[Ag(OH2)2][Ag(SO4)2]: A Hydrate of a Silver(II) Salt

When exposed to air at ambient conditions, AgSO4 slowly reacts with moisture, yielding AgSO4⋅H2O. The crystal structure determination (powder data) shows that it may be described as [Ag(OH2)2][Ag(SO4)2], with some sulfate groups being shared between different Ag2+ cations, resembling in that way its Cu2+ analogue. [Ag(OH2)2][Ag(SO4)2], the first hydrate of a compound of Ag2+, was extensively characterized using many physicochemical methods.