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Calculated Energies of Hydrogen Bonds

B3LYPultrafine_cp/6-31+G**

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) -266.215773 -76.434049 -189.767944 0.013780 36.2  kJ mol-1
Vibrational zero point energy (cm-1) 12201 4498 7060 -644 -7.7  kJ mol-1
Total         28.5  kJ mol-1