Chapter 10, Problem 10B.2E

Interpretation Introduction

Interpretation:

The energy of interaction between benzene ring and the electric dipole moment of the neighboring peptide group has to be calculated using the given data.

Concept introduction:

Polar molecules are the molecules having a positive and negative end and so there will be a charge separation.

A polar molecule is a molecule where the polar bonds are asymmetrically arranged (the dipoles do not cancel)

A nonpolar molecule is a molecule with no polar bonds or a molecule where the polar bonds are symmetrically arranged.

In polar molecule the charge separation occurred with respect to the difference in electronegativity of atoms in the molecule.

Interaction between dipole and an induced dipole:

$\begin{array}{c}\text{V}\left(\text{r}\right)\text{=}-\frac{{\text{μ}}^{\text{2}}{}_{\text{1}}{\text{α}}_{\text{2}}{}^{\text{'}}}{{\text{4πε}}_{\text{0}}{\text{r}}^{\text{6}}}\\ \\ {\text{μ}}_{\text{1}}\text{-}\text{Dipole}\text{moment}\text{of}\text{the}\text{polar}\text{molecule}\text{.}\\ {\text{α}}_{\text{2}}{}^{\text{'}}\text{-}\text{Polarizability}\text{volume}\text{of}\text{molecule2}\\ \text{r-}\text{Separation}\\ \text{ε}\text{-}\text{Permitivity}\text{of medium}\\ \end{array}$