Structure of Amines H:C H 107 CH3 1089 ammonia trimethylamine electrostatic potential map for trimethylamine Copyright2010 Pearson Prentice Hall,Inc. Nitrogen is sp3 hybridized with a lone pair of electrons. The angle is less than 109.5. Chapter 19 11Chapter 19 11 Structure of Amines ▪ Nitrogen is sp3 hybridized with a lone pair of electrons. ▪ The angle is less than 109.5º