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 C3H4O2 (Methyl glyoxal)

using model chemistry: MP2/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31G*
 hartrees
Energy at 0K-266.369265
Energy at 298.15K-266.373401
HF Energy-265.635477
Nuclear repulsion energy159.210515
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*
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' 3243 3058 2.79      
2 A' 3118 2940 0.05      
3 A' 3043 2870 69.88      
4 A' 1764 1664 22.79      
5 A' 1751 1652 76.94      
6 A' 1522 1435 15.25      
7 A' 1450 1368 35.31      
8 A' 1386 1307 2.24      
9 A' 1303 1229 19.32      
10 A' 1041 982 3.88      
11 A' 816 769 11.28      
12 A' 583 549 10.48      
13 A' 486 458 25.32      
14 A' 254 240 17.27      
15 A" 3200 3018 1.36      
16 A" 1526 1439 10.91      
17 A" 1091 1029 3.33      
18 A" 929 876 0.11      
19 A" 470 443 0.29      
20 A" 140 132 14.86      
21 A" 107 101 5.99      

Unscaled Zero Point Vibrational Energy (zpe) 14610.2 cm-1
Scaled (by 0.943) Zero Point Vibrational Energy (zpe) 13777.4 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*
ABC
0.30240 0.14721 0.10085

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.845 -0.724 0.000
C2 0.000 0.558 0.000
C3 1.495 0.373 0.000
O4 -0.366 -1.843 0.000
O5 -0.577 1.635 0.000
H6 -1.936 -0.524 0.000
H7 1.977 1.351 0.000
H8 1.802 -0.201 0.879
H9 1.802 -0.201 -0.879

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53542.58461.21752.37451.10943.50322.83812.8381
C21.53541.50622.42851.22232.21792.13042.14382.1438
C32.58461.50622.89362.42603.54651.09021.09401.0940
O41.21752.42852.89363.48472.05143.96112.85792.8579
O52.37451.22232.42603.48472.55112.57023.13123.1312
H61.10942.21793.54652.05142.55114.33953.85393.8539
H73.50322.13041.09023.96112.57024.33951.79211.7921
H82.83812.14381.09402.85793.13123.85391.79211.7581
H92.83812.14381.09402.85793.13123.85391.79211.7581

picture of Methyl glyoxal state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 116.365 C1 C2 O5 118.423
C2 C1 O4 123.393 C2 C1 H6 112.993
C2 C3 H7 109.229 C2 C3 H8 110.061
C2 C3 H9 110.061 C3 C2 O5 125.212
O4 C1 H6 123.614 H7 C3 H8 110.269
H7 C3 H9 110.269 H8 C3 H9 106.932
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability