X-RAY-DIFFRACTION STUDY ON THE 1ST AND THE 2ND HYDRATION SHELL OF THE FE(III) ION IN NITRATE SOLUTIONS

Ionic coordination was investigated in Fe(NO3)3 aqueous solutions by X-ray diffraction. The experimental correlation function appears to be mainly characterized by the hydration of the cation. Satisfactory agreement with experimental data is achieved through a model in which the nitrate ions are considered devoid of any discrete interaction with the surrounding molecules, and the Fe3+ ions have an inner hydration shell of six water molecules octahedrally arranged, and a second shell of twelve water molecules. © 1979.