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Calculated Energies of Hydrogen Bonds

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

Dimer H Donor H Acceptor comment
HCOOHH2O Formic acid water dimer HCOOH Formic acid H2O Water

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -266.224507 -189.768383 -76.426078 0.030047 78.9  kJ mol-1
Vibrational zero point energy (cm-1) 12674 7105 4528 -1041 -12.5  kJ mol-1
Total         66.4  kJ mol-1