Synthesis and structure of 9-methyl-1,10-dihydropyrazolo3,4- a carbazole

The title carbazole derivative, C14H11N3, was prepared by reacting 1-hy-droxy-8-methyl-9H-carbazole-2-carbaldehyde with hydrazine hydrate. In the solid state, the fused-ring system is slightly puckered, the dihedral angle between the planes of the outer rings being 2. 24 (7) °. In the crystal, mol-ecules are linked by N-H2⋯N hy-dro-gen bonds to generate 010 chains, and weak C-H⋯π contacts consolidate the structure. A Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H⋯H (43. 1%), C⋯H/H⋯C (36. 8%) and N⋯H/H⋯N (15. 3%) inter-actions.