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Calculated Energies of Hydrogen Bonds

PBEPBEultrafine_cp_opt/6-31G*

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) -265.884615 -76.322481 -189.554521 0.007613 20.0  kJ mol-1
Vibrational zero point energy (cm-1) 12293 4455 7009 -829 -9.9  kJ mol-1
Total         10.1  kJ mol-1