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Calculated Energies of Hydrogen Bonds

B3LYP_cp/6-31G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -190.915494 -76.408954 -114.500473 0.006068 15.9  kJ mol-1
Vibrational zero point energy (cm-1) 10946 4462 5654 -830 -9.9  kJ mol-1
Total         6.0  kJ mol-1