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Calculated Energies of Hydrogen Bonds

B3LYPultrafine/6-31+G**

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -266.226682 -189.767944 -76.434049 0.024690 64.8  kJ mol-1
Vibrational zero point energy (cm-1) 12494 7060 4498 -937 -11.2  kJ mol-1
Total         53.6  kJ mol-1