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Calculated Energies of Hydrogen Bonds

B3LYP/CEP-121G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -39.993271 -17.177811 -22.806519 0.008942 23.5  kJ mol-1
Vibrational zero point energy (cm-1) 10892 4523 5637 -732 -8.8  kJ mol-1
Total         14.7  kJ mol-1