4-Amino-3,5-diethyl-4H-1,2,4-triazole at 100 K: chains of edge-fused R(4)(4)(10) and R(4)(4)(20) rings.

The title compound, C(6)H(12)N(4), has four crystallographically independent molecules in the asymmetric unit. Intermolecular N-H..

N-H...N and C-H...pi interactions in 4-amino-3-methyl-5-(p-tolyl)-4H-1,2,4-triazole and 4-amino-3-methyl-5-phenyl-4H-1,2,4-triazole.

The title compounds, C10H12N4, (I), and C9H10N4, (II), have been synthesized and characterized both spectroscopically and structurally. The dihedral angles between the triazole and benzene ring planes are 26.59 (9) and 42.