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: QCISD/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 QCISD/6-31G
 hartrees
Energy at 0K-266.056961
Energy at 298.15K-266.061086
HF Energy-265.503541
Nuclear repulsion energy157.068695
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 QCISD/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' 3136 3022 6.76      
2 A' 3028 2918 1.26      
3 A' 3012 2902 58.43      
4 A' 1682 1621 10.97      
5 A' 1644 1585 84.37      
6 A' 1523 1467 18.63      
7 A' 1461 1408 24.54      
8 A' 1366 1316 3.85      
9 A' 1279 1232 22.46      
10 A' 1046 1008 2.04      
11 A' 790 762 11.08      
12 A' 582 560 10.91      
13 A' 487 469 26.16      
14 A' 255 246 18.50      
15 A" 3096 2983 6.47      
16 A" 1522 1466 11.43      
17 A" 1087 1048 3.34      
18 A" 915 881 0.29      
19 A" 467 450 0.45      
20 A" 138 133 20.13      
21 A" 103 100 5.53      

Unscaled Zero Point Vibrational Energy (zpe) 14308.5 cm-1
Scaled (by 0.9636) Zero Point Vibrational Energy (zpe) 13787.7 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 QCISD/6-31G
ABC
0.29499 0.14335 0.09826

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.857 -0.723 0.000
C2 0.000 0.543 0.000
C3 1.510 0.392 0.000
O4 -0.353 -1.869 0.000
O5 -0.598 1.649 0.000
H6 -1.950 -0.552 0.000
H7 1.971 1.389 0.000
H8 1.839 -0.173 0.888
H9 1.839 -0.173 -0.888

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52922.61611.25172.38581.10583.52932.89102.8910
C21.52921.51722.43811.25682.23622.14442.16382.1638
C32.61611.51722.92932.45433.58561.09841.10231.1023
O41.25172.43812.92933.52612.06944.00162.91012.9101
O52.38581.25682.45433.52612.58232.58243.16963.1696
H61.10582.23623.58562.06942.58234.37443.90933.9093
H73.52932.14441.09844.00162.58244.37441.80111.8011
H82.89102.16381.10232.91013.16963.90931.80111.7753
H92.89102.16381.10232.91013.16963.90931.80111.7753

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 118.348 C1 C2 O5 117.479
C2 C1 O4 122.180 C2 C1 H6 115.184
C2 C3 H7 109.089 C2 C3 H8 110.383
C2 C3 H9 110.383 C3 C2 O5 124.173
O4 C1 H6 122.636 H7 C3 H8 109.852
H7 C3 H9 109.852 H8 C3 H9 107.267
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability