Ch431_Lec

Interaction Type

Example Average Strength, kcal/mol (kJ/mol) Range**

Charge-charge (ionic)

5 (20) [in water solution] 1/r

Charge-dipole

1/r²

Dipole-dipole

1/r³

Charge-induced dipole

Dipole-induced dipole*

0.1-0.2 (0.4-4) 1/r⁶

Dispersion*

0.1-0.2 (0.4-4) 1/r⁶

Hydrogen bond

3-8 (12-30)

van der Waals repulsion 1/r¹²

Last modified 5 September 2008

Interaction Type	Example	Average Strength, kcal/mol (kJ/mol)	Range**
Charge-charge (ionic)		5 (20) [in water solution]	1/r
Charge-dipole			1/r²
Dipole-dipole			1/r³
Charge-induced dipole
Dipole-induced dipole*		0.1-0.2 (0.4-4)	1/r⁶
Dispersion*		0.1-0.2 (0.4-4)	1/r⁶
Hydrogen bond		3-8 (12-30)
van der Waals repulsion			1/r¹²