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Coulombic intermolecular interactions in crystalline hydrocarbons were studied by means of molecular packing analysis. A C-H charge separation parameter of 0.36 e was found by analysis of nine aromatic and nine saturated hydrocarbon crystal structures. When coulombic point charges were included in the non-bonded potential model it was found that the geometric-mean combining law held for C. . .H repulsions. The calculated coulombic energy of the hydrocarbons studied ranged from a negligible amount for n-hexane to a maximum contribution of 29% of the total lattice energy for crystalline benzene.
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