds.
authors.forename: Ya-Wen
authors.initials: YW
authors.lastname: Zhang
authors.forename: Jian-Quan
authors.initials: JQ
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Cheng