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Calculated Energies of Hydrogen Bonds

PBEPBE_cp_opt/6-31G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -190.697173 -76.322481 -114.367284 0.007408 19.5  kJ mol-1
Vibrational zero point energy (cm-1) 10947 4465 5609 -873 -10.4  kJ mol-1
Total         9.0  kJ mol-1