Thus, while none of the O 1 N or O 1 H bond distances were predicted to be within the range of strong hydrogen bonds, all systems are well within the expected range for moderate hydrogen bonds, with one amine substituent in the nh1 systems and with both amine substituents in the nh1nh1 ′ systems. Across all systems, the nh1nh1 ′ THF system is predicted to have the highest dissociation energy. In conjunction with its A H B distances being within the range of moderate hydrogen bonding with both amine substituents, this research supports the idea that there is significant hydrogen bonding transpiring, which would help explain the high dipole moments of this system.