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Calculated Energies of Hydrogen Bonds

PBEPBE_cp/6-31G*

Dimer H Donor H Acceptor comment
H2OHCOOH Water formic acid dimer 2 H2O Water HCOOH Formic acid to O=C

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -265.883861 -76.322481 -189.554521 0.006859 18.0  kJ mol-1
Vibrational zero point energy (cm-1) 12324 4465 7025 -835 -10.0  kJ mol-1
Total         8.0  kJ mol-1