The Lattice Energies of the Cuprous Halides

Abstract

Following exactly the method employed in the case of the silver halides the lattice energies of the cuprous halides have been calculated. The exponential constant in the empirical repulsion equation expressing the positive repulsive potential between the ions is found to be almost the same as that for the silver halides. The energies of the salts indicate that, particularly for the iodide there is not purely ionic binding. The lattice energies are calculated to be, for CuCl 216 kcal., CuBr, 208 kcal., CuI 199 kcal. The ``experimental'' values are, CuCl 221.9 kcal. CuBr 216.0 kcal. and CuI 213.4 kcal.