Acta Cryst. (2005). E61, o2706-o2708 [ doi:10.1107/S1600536805023445 ]
Abstract: The title compound (systematic name: 4-amino-2-thioxo-2,3-dihydropyrimidin-1-ium chloride), C4H6N3S+·Cl-, has two cations and two anions in the asymmetric unit. The two cations have nearly the same structure. Both are nearly planar, the largest distance from the non-H atoms to the least-squares plane through the six-membered ring atoms being 0.010 (2) Å. Both Cl- ions serve as hydrogen-bond acceptors. One thiocytosinium cation forms N-HCl hydrogen bonds with three Cl- anions and the other one with four Cl- ions, giving a sheet parallel to (101). There is also an N-HS intermolecular hydrogen bond.
Online 27 July 2005
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