Hexaaquacopper(II) dinitrate: absence of Jahn-Teller distortion

In the title compound, [Cu(H2O)(6)](NO3)(2), the geometry around the Cu II ion is approximately octahedral, formed by six O atoms from the coordinated water molecules. The Cu-O distances are rather similar [2.014 (2)-2.084 (2) angstrom] and not related by symmetry. The Jahn-Teller effect is, at best, only weakly observed in this structure, in contrast to many other structures where the hexaaquacopper( II) ion has been characterized. An extensive mesh of hydrogen-bond interactions between the coordinated water molecules and nitrate ions is a feature of the structure and may limit the degree to which the Jahn-Teller effect can be observed.