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: MP2/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-264.662792
Energy at 298.15K-264.667012
HF Energy-264.136502
Nuclear repulsion energy157.603741
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 MP2/3-21G
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' 3203 3057 4.95      
2 A' 3101 2960 0.21      
3 A' 3013 2876 87.52      
4 A' 1642 1567 8.23      
5 A' 1590 1518 20.60      
6 A' 1552 1482 18.15      
7 A' 1475 1408 34.81      
8 A' 1382 1319 3.84      
9 A' 1228 1172 28.88      
10 A' 1023 977 1.67      
11 A' 767 732 13.87      
12 A' 576 550 7.34      
13 A' 467 446 17.13      
14 A' 254 242 18.32      
15 A" 3167 3023 2.63      
16 A" 1575 1503 12.03      
17 A" 1131 1080 4.28      
18 A" 975 930 0.01      
19 A" 509 486 0.02      
20 A" 198 189 13.50      
21 A" 89 85 2.35      

Unscaled Zero Point Vibrational Energy (zpe) 14458.7 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 13800.8 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 MP2/3-21G
ABC
0.29866 0.14444 0.09915

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.862 -0.698 0.000
C2 0.000 0.565 0.000
C3 1.495 0.310 0.000
O4 -0.369 -1.848 0.000
O5 -0.559 1.687 0.000
H6 -1.943 -0.486 0.000
H7 2.031 1.261 0.000
H8 1.770 -0.276 0.883
H9 1.770 -0.276 -0.883

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52912.56291.25132.40441.10173.49342.80782.8078
C21.52911.51642.44161.25382.20892.14672.14982.1498
C32.56291.51642.85182.47323.52841.09171.09511.0951
O41.25132.44162.85183.54082.08123.92792.79772.7977
O52.40441.25382.47323.54082.57632.62513.17233.1723
H61.10172.20893.52842.08122.57634.34073.82223.8222
H73.49342.14671.09173.92792.62514.34071.79201.7920
H82.80782.14981.09512.79773.17233.82221.79201.7657
H92.80782.14981.09512.79773.17233.82221.79201.7657

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 114.607 C1 C2 O5 119.208
C2 C1 O4 122.530 C2 C1 H6 113.206
C2 C3 H7 109.717 C2 C3 H8 109.761
C2 C3 H9 109.761 C3 C2 O5 126.185
O4 C1 H6 124.263 H7 C3 H8 110.062
H7 C3 H9 110.062 H8 C3 H9 107.447
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability