Abstract
Neutron diffraction experiments were carried out on isotopically labelled copper chloride (CuCl2) salt in a 4 molal aqueous solution. The first- and second-order isotopic difference methods were used to obtain structural information on the hydration structure of the Cu2+ and Cl- ions and to calculate the pair distribution functions gCuCl(r) and gClCl(r) The results confirm the highly distorted nearest-neighbour coordination of Cu2+, and give direct evidence that Cu-Cl contacts exist over a range 2.3<or=r (AA)<or=3.5. Analysis of gClCl(r) gives consistent information with that of gCuCl(r) and shows that direct contacts also exist between Cl- ions, over the range 2.8<or=r (AA)<or=4.2.
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