Received 5 November 2012
aSchool of Materials Science and Engineering of Shandong University, 250014 Jinan, People's Republic of China,bNew Materials Institute of Shandong Academy of Sciences, 250014 Jinan, People's Republic of China, and cSchool of Environmental Science and Engineering of Shandong University, 250100 Jinan, People's Republic of China
Correspondence e-mail: firstname.lastname@example.org
In the crystal structure of the title compound, C13H7N3O·H2O, the components are associated into chains along  through strong O-HO hydrogen bonds with the free water molecules as bridging ligands. These chains are further cross-linked by C-HO and C-HN hydrogen bonds, forming a three-dimensional structure.
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BV2216 ).