Dipole-Dipole Interactions
Chemistry: IB Diploma Higher Level, topic 2.8.3
Permanent Dipole-Dipole Interactions
Permanent dipole-dipole interactions exist between two permanently polar molecules.
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Permanent dipoles
- Permanent dipoles have a δ- on one side and a δ+ on the other.
- The δ+ of one molecule will attract the δ- of another molecule.
- This means that the molecules will line up throughout a liquid or solid in this fashion.
- Permanent dipole-dipole forces are the second strongest molecular interaction.
Polar molecules
- Permanent dipole-dipole interactions are only possible in molecules that contain a permanent dipole.
- So they are only found between polar molecules.
Test yourself on Dipole-Dipole Interactions
A permanent dipole is labeled by which of the following?