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The asymmetric unit of title compound, C18H16O2, contains two mol­ecules with slightly different conformations. In the first mol­ecule, the two phenyl rings make dihedral angles of 84.98 (11)° and the five-membered ring makes dihedral angles of 84.80 (12) and 73.00 (12)° with the phenyl rings; the corresponding angles for the second mol­ecule are 86.74 (11), 81.20 (13) and 71.36 (12)°. O—H...O hydrogen bonds between the hy­droxy and carbonyl groups are a feature of the crystal packing, which results in chains extending parallel to [100]. Weak C—H...O and C—H...π inter­actions are also observed.

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The title compound, C8H8N2O4, is almost planar (r.m.s. deviation = 0.037 Å) and an intra­molecular N—H...O hydrogen bond generates an S(6) ring. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R22(8) loops. Inter­molecular N—H...O hydrogen bonds (involving the same H atom that forms the intra­molecular hydrogen bond) link the dimers into infinite sheets lying parallel to (102).
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