return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for HOCH (hydroxycarbene)

using model chemistry: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS trans 1A'
1 2 no CS cis 1A'

Conformer 1 (CS trans)

Jump to S1C2
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-114.156968
Energy at 298.15K-114.158391
HF Energy-113.800107
Nuclear repulsion energy30.742037
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 MP2/6-31G(2df,p)
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' 3778 3568 89.64      
2 A' 2951 2787 123.08      
3 A' 1539 1453 15.46      
4 A' 1373 1296 58.95      
5 A' 1227 1159 135.83      
6 A" 1137 1074 111.82      

Unscaled Zero Point Vibrational Energy (zpe) 6001.5 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 5668.4 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 MP2/6-31G(2df,p)
ABC
9.54528 1.22286 1.08399

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.010 0.742 0.000
O2 0.010 -0.571 0.000
H3 -1.081 0.966 0.000
H4 0.935 -0.852 0.000

Atom - Atom Distances (Å)
  C1 O2 H3 H4
C11.31281.11381.8432
O21.31281.88480.9666
H31.11381.88482.7149
H41.84320.96662.7149

picture of hydroxycarbene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 O2 H4 106.945 O2 C1 H3 101.613
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (CS cis)

Jump to S1C1
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-114.149412
Energy at 298.15K-114.150827
HF Energy-113.792780
Nuclear repulsion energy30.696989
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 MP2/6-31G(2df,p)
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' 3679 3475 21.74      
2 A' 2875 2715 172.62      
3 A' 1511 1427 40.60      
4 A' 1382 1305 68.38      
5 A' 1255 1186 41.72      
6 A" 1061 1002 32.67      

Unscaled Zero Point Vibrational Energy (zpe) 5880.9 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 5554.5 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 MP2/6-31G(2df,p)
ABC
9.30948 1.21999 1.07864

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.122 0.741 0.000
O2 0.122 -0.567 0.000
H3 -0.950 1.060 0.000
H4 -0.762 -0.968 0.000

Atom - Atom Distances (Å)
  C1 O2 H3 H4
C11.30821.11881.9240
O21.30821.94870.9708
H31.11881.94872.0362
H41.92400.97082.0362

picture of hydroxycarbene state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 O2 H4 114.360 O2 C1 H3 106.558
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability