Structure of Amines Nitrogen is sp3 hybridized with a lone pair of electrons in an sp3 orbital. H3C 1079 CH3108 ammonia trimethylamine electrostatic potential map for trimethylamine Copyright 2005 Pearson Prentice Hall,Inc. => Chapter 19 11 Chapter 19 11 Structure of Amines Nitrogen is sp3 hybridized with a lone pair of electrons in an sp3 orbital. =>