The effect of pressure to over 200 kbars has been measured on the lattice parameters of iodine, stannic iodide, and ofphyphen;dihyphen;iodobenzene. All three have a large component of van der Waals binding and each exhibits a compressibility which decreases with increasing pressure. On the basis of the estimated change in distances in the crystal, the approach to the metallic state in and perpendicular to theacplane in iodine is explained. The approach to the metallic state and possible bond deformation in SnI4is discussed. Possible molecular realignments inphyphen;dihyphen;iodobenzene are proposed. The results on molecular crystals are contrasted with the behavior of TlI previously published.
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