Dipole-Dipole Forces

Dipole–dipole interactions are electrostatic interactions of permanent dipoles in molecules. For in polar molecules some regions are always partially negative and some regions of the molecule are always partially positive. And the attractive force between the positive end of one polar molecule and the negative end of another polar molecule is a dipole-dipole interaction.

• Examples of molecules with dipole-dipole force occurring between them are two:

1. Hydrogen Chloride (HCl) molecules
2. Water (H₂O) molecules
3. Methanol (CH₃OH) molecules
4. Sulfur dichloride (SCl₂ )molecules
5. Phosphorus trichloride (PCl₃ )molecules
6. Chloromethane (CH₃Cl) molecules

• Below is a video that will explain dipole-dipole force a little more clearly:

• Her is a diagram that will also assist you in understanding the dipole-dipole force

• More information about dipole-dipole forces :

1. These interactions tend to align the molecules to increase the attraction.
2. Dipole-dipole forces are stronger than London dispersion forces.