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: HF/6-311G**

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/6-311G**
 hartrees
Energy at 0K-265.710661
Energy at 298.15K-265.715014
HF Energy-265.710661
Nuclear repulsion energy161.622086
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/6-311G**
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' 3291 2990 10.41      
2 A' 3186 2894 1.47      
3 A' 3157 2868 70.71      
4 A' 2030 1844 7.02      
5 A' 2000 1817 344.46      
6 A' 1577 1433 14.83      
7 A' 1528 1388 25.47      
8 A' 1475 1340 8.10      
9 A' 1363 1238 25.80      
10 A' 1104 1003 4.69      
11 A' 840 763 11.49      
12 A' 625 568 16.94      
13 A' 527 479 37.54      
14 A' 269 245 19.19      
15 A" 3247 2950 9.90      
16 A" 1584 1439 9.98      
17 A" 1190 1081 1.96      
18 A" 1003 911 0.79      
19 A" 518 470 2.12      
20 A" 145 132 19.59      
21 A" 108 98 10.96      

Unscaled Zero Point Vibrational Energy (zpe) 15382.1 cm-1
Scaled (by 0.9085) Zero Point Vibrational Energy (zpe) 13974.7 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/6-311G**
ABC
0.30761 0.15112 0.10324

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-311G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.842 -0.728 0.000
C2 0.000 0.550 0.000
C3 1.494 0.394 0.000
O4 -0.370 -1.808 0.000
O5 -0.575 1.585 0.000
H6 -1.920 -0.542 0.000
H7 1.957 1.371 0.000
H8 1.806 -0.171 0.872
H9 1.806 -0.171 -0.872

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52992.59171.17902.32781.09393.49872.84382.8438
C21.52991.50222.38601.18452.20922.12262.13142.1314
C32.59171.50222.88462.38763.54061.08091.08501.0850
O41.17902.38602.88463.39882.00143.93912.85932.8593
O52.32781.18452.38763.39882.51702.54183.08483.0848
H61.09392.20923.54062.00142.51704.32413.84563.8456
H73.49872.12261.08093.93912.54184.32411.77741.7774
H82.84382.13141.08502.85933.08483.84561.77741.7443
H92.84382.13141.08502.85933.08483.84561.77741.7443

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 117.465 C1 C2 O5 117.534
C2 C1 O4 122.955 C2 C1 H6 113.667
C2 C3 H7 109.438 C2 C3 H8 109.893
C2 C3 H9 109.893 C3 C2 O5 125.001
O4 C1 H6 123.378 H7 C3 H8 110.294
H7 C3 H9 110.294 H8 C3 H9 107.001
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.252      
2 C 0.212      
3 C -0.241      
4 O -0.346      
5 O -0.366      
6 H 0.108      
7 H 0.131      
8 H 0.125      
9 H 0.125      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.856 -0.022 0.000 0.856
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.952 2.307 0.000
y 2.307 -38.913 0.000
z 0.000 0.000 -27.278
Traceless
 xyz
x 7.144 2.307 0.000
y 2.307 -12.298 0.000
z 0.000 0.000 5.154
Polar
3z2-r210.308
x2-y212.961
xy2.307
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.459 -0.509 0.000
y -0.509 6.125 0.000
z 0.000 0.000 3.412


<r2> (average value of r2) Å2
<r2> 110.530
(<r2>)1/2 10.513