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Calculated Energies of Hydrogen Bonds

B3LYPultrafine/3-21G

Dimer H Donor H Acceptor comment
H2ONH3 Water Ammonia Dimer H2O Water NH3 Ammonia

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -132.225489 -75.973965 -56.229129 0.022395 58.8  kJ mol-1
Vibrational zero point energy (cm-1) 12250 4182 7107 -961 -11.5  kJ mol-1
Total         47.3  kJ mol-1