(1): C10H11N5,Mr=201.23, from water, P$$bar 1$$,a=6.913(1),b=8.198(2),c=9.212(2) Å, α=72.36(2), β=109.03(2) and γ=88.13(1)o,Dx=1.436 g/cm3,Z=2. FinalR=0.043 for 1477 observed reflections. (2): C10H11N5O,Mr=217.23, from methanol/water solution. P21/c,a=9.291(2),b=11.263(3),c=10.454(3) Å, and β=114.05(1)o,Dx=1.444, g/cm3,Z=4. FinalR0.056 for 1587 observed reflections. The data were collected on a diffractometer at room temperature. Structures were solved by direct methods and refined by anisotropic full-matrix least-squares method. In the solid state both molecules have the same conformation and are packed in similar manner. The planarity of the condensed triazole ring and its π electrons conjugation with a lone pair at N8 impose C6 sofa conformation of the saturated diazine rings. Hydroxy group in2is in an energetically unfavorable axial position. Both in1and2, N8−H ... N34 hydrogen bonds join molecules into infinite chains, and O6−H ... N1 hydrogen bonds in2span the chains into two-dimensional net. The molecules in hydrogen bonded chains and sheets have the same
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