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Calculated Energies of Hydrogen Bonds

PBEPBEultrafine_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) -265.880529 -76.322481 -189.554521 0.003526 9.3  kJ mol-1
Vibrational zero point energy (cm-1) 12110 4455 7009 -646 -7.7  kJ mol-1
Total         1.5  kJ mol-1