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: CCD/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 CCD/3-21G
 hartrees
Energy at 0K-264.675142
Energy at 298.15K-264.679397
HF Energy-264.139488
Nuclear repulsion energy158.161612
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 CCD/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' 3152 3065 6.19      
2 A' 3059 2974 0.75      
3 A' 3000 2917 71.26      
4 A' 1739 1691 15.34      
5 A' 1695 1648 25.39      
6 A' 1545 1502 12.97      
7 A' 1468 1427 30.57      
8 A' 1386 1348 5.37      
9 A' 1230 1196 27.66      
10 A' 1031 1003 1.91      
11 A' 770 748 12.11      
12 A' 587 571 7.62      
13 A' 474 461 19.98      
14 A' 257 250 17.80      
15 A" 3118 3031 4.65      
16 A" 1558 1515 11.36      
17 A" 1123 1092 4.28      
18 A" 966 939 0.03      
19 A" 506 492 0.00      
20 A" 197 191 15.02      
21 A" 100 98 2.17      

Unscaled Zero Point Vibrational Energy (zpe) 14481.1 cm-1
Scaled (by 0.9723) Zero Point Vibrational Energy (zpe) 14080.0 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 CCD/3-21G
ABC
0.29889 0.14581 0.09984

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.866 -0.696 0.000
C2 0.000 0.563 0.000
C3 1.498 0.309 0.000
O4 -0.380 -1.836 0.000
O5 -0.549 1.676 0.000
H6 -1.949 -0.487 0.000
H7 2.035 1.264 0.000
H8 1.777 -0.277 0.886
H9 1.777 -0.277 -0.886

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52892.56951.23872.39321.10273.50112.81932.8193
C21.52891.51982.42891.24042.21442.15182.15632.1563
C32.56951.51982.85072.46163.53831.09501.09841.0984
O41.23872.42892.85073.51542.06873.92882.80472.8047
O52.39321.24042.46163.51542.57692.61643.16383.1638
H61.10272.21443.53832.06872.57694.35173.83593.8359
H73.50112.15181.09503.92882.61644.35171.79601.7960
H82.81932.15631.09842.80473.16383.83591.79601.7722
H92.81932.15631.09842.80473.16383.83591.79601.7722

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 114.877 C1 C2 O5 119.216
C2 C1 O4 122.360 C2 C1 H6 113.601
C2 C3 H7 109.690 C2 C3 H8 109.848
C2 C3 H9 109.848 C3 C2 O5 125.907
O4 C1 H6 124.039 H7 C3 H8 109.932
H7 C3 H9 109.932 H8 C3 H9 107.563
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability