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The molecular dipoles can give rise to intermolecular forces of attraction.
intermolecular bonds are dominated by the mutual attraction between dipoles static - it is the case of polar molecules - or between dipoles and ions - is the case, for example, a salt that dissolves in water.
In the case of noble gases or compounds formed by nonpolar molecules can liquefy is explained by the random formation of a temporary dipole when the electrons in their orbits, they are randomly concentrated on one side of the molecule, the dipole induced in the molecules near him is an imbalance of electric charge (the so-called induced dipole) that generates mutual attraction and causes condensation of the gas. The link is then produced by these particular forces of attraction called dispersion forces or Van der Waals forces.
A special case of intermolecular bonding, which can also be when the intramolecular geometry of the molecule allows it, is the hydrogen bond. An atom
hydrogen bound to an oxygen atom (or fluorine), because of its positive polarization and its compact size, relatively high intensity attracts the atoms of oxygen (and fluorine and to a lesser extent, nitrogen) close .
That link, although weak, is responsible for the spatial conformation of proteins and nucleic acids, conformation to which the biological activity of the compounds themselves.