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Calculated Energies of Hydrogen Bonds

PBEPBEultrafine_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) -190.696206 -76.322481 -114.367284 0.006441 16.9  kJ mol-1
Vibrational zero point energy (cm-1) 10918 4455 5597 -866 -10.4  kJ mol-1
Total         6.5  kJ mol-1