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Calculated Energies of Hydrogen Bonds

PBEPBEultrafine_cp_opt/6-31G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -132.806157 -76.322481 -56.470493 0.013183 34.6  kJ mol-1
Vibrational zero point energy (cm-1) 12498 4455 7283 -760 -9.1  kJ mol-1
Total         25.5  kJ mol-1