Molecules that have both hydrogen bond accepting and donating capabilities tend to display physical properties characteristic of higher molecular weight systems (Section C).
Type of interaction Example Magnitude (kJ mol-1)
Covalent H-H 200-800
Ionic Na+ Cl-40-400
Ion-dipole Na+ (H2O)n 4-40
Hydrogen bond H2O...H2O 4-40
Dipole-dipole SO2 SO2 0.4-4.0
Figure 1. Hydrogen bond acceptors and donators.