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Calculated Energies of Hydrogen Bonds

B3LYPultrafine_cp/6-31G*

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) -266.167885 -76.408954 -189.747171 0.011760 30.9  kJ mol-1
Vibrational zero point energy (cm-1) 12141 4452 7051 -638 -7.6  kJ mol-1
Total         23.2  kJ mol-1