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All results from a given calculation for C3H4O2 (Methyl glyoxal)

using model chemistry: CISD/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 CISD/3-21G*
 hartrees
Energy at 0K-264.605914
Energy at 298.15K-264.610225
HF Energy-264.142350
Nuclear repulsion energy159.233597
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 CISD/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' 3237 3024 4.76      
2 A' 3140 2934 0.18      
3 A' 3091 2888 68.66      
4 A' 1820 1700 22.62      
5 A' 1780 1663 69.08      
6 A' 1576 1473 15.82      
7 A' 1508 1409 34.63      
8 A' 1421 1328 6.14      
9 A' 1264 1181 29.82      
10 A' 1061 991 1.88      
11 A' 790 738 12.77      
12 A' 601 562 9.24      
13 A' 487 455 23.04      
14 A' 265 247 20.11      
15 A" 3198 2989 2.92      
16 A" 1591 1487 12.96      
17 A" 1162 1086 4.97      
18 A" 999 933 0.04      
19 A" 523 489 0.04      
20 A" 197 184 18.34      
21 A" 95 89 2.62      

Unscaled Zero Point Vibrational Energy (zpe) 14902.7 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 13925.1 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 CISD/3-21G*
ABC
0.30203 0.14784 0.10112

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.859 -0.698 0.000
C2 0.000 0.562 0.000
C3 1.490 0.316 0.000
O4 -0.373 -1.824 0.000
O5 -0.554 1.659 0.000
H6 -1.934 -0.491 0.000
H7 2.022 1.265 0.000
H8 1.769 -0.267 0.880
H9 1.769 -0.267 -0.880

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52442.55821.22642.37641.09533.48542.80412.8041
C21.52441.51062.41481.22922.20202.14042.14282.1428
C32.55821.51062.83722.44653.51811.08801.09161.0916
O41.22642.41482.83723.48772.05283.90852.79012.7901
O52.37641.22922.44653.48772.55472.60583.14373.1437
H61.09532.20203.51812.05282.55474.32793.81273.8127
H73.48542.14041.08803.90852.60584.32791.78511.7851
H82.80412.14281.09162.79013.14373.81271.78511.7596
H92.80412.14281.09162.79013.14373.81271.78511.7596

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 114.893 C1 C2 O5 118.927
C2 C1 O4 122.400 C2 C1 H6 113.386
C2 C3 H7 109.843 C2 C3 H8 109.811
C2 C3 H9 109.811 C3 C2 O5 126.180
O4 C1 H6 124.215 H7 C3 H8 109.971
H7 C3 H9 109.971 H8 C3 H9 107.400
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability