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In the title molecule, C20H12ClN3O, the triazoloisoquinoline ring system is nearly planar, with an r.m.s. deviation of 0.018 (3) Å and a maximum deviation of 0.034 (3) Å from the mean plane for the triazole ring C atom which is bonded to the benzene ring. The furan and benzene rings are twisted by 59.71 (14) and 66.95 (10)°, respectively, with respect to the mean plane of the triazoloisoquinoline ring system. The molecular conformation is stabilized by an intramolecular π–π interaction [centroid-to-centroid distance = 3.5262 (18) Å]. The crystal packing is stabilized by weak C—H...π interactions and weak π–π interactions [centroid-to-centroid distance = 3.9431 (17) Å].