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-266.431429
Energy at 298.15K-266.435557
HF Energy-265.644141
Nuclear repulsion energy159.394322
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
(Å4/u)
Dep P Dep U
1 A' 3242 3052 6.07      
2 A' 3122 2939 0.93      
3 A' 3056 2877 73.04      
4 A' 1834 1727 9.73      
5 A' 1807 1701 146.39      
6 A' 1521 1431 11.61      
7 A' 1452 1367 23.66      
8 A' 1395 1313 3.88      
9 A' 1300 1224 21.72      
10 A' 1044 982 3.03      
11 A' 809 762 10.69      
12 A' 584 549 11.48      
13 A' 487 459 27.73      
14 A' 252 237 16.91      
15 A" 3200 3012 4.96      
16 A" 1525 1436 7.86      
17 A" 1092 1028 1.93      
18 A" 930 876 0.06      
19 A" 470 442 1.01      
20 A" 134 126 15.28      
21 A" 100 94 6.75      

Unscaled Zero Point Vibrational Energy (zpe) 14677.2 cm-1
Scaled (by 0.9414) Zero Point Vibrational Energy (zpe) 13817.1 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
0.30229 0.14732 0.10089

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 -0.848 -0.722 0.000
C2 0.000 0.552 0.000
C3 1.496 0.380 0.000
O4 -0.358 -1.836 0.000
O5 -0.583 1.625 0.000
H6 -1.934 -0.537 0.000
H7 1.974 1.355 0.000
H8 1.802 -0.192 0.877
H9 1.802 -0.192 -0.877

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53082.59001.21692.36241.10203.50422.84092.8409
C21.53081.50602.41541.22132.21982.13102.13742.1374
C32.59001.50602.88952.42393.55061.08651.09041.0904
O41.21692.41542.88953.46892.04263.95312.85292.8529
O52.36241.22132.42393.46892.54962.57133.12393.1239
H61.10202.21983.55062.04262.54964.34223.85293.8529
H73.50422.13101.08653.95312.57134.34221.78691.7869
H82.84092.13741.09042.85293.12393.85291.78691.7539
H92.84092.13741.09042.85293.12393.85291.78691.7539

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 117.053 C1 C2 O5 117.838
C2 C1 O4 122.643 C2 C1 H6 113.954
C2 C3 H7 109.504 C2 C3 H8 109.785
C2 C3 H9 109.785 C3 C2 O5 125.109
O4 C1 H6 123.403 H7 C3 H8 110.333
H7 C3 H9 110.333 H8 C3 H9 107.070
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability