#Id: 8252

#Unit 1. Structure and Function of Biomolecules

There are four major DIPOLES that decide VWI

1. spontaneous (or instantaneous) dipoles

2. Dipole-Dipole Interaction

3. Induced Dipoles

4. Spontaneous Dipole-Induced Dipole Interaction

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#Unit 1. Structure and Function of Biomolecules

#Id: 8254

#Unit 1. Structure and Function of Biomolecules

Dipole-Dipole Interaction

Dipole-Dipole interactions occur between molecules that have permanent dipoles; these molecules are also referred to as polar molecules.

#Id: 8255

#Unit 1. Structure and Function of Biomolecules

Potential energy of Dipole-Dipole Interaction

V is the potential energy

μ is the dipole moment

ϵo is the vacuum permittivity.

R is the length between the two nuclei

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#Unit 1. Structure and Function of Biomolecules

The negative sign indicates that energy is released out of the system, because energy is released when bonds are formed, even weak bonds.

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#Unit 1. Structure and Function of Biomolecules