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Calculated Energies of Hydrogen Bonds

B3LYPultrafine/6-31+G**

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) -266.214792 -76.434049 -189.767944 0.012799 33.6  kJ mol-1
Vibrational zero point energy (cm-1) 12077 4498 7060 -520 -6.2  kJ mol-1
Total         27.4  kJ mol-1