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

using model chemistry: QCISD/6-31+G**

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/6-31+G**
 hartrees
Energy at 0K-266.447908
Energy at 298.15K-266.451982
HF Energy-265.651780
Nuclear repulsion energy159.189794
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/6-31+G**
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' 3234 3057 5.17      
2 A' 3112 2943 1.03      
3 A' 3064 2897 59.17      
4 A' 1812 1713 8.00      
5 A' 1786 1688 190.89      
6 A' 1511 1429 14.31      
7 A' 1448 1369 24.32      
8 A' 1391 1315 3.25      
9 A' 1296 1225 18.68      
10 A' 1044 987 2.60      
11 A' 807 763 10.65      
12 A' 582 550 12.21      
13 A' 490 463 26.83      
14 A' 251 237 16.58      
15 A" 3190 3016 4.17      
16 A" 1510 1427 9.22      
17 A" 1083 1024 1.70      
18 A" 923 873 0.03      
19 A" 466 440 0.97      
20 A" 116 110 14.60      
21 A" 88 83 12.52      

Unscaled Zero Point Vibrational Energy (zpe) 14600.8 cm-1
Scaled (by 0.9454) Zero Point Vibrational Energy (zpe) 13803.6 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 QCISD/6-31+G**
ABC
0.30169 0.14675 0.10055

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.844 -0.730 0.000
C2 0.000 0.549 0.000
C3 1.497 0.400 0.000
O4 -0.349 -1.844 0.000
O5 -0.597 1.618 0.000
H6 -1.932 -0.557 0.000
H7 1.958 1.385 0.000
H8 1.811 -0.168 0.877
H9 1.811 -0.168 -0.877

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53302.60001.21862.36111.10133.51062.85262.8526
C21.53301.50492.41871.22382.22602.12872.13662.1366
C32.60001.50492.90612.42263.56001.08711.09121.0912
O41.21862.41872.90613.47062.03973.96832.87202.8720
O52.36111.22382.42263.47062.55172.56543.12363.1236
H61.10132.22603.56002.03972.55174.34733.86413.8641
H73.51062.12871.08713.96832.56544.34731.78921.7892
H82.85262.13661.09122.87203.12363.86411.78921.7550
H92.85262.13661.09122.87203.12363.86411.78921.7550

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 117.708 C1 C2 O5 117.402
C2 C1 O4 122.638 C2 C1 H6 114.350
C2 C3 H7 109.363 C2 C3 H8 109.750
C2 C3 H9 109.750 C3 C2 O5 124.891
O4 C1 H6 123.012 H7 C3 H8 110.446
H7 C3 H9 110.446 H8 C3 H9 107.057
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability