return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: B3PW91/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3PW91/6-31G**
 hartrees
Energy at 0K-267.048096
Energy at 298.15K-267.052087
HF Energy-267.048096
Nuclear repulsion energy159.730424
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 B3PW91/6-31G**
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' 3193 3060 3.84      
2 A' 3067 2940 0.01      
3 A' 2959 2836 87.85      
4 A' 1839 1762 76.64      
5 A' 1829 1753 119.80      
6 A' 1460 1400 14.46      
7 A' 1396 1338 43.94      
8 A' 1361 1304 2.28      
9 A' 1256 1204 22.51      
10 A' 1009 967 4.58      
11 A' 792 759 12.86      
12 A' 572 548 11.49      
13 A' 479 459 25.12      
14 A' 243 233 16.95      
15 A" 3138 3008 1.54      
16 A" 1467 1406 11.17      
17 A" 1073 1029 3.83      
18 A" 903 865 0.84      
19 A" 465 446 0.23      
20 A" 131 126 15.19      
21 A" 61 58 5.40      

Unscaled Zero Point Vibrational Energy (zpe) 14346.7 cm-1
Scaled (by 0.9584) Zero Point Vibrational Energy (zpe) 13749.9 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 B3PW91/6-31G**
ABC
0.30355 0.14765 0.10118

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.838 -0.730 0.000
C2 0.000 0.554 0.000
C3 1.492 0.395 0.000
O4 -0.354 -1.836 0.000
O5 -0.593 1.613 0.000
H6 -1.932 -0.538 0.000
H7 1.972 1.374 0.000
H8 1.805 -0.183 0.876
H9 1.805 -0.183 -0.876

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53342.58731.20772.35611.11043.51032.83802.8380
C21.53341.50032.41661.21392.21932.13572.13762.1376
C32.58731.50032.89592.41473.54861.09001.09501.0950
O41.20772.41662.89593.45802.04313.96412.85732.8573
O52.35611.21392.41473.45802.53432.57653.12173.1217
H61.11042.21933.54862.04312.53434.34713.85483.8548
H73.51032.13571.09003.96412.57654.34711.79351.7935
H82.83802.13761.09502.85733.12173.85481.79351.7516
H92.83802.13761.09502.85733.12173.85481.79351.7516

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 117.041 C1 C2 O5 117.631
C2 C1 O4 123.239 C2 C1 H6 113.195
C2 C3 H7 110.064 C2 C3 H8 109.915
C2 C3 H9 109.915 C3 C2 O5 125.328
O4 C1 H6 123.566 H7 C3 H8 110.329
H7 C3 H9 110.329 H8 C3 H9 106.222
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.223      
2 C 0.367      
3 C -0.460      
4 O -0.365      
5 O -0.410      
6 H 0.126      
7 H 0.170      
8 H 0.174      
9 H 0.174      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.980 -0.043 0.000 0.981
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.669 2.025 0.000
y 2.025 -36.980 0.000
z 0.000 0.000 -26.917
Traceless
 xyz
x 6.280 2.025 0.000
y 2.025 -10.687 0.000
z 0.000 0.000 4.408
Polar
3z2-r28.815
x2-y211.311
xy2.025
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.809 -0.396 0.000
y -0.396 6.349 0.000
z 0.000 0.000 3.325


<r2> (average value of r2) Å2
<r2> 111.725
(<r2>)1/2 10.570