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/6-31G(2df,p)

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/6-31G(2df,p)
 hartrees
Energy at 0K-265.668915
Energy at 298.15K-265.673270
HF Energy-265.668915
Nuclear repulsion energy161.655228
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/6-31G(2df,p)
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' 3298 2986 9.17      
2 A' 3188 2887 1.35      
3 A' 3152 2854 65.87      
4 A' 2036 1844 6.51      
5 A' 2010 1820 308.63      
6 A' 1576 1427 12.85      
7 A' 1527 1383 23.26      
8 A' 1478 1338 7.98      
9 A' 1361 1232 26.31      
10 A' 1103 999 4.88      
11 A' 839 759 11.24      
12 A' 621 563 15.65      
13 A' 521 472 36.84      
14 A' 266 241 19.09      
15 A" 3253 2946 6.67      
16 A" 1586 1436 7.73      
17 A" 1199 1086 1.97      
18 A" 1007 912 1.14      
19 A" 518 469 2.62      
20 A" 150 136 16.45      
21 A" 114 103 12.26      

Unscaled Zero Point Vibrational Energy (zpe) 15401.7 cm-1
Scaled (by 0.9055) Zero Point Vibrational Energy (zpe) 13946.2 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/6-31G(2df,p)
ABC
0.30748 0.15128 0.10330

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.843 -0.725 0.000
C2 0.000 0.550 0.000
C3 1.495 0.389 0.000
O4 -0.373 -1.806 0.000
O5 -0.572 1.587 0.000
H6 -1.921 -0.535 0.000
H7 1.965 1.362 0.000
H8 1.803 -0.179 0.872
H9 1.803 -0.179 -0.872

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52922.58991.17852.32781.09453.49882.83982.8398
C21.52921.50362.38551.18362.20662.12562.13182.1318
C32.58991.50362.88162.38893.53871.08111.08511.0851
O41.17852.38552.88163.39832.00293.93702.85382.8538
O52.32781.18362.38893.39832.51442.54633.08543.0854
H61.09452.20663.53872.00292.51444.32413.84193.8419
H73.49882.12561.08113.93702.54634.32411.77801.7780
H82.83982.13181.08512.85383.08543.84191.77801.7437
H92.83982.13181.08512.85383.08543.84191.77801.7437

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 117.287 C1 C2 O5 117.639
C2 C1 O4 123.010 C2 C1 H6 113.461
C2 C3 H7 109.569 C2 C3 H8 109.822
C2 C3 H9 109.822 C3 C2 O5 125.073
O4 C1 H6 123.529 H7 C3 H8 110.332
H7 C3 H9 110.332 H8 C3 H9 106.931
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.159      
2 C 0.357      
3 C -0.499      
4 O -0.322      
5 O -0.375      
6 H 0.154      
7 H 0.175      
8 H 0.176      
9 H 0.176      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.837 -0.010 0.000 0.837
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.728 2.184 0.000
y 2.184 -38.095 0.000
z 0.000 0.000 -26.992
Traceless
 xyz
x 6.815 2.184 0.000
y 2.184 -11.735 0.000
z 0.000 0.000 4.920
Polar
3z2-r29.840
x2-y212.367
xy2.184
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.509 -0.362 0.000
y -0.362 6.114 0.000
z 0.000 0.000 3.559


<r2> (average value of r2) Å2
<r2> 110.200
(<r2>)1/2 10.498