A purple odyssey: synthesis and structure of 3-amino-4-hy­dr­oxy-6-oxo­cyclo­hexa-2,4-dien-1-iminium chloride monohydrate

In the cation of the title hydrated mol­ecular salt, C6H7N2O2+·Cl−·H2O, the six-membered ring shows unequal bond lengths consistent with delocalization of electrons over two separate 6π systems with single bonds between them. In the crystal, the components are linked by N—H⋯Cl, N—H⋯O, O—H⋯Cl and O—H⋯O hydrogen bonds, generating double layers propagating in (100).