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: B1B95/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B1B95/6-311G*
 hartrees
Energy at 0K-267.108435
Energy at 298.15K 
HF Energy-267.108435
Nuclear repulsion energy160.652381
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 B1B95/6-311G*
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' 3194 3062 6.72      
2 A' 3076 2949 0.19      
3 A' 2965 2842 99.16      
4 A' 1853 1777 83.27      
5 A' 1843 1767 150.70      
6 A' 1470 1409 19.52      
7 A' 1402 1344 46.07      
8 A' 1364 1308 2.49      
9 A' 1262 1210 21.16      
10 A' 1008 966 4.56      
11 A' 797 764 12.04      
12 A' 575 552 11.37      
13 A' 479 459 27.21      
14 A' 222 213 15.90      
15 A" 3140 3010 3.74      
16 A" 1468 1407 12.94      
17 A" 1082 1037 3.39      
18 A" 905 867 0.61      
19 A" 468 449 0.14      
20 A" 134 129 18.70      
21 A" 105i 100i 2.80      

Unscaled Zero Point Vibrational Energy (zpe) 14302.0 cm-1
Scaled (by 0.9586) Zero Point Vibrational Energy (zpe) 13709.9 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 B1B95/6-311G*
ABC
0.30670 0.14941 0.10233

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.837 -0.725 0.000
C2 0.000 0.555 0.000
C3 1.484 0.386 0.000
O4 -0.357 -1.822 0.000
O5 -0.584 1.607 0.000
H6 -1.928 -0.541 0.000
H7 1.972 1.356 0.000
H8 1.796 -0.192 0.872
H9 1.796 -0.192 -0.872

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.52922.57321.19712.34631.10683.49572.82382.8238
C21.52921.49392.40331.20352.21742.12832.13132.1313
C32.57321.49392.87442.40183.53581.08611.09121.0912
O41.19712.40332.87443.43672.02763.93982.83702.8370
O52.34631.20352.40183.43672.53392.56753.10793.1079
H61.10682.21743.53582.02762.53394.33653.84033.8403
H73.49572.12831.08613.93982.56754.33651.78571.7857
H82.82382.13131.09122.83703.10793.84031.78571.7433
H92.82382.13131.09122.83703.10793.84031.78571.7433

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 116.670 C1 C2 O5 117.824
C2 C1 O4 123.187 C2 C1 H6 113.562
C2 C3 H7 110.155 C2 C3 H8 110.092
C2 C3 H9 110.092 C3 C2 O5 125.507
O4 C1 H6 123.250 H7 C3 H8 110.195
H7 C3 H9 110.195 H8 C3 H9 106.036
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/6-311G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.043      
2 C 0.240      
3 C -0.726      
4 O -0.253      
5 O -0.270      
6 H 0.199      
7 H 0.255      
8 H 0.257      
9 H 0.257      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.920 -0.064 0.000 0.922
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.093 2.056 0.000
y 2.056 -37.386 0.000
z 0.000 0.000 -27.229
Traceless
 xyz
x 6.215 2.056 0.000
y 2.056 -10.725 0.000
z 0.000 0.000 4.510
Polar
3z2-r29.020
x2-y211.293
xy2.056
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 6.055 -0.401 0.000
y -0.401 6.412 0.000
z 0.000 0.000 3.488


<r2> (average value of r2) Å2
<r2> 110.943
(<r2>)1/2 10.533