Crystal Structures of the NH3OHCl·NH3O and 2(NH3OHCl)·NH3O Hydroxylamine Hydrochloride Hydroxylaminosolvates

Abstract

Cocrystals of hydroxylammonium chloride with hydroxylamine in 1:1 (NH₃OHCl·NH₃O, structure I) and 2:1 (2(NH₃OHCl)·NH₃O, structure II) ratios are prepared and structurally characterized. The structures of both cocrystals are determined by XRD: the structures crystallize in the monoclinic crystal system, both in the P2₁/c space group. It is established that the NH₃O ammonia oxide zwitter ion forms an exceptionally large number of contacts (11 in I and 12 in II). The main differences between the structures of I and II are manifested in the supramolecular organization of their crystal packings: hydroxylamine acts as a hydrogen donor for four hydrogen bonds and a hydrogen acceptor for other four hydrogen bonds in I and as a hydrogen donor for six hydrogen bonds and a hydrogen acceptor for three hydrogen bonds in II.