return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for H2OH2CO (water formaldehyde dimer)

using model chemistry: PBEPBE_cp_opt/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C1 1A
Energy calculated at PBEPBE_cp_opt/6-31G*
 hartrees
Energy at 0K-190.697173
Energy at 298.15K-190.700031
Nuclear repulsion energy 
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at PBEPBE_cp_opt/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A 3720 3667 45.65      
2 A 3533 3482 186.73      
3 A 2920 2878 110.67      
4 A 2856 2815 65.58      
5 A 1776 1751 78.43      
6 A 1709 1684 74.01      
7 A 1509 1487 10.73      
8 A 1243 1226 6.46      
9 A 1159 1143 3.60      
10 A 533 525 152.23      
11 A 354 349 109.37      
12 A 188 186 24.61      
13 A 178 176 4.21      
14 A 85 84 107.19      
15 A 77 76 57.74      

Unscaled Zero Point Vibrational Energy (zpe) 10920.0 cm-1
Scaled (by 0.9857) Zero Point Vibrational Energy (zpe) 10763.8 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at PBEPBE_cp_opt/6-31G*
ABC
1.28679 0.15943 0.14245

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE_cp_opt/6-31G*

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.056 -0.375 -0.052
O2 1.873 0.174 -0.060
O3 -0.920 -0.681 -0.013
H4 2.511 -0.373 0.435
C5 -1.346 0.462 0.021
H6 -0.666 1.347 0.071
H7 -2.443 0.682 0.004

Atom - Atom Distances (Å)
  H1 O2 O3 H4 C5 H6 H7
H10.98422.00001.53402.54472.43803.6553
O20.98422.92130.97573.23282.79954.3459
O32.00002.92133.47341.22022.04562.0436
H41.53400.97573.47343.96783.63075.0829
C52.54473.23281.22023.96781.11751.1187
H62.43802.79952.04563.63071.11751.8987
H73.65534.34592.04365.08291.11871.8987

picture of water formaldehyde dimer state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 O2 H4 103.012 H1 O3 C5 101.660
O2 H1 O3 154.896 O3 C5 H6 122.042
O3 C5 H7 121.732 H6 C5 H7 116.226
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability