Crystallographic and spectroscopic characterization of 5-chloro-pyridine-2,3-di-amine.

The two -amino groups of the title compound, CHClN, twist out of the plane of the mol-ecule to minimize intra-molecular inter-action between the amino hydrogen atoms. In the crystal, the amino groups and the pyridine N atom engage in inter-molecular hydrogen bonding. The mol-ecules pack into spiral hydrogen-bonded columns with offset face-to-face π-stacking.