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: LSDA/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 LSDA/6-31G**
 hartrees
Energy at 0K-265.744441
Energy at 298.15K 
HF Energy-265.744441
Nuclear repulsion energy160.384949
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 LSDA/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' 3135 3076 1.04      
2 A' 2997 2941 1.88      
3 A' 2844 2791 87.20      
4 A' 1812 1778 135.37      
5 A' 1799 1765 35.86      
6 A' 1385 1360 16.34      
7 A' 1338 1313 73.57      
8 A' 1297 1273 1.11      
9 A' 1232 1209 8.12      
10 A' 965 947 6.96      
11 A' 801 786 11.88      
12 A' 560 549 7.87      
13 A' 461 453 23.30      
14 A' 238 234 18.25      
15 A" 3068 3011 0.13      
16 A" 1390 1364 15.30      
17 A" 1033 1014 4.76      
18 A" 854 838 1.60      
19 A" 450 442 0.00      
20 A" 131 129 12.13      
21 A" 59i 58i 5.76      

Unscaled Zero Point Vibrational Energy (zpe) 13866.2 cm-1
Scaled (by 0.9813) Zero Point Vibrational Energy (zpe) 13606.9 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 LSDA/6-31G**
ABC
0.30732 0.14989 0.10265

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.831 -0.715 0.000
C2 0.000 0.554 0.000
C3 1.471 0.370 0.000
O4 -0.339 -1.822 0.000
O5 -0.589 1.619 0.000
H6 -1.938 -0.517 0.000
H7 1.983 1.342 0.000
H8 1.771 -0.230 0.877
H9 1.771 -0.230 -0.877

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.51722.54541.21042.34721.12423.48552.78882.7888
C21.51721.48262.39961.21742.21382.13342.12622.1262
C32.54541.48262.84302.40943.52231.09791.10401.1040
O41.21042.39962.84303.44982.06303.92412.78542.7854
O52.34721.21742.40943.44982.52622.58673.12413.1241
H61.12422.21383.52232.06302.52624.33853.82203.8220
H73.48552.13341.09793.92412.58674.33851.81191.8119
H82.78882.12621.10402.78543.12413.82201.81191.7535
H92.78882.12621.10402.78543.12413.82201.81191.7535

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 116.093 C1 C2 O5 117.842
C2 C1 O4 122.829 C2 C1 H6 113.042
C2 C3 H7 110.645 C2 C3 H8 109.704
C2 C3 H9 109.704 C3 C2 O5 126.064
O4 C1 H6 124.129 H7 C3 H8 110.747
H7 C3 H9 110.747 H8 C3 H9 105.155
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at LSDA/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.166      
2 C 0.330      
3 C -0.501      
4 O -0.312      
5 O -0.358      
6 H 0.119      
7 H 0.178      
8 H 0.189      
9 H 0.189      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.080 -0.109 0.000 1.086
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.825 1.891 0.000
y 1.891 -36.582 0.000
z 0.000 0.000 -27.056
Traceless
 xyz
x 5.994 1.891 0.000
y 1.891 -10.141 0.000
z 0.000 0.000 4.147
Polar
3z2-r28.295
x2-y210.757
xy1.891
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.108 -0.375 0.000
y -0.375 6.448 0.000
z 0.000 0.000 3.368


<r2> (average value of r2) Å2
<r2> 110.381
(<r2>)1/2 10.506