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

using model chemistry: HF/CEP-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 HF/CEP-31G
 hartrees
Energy at 0K-50.033925
Energy at 298.15K-50.038236
HF Energy-50.033925
Nuclear repulsion energy85.432407
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 HF/CEP-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' 3360 3029 20.51      
2 A' 3308 2982 50.01      
3 A' 3240 2920 6.96      
4 A' 1908 1719 10.15      
5 A' 1856 1673 257.16      
6 A' 1603 1445 24.20      
7 A' 1566 1412 23.13      
8 A' 1467 1322 7.85      
9 A' 1395 1257 24.99      
10 A' 1134 1022 5.17      
11 A' 856 771 8.34      
12 A' 628 566 14.77      
13 A' 518 467 42.84      
14 A' 264 238 23.66      
15 A" 3322 2995 24.62      
16 A" 1607 1448 17.75      
17 A" 1193 1076 5.23      
18 A" 1013 913 0.45      
19 A" 520 469 1.03      
20 A" 145 131 34.66      
21 A" 95 86 10.34      

Unscaled Zero Point Vibrational Energy (zpe) 15498.4 cm-1
Scaled (by 0.9014) Zero Point Vibrational Energy (zpe) 13970.3 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 HF/CEP-31G
ABC
0.29848 0.14608 0.09987

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.851 -0.731 0.000
C2 0.000 0.545 0.000
C3 1.508 0.408 0.000
O4 -0.354 -1.849 0.000
O5 -0.601 1.618 0.000
H6 -1.928 -0.568 0.000
H7 1.961 1.393 0.000
H8 1.833 -0.151 0.875
H9 1.833 -0.151 -0.875

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53382.61981.22322.36201.08853.52402.88262.8826
C21.53381.51442.41951.22972.22562.13632.14742.1474
C32.61981.51442.92572.43153.57151.08431.08801.0880
O41.22322.41952.92573.47512.02863.98342.90402.9040
O52.36201.22972.43153.47512.55672.57143.13373.1337
H61.08852.22563.57152.02862.55674.35473.88383.8838
H73.52402.13631.08433.98342.57144.35471.77941.7794
H82.88262.14741.08802.90403.13373.88381.77941.7502
H92.88262.14741.08802.90403.13373.88381.77941.7502

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 118.518 C1 C2 O5 117.036
C2 C1 O4 122.311 C2 C1 H6 115.095
C2 C3 H7 109.475 C2 C3 H8 110.131
C2 C3 H9 110.131 C3 C2 O5 124.446
O4 C1 H6 122.594 H7 C3 H8 109.995
H7 C3 H9 109.995 H8 C3 H9 107.087
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.032      
2 C 0.028      
3 C -0.289      
4 O -0.172      
5 O -0.166      
6 H 0.187      
7 H 0.167      
8 H 0.138      
9 H 0.138      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.915 0.002 0.000 0.915
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.650 3.237 0.000
y 3.237 -42.355 0.000
z 0.000 0.000 -27.656
Traceless
 xyz
x 9.355 3.237 0.000
y 3.237 -15.702 0.000
z 0.000 0.000 6.347
Polar
3z2-r212.694
x2-y216.705
xy3.237
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.873 -0.907 0.000
y -0.907 6.411 0.000
z 0.000 0.000 3.087


<r2> (average value of r2) Å2
<r2> 93.150
(<r2>)1/2 9.651