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Calculated Energies of Hydrogen Bonds

MP2/CEP-121G*

Dimer H Donor H Acceptor comment
H2OH2CO water formaldehyde dimer H2O Water H2CO Formaldehyde

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -39.691659 -17.047937 -22.634200 0.009522 25.0  kJ mol-1
Vibrational zero point energy (cm-1) 10832 4488 5634 -710 -8.5  kJ mol-1
Total         16.5  kJ mol-1