- A hydrogen-bonded dimer in 6-(4-bromo-phen-yl)-3-methyl-1-phenyl-4,5- dihydro-1H-pyrazolo[3,4-b]pyridine and a chain of rings built from N - H...N and C - H...π(pyridine) hydrogen bonds in 3-(4-nitro-phen-yl)-4-phenyl-1H-pyrazolo[3,4-b]pyridine
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In 6-(4-bromo-phen-yl)-3-methyl-1-phenyl-4,5-dihydro-1H-pyrazolo[3,4-b] pyridine, C19H16BrN3, the reduced pyridine ring adopts a conformation that is close to a screw-boat form. Mol-ecules are linked by pairs of symmetry-related C - H...π(arene) hydrogen bonds into cyclic centrosymmetric dimers. Mol-ecules of 3-(4-nitro-phen-yl)-4-phenyl-1H- pyrazolo[3,4-b]pyridine, C18H12N4O2, are linked into centrosymmetric R22(8) dimers by pairs of symmetry-related N - H...N hydrogen bonds, and these dimers are linked by pairs of C - H...π(pyridine) hydrogen bonds to form a chain of edge-fused rings, or a mol-ecular ladder, along [100]. The mol-ecular aggregation in this compound is completed by two weak C - H...O hydrogen bonds, one of which links the chains along [100] into sheets.
- Quiroga, Jairo,Trilleras, Jorge,Hursthouse, Michael B.,Cobo, Justo,Glidewell, Christopher
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