Coordination of Cu(II) in Cu(NO3)2 aqueous solutions

Abstract
Two concentrated copper (II) nitrate solutions have been examined by x‐ray diffraction. The inspection of the radial distribution curves and the direct fitting of the structure functions suggested that a distorted arrangement of six oxygen atoms exists around the Cu2+ ion, probably in a tetragonally distorted, elongated octahedron. The best agreement with experimental data was achieved through a model in which extensive inner‐sphere complex formation between Cu2+ and NO3 ions takes place.