Acta Cryst. (2008). E64, o1659-o1660  [ doi:10.1107/S1600536808023714 ]

A second monoclinic polymorph of 2-amino-4,6-dichloropyrimidine

H.-K. Fun, S. Chantrapromma, S. Jana, R. Chakrabarty and S. Goswami

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-HN intermolecular hydrogen bonds, forming infinite one-dimensional chains along the a axis. These hydrogen bonds generate R²₂(8) ring motifs. The chains are stacked along the b axis.

Online 6 August 2008

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