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

using model chemistry: PBEPBE/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 PBEPBE/3-21G
 hartrees
Energy at 0K-265.364152
Energy at 298.15K 
HF Energy-265.364152
Nuclear repulsion energy157.878833
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 PBEPBE/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' 3117 3089 4.24      
2 A' 2996 2968 0.25      
3 A' 2850 2824 114.71      
4 A' 1683 1667 42.92      
5 A' 1665 1650 47.67      
6 A' 1462 1448 17.63      
7 A' 1387 1374 56.49      
8 A' 1326 1314 1.45      
9 A' 1175 1164 31.70      
10 A' 978 969 2.50      
11 A' 756 749 16.28      
12 A' 557 552 6.85      
13 A' 450 446 15.54      
14 A' 248 246 18.79      
15 A" 3052 3024 0.85      
16 A" 1480 1467 16.05      
17 A" 1082 1072 6.99      
18 A" 917 909 0.61      
19 A" 493 488 0.58      
20 A" 190 189 10.60      
21 A" 79i 79i 3.50      

Unscaled Zero Point Vibrational Energy (zpe) 13892.3 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 13765.9 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 PBEPBE/3-21G
ABC
0.29954 0.14486 0.09946

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.848 -0.707 0.000
C2 0.000 0.575 0.000
C3 1.489 0.319 0.000
O4 -0.359 -1.847 0.000
O5 -0.574 1.679 0.000
H6 -1.941 -0.475 0.000
H7 2.047 1.265 0.000
H8 1.758 -0.287 0.884
H9 1.758 -0.287 -0.884

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53732.55221.23992.40241.11733.50352.78402.7840
C21.53731.51052.44811.24482.20652.16072.14842.1484
C32.55221.51052.84712.47103.52031.09881.10541.1054
O41.23992.44812.84713.53272.09393.93402.77462.7746
O52.40241.24482.47103.53272.55112.65403.17613.1761
H61.11732.20653.52032.09392.55114.35133.80793.8079
H73.50352.16071.09883.93402.65404.35131.80971.8097
H82.78402.14841.10542.77463.17613.80791.80971.7688
H92.78402.14841.10542.77463.17613.80791.80971.7688

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 113.731 C1 C2 O5 119.057
C2 C1 O4 123.300 C2 C1 H6 111.464
C2 C3 H7 110.811 C2 C3 H8 109.450
C2 C3 H9 109.450 C3 C2 O5 127.212
O4 C1 H6 125.236 H7 C3 H8 110.374
H7 C3 H9 110.374 H8 C3 H9 106.274
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.182      
2 C 0.309      
3 C -0.668      
4 O -0.370      
5 O -0.387      
6 H 0.195      
7 H 0.240      
8 H 0.250      
9 H 0.250      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.906 -0.112 0.000 0.913
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.340 1.598 0.000
y 1.598 -36.774 0.000
z 0.000 0.000 -27.431
Traceless
 xyz
x 5.762 1.598 0.000
y 1.598 -9.889 0.000
z 0.000 0.000 4.127
Polar
3z2-r28.253
x2-y210.434
xy1.598
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.525 -0.413 0.000
y -0.413 6.018 0.000
z 0.000 0.000 2.850


<r2> (average value of r2) Å2
<r2> 113.271
(<r2>)1/2 10.643