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Calculated Energies of Hydrogen Bonds

B3LYP/6-31G(2df,p)

Dimer H Donor H Acceptor comment
H2OHCOOH Water formic acid dimer 1 H2O Water HCOOH Formic acid to O-C

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -266.208950 -76.426078 -189.768383 0.014489 38.0  kJ mol-1
Vibrational zero point energy (cm-1) 12267 4528 7105 -634 -7.6  kJ mol-1
Total         30.5  kJ mol-1