Crystal structure and Hirshfeld surface analysis of 5-oxo-7-phenyl-2-(phenyl-amino)-1H-[1,2,4]triazolo[1,5-a]pyridine-6,8-dicarbo-nitrile dimethyl sulfoxide monosolvate.

Abstract

In the title compound, C20H12N6O·C2H6OS, the [1,2,4]triazolo[1,5-a]pyridine ring system is almost planar and makes dihedral angles of 16.33 (7) and 46.80 (7)°, respectively, with the phenyl-amino and phenyl rings. In the crystal, mol-ecules are linked by inter-molecular N-H⋯O and C-H⋯O hydrogen bonds into chains along the b-axis direction through the dimethyl sulfoxide solvent mol-ecule, forming C(10)R 2 1(6) motifs. These chains are connected via S-O⋯π inter-actions, π-π stacking inter-actions between the pyridine rings [centroid-to-centroid distance = 3.6662 (9) Å] and van der Waals inter-actions. A Hirshfeld surface analysis of the crystal structure indicates that the most important contributions to the crystal packing are from H⋯H (28.1%), C⋯H/H⋯C (27.2%), N⋯H/H⋯N (19.4%) and O⋯H/H⋯O (9.8%) inter-actions.