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

using model chemistry: QCISD(T)/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 QCISD(T)/6-31G*
 hartrees
Energy at 0K-266.423522
Energy at 298.15K-266.427627
HF Energy-265.635658
Nuclear repulsion energy158.945884
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(T)/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' 3182 3052        
2 A' 3067 2942        
3 A' 2993 2871        
4 A' 1787 1714        
5 A' 1767 1695        
6 A' 1507 1446        
7 A' 1437 1378        
8 A' 1373 1317        
9 A' 1289 1236        
10 A' 1033 991        
11 A' 802 770        
12 A' 578 555        
13 A' 483 463        
14 A' 250 240        
15 A" 3138 3010        
16 A" 1506 1445        
17 A" 1076 1032        
18 A" 915 877        
19 A" 462 443        
20 A" 135 130        
21 A" 111 106        

Unscaled Zero Point Vibrational Energy (zpe) 14443.7 cm-1
Scaled (by 0.9593) Zero Point Vibrational Energy (zpe) 13855.9 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(T)/6-31G*
ABC
0.30066 0.14680 0.10048

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.849 -0.722 0.000
C2 0.000 0.551 0.000
C3 1.498 0.381 0.000
O4 -0.357 -1.841 0.000
O5 -0.586 1.629 0.000
H6 -1.944 -0.540 0.000
H7 1.977 1.364 0.000
H8 1.809 -0.194 0.882
H9 1.809 -0.194 -0.882

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52972.59341.22252.36481.10963.51242.85012.8501
C21.52971.50802.41791.22682.22882.13762.14622.1462
C32.59341.50802.89422.42943.56301.09401.09801.0980
O41.22252.41792.89423.47672.05193.96472.86042.8604
O52.36481.22682.42943.47672.55822.57623.13653.1365
H61.10962.22883.56302.05192.55824.35843.87073.8707
H73.51242.13761.09403.96472.57624.35841.79901.7990
H82.85012.14621.09802.86043.13653.87071.79901.7648
H92.85012.14621.09802.86043.13653.87071.79901.7648

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 117.239 C1 C2 O5 117.745
C2 C1 O4 122.543 C2 C1 H6 114.284
C2 C3 H7 109.444 C2 C3 H8 109.896
C2 C3 H9 109.896 C3 C2 O5 125.016
O4 C1 H6 123.173 H7 C3 H8 110.309
H7 C3 H9 110.309 H8 C3 H9 106.959
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability