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Calculated Energies of Hydrogen Bonds

PBEPBEultrafine_cp_opt/6-31G*

Dimer H Donor H Acceptor comment
HCOOHH2O Formic acid water dimer HCOOH Formic acid H2O Water

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -265.897535 -189.554521 -76.322481 0.020533 53.9  kJ mol-1
Vibrational zero point energy (cm-1) 12556 7009 4455 -1092 -13.1  kJ mol-1
Total         40.8  kJ mol-1