H. Fun, S. Chantrapromma, S. Jana
Aug 6, 2008
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Journal
Acta Crystallographica Section E: Structure Reports Online
Abstract
The title chloro-substituted 2-aminopyrimidine, C4H3Cl2N3, is a second monoclinic polymorph of this compound which crystallizes in the space group C2/c. The structure was previously reported [Clews & Cochran (1948 ▶). Acta Cryst. 1, 4–11] in the space group P21/a. There are two crystallographically independent molecules in the asymmetric unit and each molecule is planar. The dihedral angle between the two pyrimidine rings is 30.71 (12)°. In the crystal structure, molecules are linked via N—H⋯N intermolecular hydrogen bonds, forming infinite one-dimensional chains along the a axis. These hydrogen bonds generate R 2 2(8) ring motifs. The chains are stacked along the b axis.