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The title compounds, 6-nitro-quinazolin-4(3 H )-one (C 8 H 5 N 3 O 3 ; I ), 6-amino-quinazolin-4(3 H )-one (C 8 H 7 N 3 O; II ) and 4-amino-quinazolin-1-ium chloride-4-amino-quinazoline-water (1/1/2), (C 8 H 8 N 3  + ·Cl - ·C 8 H 7 N 3 ·2H 2 O; III ) were synthesized and their structures were determined by single-crystal X-ray analysis. In the crystals of I and II , the quinazoline mol-ecules form hydrogen-bonded dimers via N-H⋯O inter-actions. The dimers are connected by weak inter-molecular C-H⋯N and C-H⋯O hydrogen bonds, forming a layered structure in the case of I . In the crystal of II , N-H⋯N and C-H⋯O inter-actions link the dimers into a three-dimensional network structure. The asymmetric unit of III consists of two quinazoline mol-ecules, one of which is protonated, a chloride ion, and two water mol-ecules. The chloride anion and the water mol-ecules form hydrogen-bonded chains consisting of fused five-membered rings. The protonated and unprotonated quinazolin mol-ecules are linked to the chloride ions and water mol-ecules of the chain by their amino groups.

Crystal structures of 6-nitroquinazolin-4(3H)-one, 6-aminoquinazolin-4(3H)-one and 4-aminoquinazoline hemihydrochloride dihydrate