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

using model chemistry: PBE1PBE/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 PBE1PBE/3-21G*
 hartrees
Energy at 0K-265.366252
Energy at 298.15K 
HF Energy-265.366252
Nuclear repulsion energy159.507016
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 PBE1PBE/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' 3202 3074 2.78      
2 A' 3082 2958 0.36      
3 A' 2999 2878 82.19      
4 A' 1782 1710 37.98      
5 A' 1759 1688 69.05      
6 A' 1507 1446 18.50      
7 A' 1443 1385 59.58      
8 A' 1374 1318 2.52      
9 A' 1235 1185 30.70      
10 A' 1025 984 3.64      
11 A' 793 762 14.50      
12 A' 587 563 7.80      
13 A' 472 453 19.53      
14 A' 260 250 20.84      
15 A" 3144 3017 0.37      
16 A" 1526 1465 17.54      
17 A" 1129 1083 8.16      
18 A" 961 923 0.72      
19 A" 516 495 0.26      
20 A" 199 191 15.04      
21 A" 35i 34i 3.43      

Unscaled Zero Point Vibrational Energy (zpe) 14479.2 cm-1
Scaled (by 0.9598) Zero Point Vibrational Energy (zpe) 13897.1 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 PBE1PBE/3-21G*
ABC
0.30463 0.14831 0.10162

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.846 -0.698 0.000
C2 0.000 0.566 0.000
C3 1.477 0.314 0.000
O4 -0.358 -1.823 0.000
O5 -0.565 1.660 0.000
H6 -1.927 -0.479 0.000
H7 2.028 1.256 0.000
H8 1.748 -0.283 0.879
H9 1.748 -0.283 -0.879

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52102.53351.22632.37451.10363.47492.77002.7700
C21.52101.49822.41641.23072.19292.14192.13312.1331
C32.53351.49822.81752.44503.49561.09101.09681.0968
O41.22632.41642.81753.48932.06583.89582.75372.7537
O52.37451.23072.44503.48932.53662.62363.14593.1459
H61.10362.19293.49562.06582.53664.31933.78443.7844
H73.47492.14191.09103.89582.62364.31931.79431.7943
H82.77002.13311.09682.75373.14593.78441.79431.7578
H92.77002.13311.09682.75373.14593.78441.79431.7578

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 114.096 C1 C2 O5 118.918
C2 C1 O4 122.815 C2 C1 H6 112.358
C2 C3 H7 110.649 C2 C3 H8 109.602
C2 C3 H9 109.602 C3 C2 O5 126.986
O4 C1 H6 124.827 H7 C3 H8 110.195
H7 C3 H9 110.195 H8 C3 H9 106.509
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.203      
2 C 0.331      
3 C -0.705      
4 O -0.408      
5 O -0.427      
6 H 0.222      
7 H 0.257      
8 H 0.264      
9 H 0.264      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.840 -0.121 0.000 0.848
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.044 1.775 0.000
y 1.775 -37.483 0.000
z 0.000 0.000 -27.395
Traceless
 xyz
x 6.395 1.775 0.000
y 1.775 -10.764 0.000
z 0.000 0.000 4.369
Polar
3z2-r28.737
x2-y211.439
xy1.775
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.137 -0.495 0.000
y -0.495 5.804 0.000
z 0.000 0.000 2.788


<r2> (average value of r2) Å2
<r2> 111.415
(<r2>)1/2 10.555