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Unformatted text preview: Lec-33: Intermolecular forces Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 1 Ion-dipole Interactions An ion-dipole interaction occurs between an ion and the partial charge of a molecule with a permanent dipole. The cluster of water molecules that molecules that surrounds an ion in aqueous medium is a sphere of hydration. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 2 Nov 16, 2011 Water molecules ARE dipoles. Dipoles are compounds with elements that have opposite charges dipole-dipole Interactions Dipole-dipole interaction Dipole-dipole interactions are attractive forces between polar between polar molecules Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 3 Dipole-dipole Interactions The hydrogen bond is a special class of a special class of dipole-dipole interactions due to its strength strength. Polar molecules containing O-H, N-H and F-H bonds Have especially large Have especially large dipole-dipole interactions Hydrogen bonding serve to define the unique properties of H O...
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- Fall '11