title: 3,6-Bis(2-pyridyl)di-1,2,4-triazolo[3,4-a:4',3'-c]phthalazine.
abstract: The title compound, C20H12N8, (I), has been prepared by the reaction of 1,4-dihydrazinophthalazine and pyridine-2-carboxaldehyde, followed by an oxidative cyclization by treatment with bromine. In the solid state, the molecules of (I) are discrete, comprising a fused and twisted four-ring system with an overall helical appearance. The distance between the two intramolecular pyridyl N atoms is 3.075 (2) A, this short contact distance suggesting a pi-pi interaction.
authors.affiliation: Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan.
authors.forename: Wen-Fu
authors.initials: WF
authors.lastname: Chang
authors.forename: Yuh-Sheng
authors.initials: YS
authors.lastname: Wen
authors.forename: Ling-Kang
authors.initials: LK
authors.lastname: Liu
mesh_terms: D000959:Antihypertensive Agents / Q000138:chemical synthesis / Q000737:chemistry; D018360:Crystallography, X-Ray; D015394:Molecular Structure; D010793:Phthalazines / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000138:chemical synthesis / Q000737:chemistry*; D014230:Triazoles / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D000959:Antihypertensive Agents; D010793:Phthalazines; D011725:Pyridines; D014230:Triazoles