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/3-21G

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/3-21G
 hartrees
Energy at 0K-264.686280
Energy at 298.15K-264.690473
HF Energy-264.138086
Nuclear repulsion energy157.691400
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/3-21G
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' 3142 3045 6.22      
2 A' 3047 2953 0.75      
3 A' 2970 2879 80.64      
4 A' 1705 1653 17.00      
5 A' 1658 1607 47.58      
6 A' 1538 1490 15.30      
7 A' 1461 1416 30.17      
8 A' 1372 1329 4.81      
9 A' 1215 1177 28.41      
10 A' 1019 988 1.11      
11 A' 756 733 12.92      
12 A' 574 557 7.97      
13 A' 466 451 18.92      
14 A' 253 245 18.19      
15 A" 3106 3010 4.40      
16 A" 1553 1506 11.34      
17 A" 1115 1081 4.04      
18 A" 958 929 0.00      
19 A" 501 485 0.01      
20 A" 191 185 15.04      
21 A" 91 88 2.27      

Unscaled Zero Point Vibrational Energy (zpe) 14345.7 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 13903.9 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/3-21G
ABC
0.29748 0.14482 0.09922

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.867 -0.701 0.000
C2 0.000 0.568 0.000
C3 1.500 0.310 0.000
O4 -0.376 -1.842 0.000
O5 -0.554 1.682 0.000
H6 -1.951 -0.488 0.000
H7 2.040 1.263 0.000
H8 1.776 -0.278 0.886
H9 1.776 -0.278 -0.886

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53642.57391.24312.40351.10473.50792.81972.8197
C21.53641.52242.43941.24502.21872.15492.15792.1579
C32.57391.52242.85522.47113.54261.09551.09891.0989
O41.24312.43942.85523.52952.07733.93442.80422.8042
O52.40351.24502.47113.52952.58142.62763.17223.1722
H61.10472.21873.54262.07732.58144.35823.83713.8371
H73.50792.15491.09553.93442.62764.35821.79771.7977
H82.81972.15791.09892.80423.17223.83711.79771.7728
H92.81972.15791.09892.80423.17223.83711.79771.7728

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 114.598 C1 C2 O5 119.200
C2 C1 O4 122.368 C2 C1 H6 113.283
C2 C3 H7 109.730 C2 C3 H8 109.763
C2 C3 H9 109.763 C3 C2 O5 126.203
O4 C1 H6 124.349 H7 C3 H8 110.012
H7 C3 H9 110.012 H8 C3 H9 107.530
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability