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

using model chemistry: CISD/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 CISD/6-31G*
 hartrees
Energy at 0K-266.276168
Energy at 298.15K-266.280410
HF Energy-265.640293
Nuclear repulsion energy160.604786
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/6-31G*
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' 3293 3048 4.52      
2 A' 3177 2941 0.28      
3 A' 3138 2905 61.92      
4 A' 1945 1801 7.03      
5 A' 1921 1778 203.99      
6 A' 1556 1441 14.24      
7 A' 1500 1389 32.15      
8 A' 1437 1330 4.88      
9 A' 1345 1246 22.16      
10 A' 1079 999 4.88      
11 A' 838 776 10.52      
12 A' 608 562 12.79      
13 A' 508 470 32.02      
14 A' 262 243 18.87      
15 A" 3249 3008 3.18      
16 A" 1559 1443 10.40      
17 A" 1140 1055 3.07      
18 A" 969 897 0.32      
19 A" 493 457 1.16      
20 A" 140 130 17.09      
21 A" 108 100 9.28      

Unscaled Zero Point Vibrational Energy (zpe) 15132.4 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 14009.6 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/6-31G*
ABC
0.30554 0.14979 0.10240

See section I.F.4 to change rotational constant units
Geometric Data calculated at CISD/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.843 -0.721 0.000
C2 0.000 0.548 0.000
C3 1.490 0.384 0.000
O4 -0.358 -1.820 0.000
O5 -0.581 1.605 0.000
H6 -1.927 -0.541 0.000
H7 1.963 1.360 0.000
H8 1.800 -0.185 0.875
H9 1.800 -0.185 -0.875

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52362.58101.20142.34081.09823.49322.83552.8355
C21.52361.49882.39531.20632.21322.12402.13192.1319
C32.58101.49882.87592.40453.53911.08491.08881.0888
O41.20142.39532.87593.43262.02373.93692.84552.8455
O52.34081.20632.40453.43262.53312.55593.10553.1055
H61.09822.21323.53912.02372.53314.32903.84473.8447
H73.49322.12401.08493.93692.55594.32901.78311.7831
H82.83552.13191.08882.84553.10553.84471.78311.7495
H92.83552.13191.08882.84553.10553.84471.78311.7495

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 117.282 C1 C2 O5 117.598
C2 C1 O4 122.602 C2 C1 H6 114.175
C2 C3 H7 109.541 C2 C3 H8 109.945
C2 C3 H9 109.945 C3 C2 O5 125.120
O4 C1 H6 123.222 H7 C3 H8 110.230
H7 C3 H9 110.230 H8 C3 H9 106.917
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability