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

using model chemistry: B3PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3PW91/3-21G*
 hartrees
Energy at 0K-265.564761
Energy at 298.15K 
HF Energy-265.564761
Nuclear repulsion energy159.155372
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 B3PW91/3-21G*
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' 3188 3058 3.55      
2 A' 3071 2946 0.21      
3 A' 2976 2855 90.04      
4 A' 1759 1688 37.46      
5 A' 1739 1669 67.36      
6 A' 1505 1444 18.16      
7 A' 1439 1380 56.98      
8 A' 1371 1316 2.42      
9 A' 1222 1172 31.71      
10 A' 1019 978 3.00      
11 A' 782 750 15.26      
12 A' 581 557 8.11      
13 A' 470 451 18.90      
14 A' 257 247 20.20      
15 A" 3129 3002 0.72      
16 A" 1524 1462 16.85      
17 A" 1123 1078 7.92      
18 A" 957 918 0.65      
19 A" 512 492 0.27      
20 A" 196 188 14.68      
21 A" 38i 37i 3.27      

Unscaled Zero Point Vibrational Energy (zpe) 14391.0 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 13806.8 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 B3PW91/3-21G*
ABC
0.30330 0.14741 0.10105

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.845 -0.702 0.000
C2 0.000 0.567 0.000
C3 1.481 0.322 0.000
O4 -0.359 -1.831 0.000
O5 -0.569 1.661 0.000
H6 -1.927 -0.482 0.000
H7 2.027 1.267 0.000
H8 1.757 -0.273 0.879
H9 1.757 -0.273 -0.879

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52512.54191.22822.37911.10463.48262.77942.7794
C21.52511.50142.42461.23282.19472.14462.13662.1366
C32.54191.50142.83252.44893.50241.09131.09711.0971
O41.22822.42462.83253.49762.06783.91062.77052.7705
O52.37911.23282.44893.49762.53712.62623.15013.1501
H61.10462.19473.50242.06782.53714.32433.79323.7932
H73.48262.14461.09133.91062.62624.32431.79431.7943
H82.77942.13661.09712.77053.15013.79321.79431.7587
H92.77942.13661.09712.77053.15013.79321.79431.7587

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 114.252 C1 C2 O5 118.848
C2 C1 O4 123.075 C2 C1 H6 112.154
C2 C3 H7 110.619 C2 C3 H8 109.637
C2 C3 H9 109.637 C3 C2 O5 126.900
O4 C1 H6 124.771 H7 C3 H8 110.156
H7 C3 H9 110.156 H8 C3 H9 106.550
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.200      
2 C 0.331      
3 C -0.693      
4 O -0.403      
5 O -0.422      
6 H 0.217      
7 H 0.252      
8 H 0.259      
9 H 0.259      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.863 -0.108 0.000 0.870
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.010 1.784 0.000
y 1.784 -37.381 0.000
z 0.000 0.000 -27.327
Traceless
 xyz
x 6.345 1.784 0.000
y 1.784 -10.713 0.000
z 0.000 0.000 4.368
Polar
3z2-r28.736
x2-y211.372
xy1.784
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.195 -0.476 0.000
y -0.476 5.832 0.000
z 0.000 0.000 2.797


<r2> (average value of r2) Å2
<r2> 111.878
(<r2>)1/2 10.577