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Calculated Energies of Hydrogen Bonds

MP2/CEP-121G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -28.660941 -17.047937 -11.599869 0.013135 34.5  kJ mol-1
Vibrational zero point energy (cm-1) 12625 4488 7360 -777 -9.3  kJ mol-1
Total         25.2  kJ mol-1