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Calculated Energies of Hydrogen Bonds

PBEPBE_cp/3-21G

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) -264.386813 -75.886477 -188.488045 0.012290 32.3  kJ mol-1
Vibrational zero point energy (cm-1) 11951 4169 6819 -963 -11.5  kJ mol-1
Total         20.7  kJ mol-1