Received 11 March 2013
The title compound, C7H7N3, is an orthorhombic polymorph that crystallizes in the space group Pca21. The previously reported monoclinic form [Geiger & Parsons (2013) Acta Cryst. E69, o452] crystallizes in the space group P21/c (Z = 4). In the crystal, two independent HN-HNC hydrogen bonds link the molecules into chains along the a-glide plane. Two further independent HN-HNH2 hydrogen bonds join the chains, forming a three-dimensional network.
For the structure of the monoclinic polymorph of the title compound, see: Geiger & Parsons (2013). For the structures of the two crystalline forms of 1,2-diaminobenzene, see: Czapik & Gdaniec (2010); Stålhandske (1981).
Data collection: APEX2 (Bruker, 2010); cell refinement: SAINT (Bruker, 2010); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XSHELL (Bruker, 2010) and Mercury (Macrae et al., 2008); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: QK2056 ).
This work was supported by a Congressionally directed grant from the US Department of Education (grant No. P116Z100020) for the X-ray diffractometer
Bruker (2010). APEX2, SAINT, SADABS and XSHELL. Bruker AXS Inc., Madison, Wisconsin, USA.
Czapik, A. & Gdaniec, M. (2010). Acta Cryst. C66, o198-o201.
Geiger, D. K. & Parsons, D. E. (2013). Acta Cryst. E69, o452.
Macrae, C. F., Bruno, I. J., Chisholm, J. A., Edgington, P. R., McCabe, P., Pidcock, E., Rodriguez-Monge, L., Taylor, R., van de Streek, J. & Wood, P. A. (2008). J. Appl. Cryst. 41, 466-470.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Stålhandske, C. (1981). Cryst. Struct. Commun. 10, 1081-1086.
Westrip, S. P. (2010). J. Appl. Cryst. 43, 920-925.