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The structures of two phases of the title compound, C10H8N2O2.H2O, are reported. While the organic molecule has very nearly the same molecular geometry in the two phases, the hydrogen-bonding patterns are quite different. In each case, however, a three-dimensional network of hydrogen bonds is formed. In the α phase, six N—H...O hydrogen bonds have donor–acceptor distances ranging from 2.681 (2) to 3.206 (2) Å, while three O—H...O hydrogen bonds range from 2.837 (2) to 3.173 (2) Å, and in the β phase, four N—H...O hydrogen bonds range from 2.668 (2) to 3.038 (2) Å, while two O—H...O hydrogen bonds are 2.951 (3) and 2.959 (3) Å in length.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, alpha, beta

hkl

Structure factor file (CIF format)
Contains datablock alpha

hkl

Structure factor file (CIF format)
Contains datablock beta

CCDC references: 128646; 128647

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