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: B1B95/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B1B95/3-21G
 hartrees
Energy at 0K-265.557429
Energy at 298.15K-265.561566
HF Energy-265.557429
Nuclear repulsion energy159.847001
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 B1B95/3-21G
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' 3212 3073 3.10      
2 A' 3092 2958 0.29      
3 A' 3009 2879 81.86      
4 A' 1785 1708 40.53      
5 A' 1761 1685 67.69      
6 A' 1510 1444 17.54      
7 A' 1444 1382 56.72      
8 A' 1371 1312 3.08      
9 A' 1234 1180 31.70      
10 A' 1024 980 3.39      
11 A' 791 757 13.88      
12 A' 585 560 7.62      
13 A' 468 447 19.22      
14 A' 259 247 21.20      
15 A" 3152 3016 0.62      
16 A" 1530 1464 17.21      
17 A" 1128 1079 7.64      
18 A" 960 919 0.54      
19 A" 515 492 0.20      
20 A" 201 193 15.31      
21 A" 30 29 3.20      

Unscaled Zero Point Vibrational Energy (zpe) 14529.9 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 13900.8 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 B1B95/3-21G
ABC
0.30580 0.14918 0.10215

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.850 -0.693 0.000
C2 0.000 0.567 0.000
C3 1.473 0.302 0.000
O4 -0.360 -1.815 0.000
O5 -0.556 1.662 0.000
H6 -1.929 -0.479 0.000
H7 2.031 1.236 0.000
H8 1.738 -0.296 0.877
H9 1.738 -0.296 -0.877

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.51902.52701.22432.37281.10043.46702.76102.7610
C21.51901.49702.40801.22822.19422.13882.12932.1293
C32.52701.49702.79992.44263.49101.08801.09381.0938
O41.22432.40802.79993.48202.06093.87592.73402.7340
O52.37281.22822.44263.48202.54362.62173.14073.1407
H61.10042.19423.49102.06092.54364.31583.77513.7751
H73.46702.13881.08803.87592.62174.31581.78941.7894
H82.76102.12931.09382.73403.14073.77511.78941.7533
H92.76102.12931.09382.73403.14073.77511.78941.7533

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 113.834 C1 C2 O5 119.093
C2 C1 O4 122.389 C2 C1 H6 112.814
C2 C3 H7 110.667 C2 C3 H8 109.569
C2 C3 H9 109.569 C3 C2 O5 127.073
O4 C1 H6 124.797 H7 C3 H8 110.199
H7 C3 H9 110.199 H8 C3 H9 106.549
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.207      
2 C 0.324      
3 C -0.680      
4 O -0.405      
5 O -0.423      
6 H 0.216      
7 H 0.249      
8 H 0.256      
9 H 0.256      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.802 -0.135 0.000 0.813
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.949 1.756 0.000
y 1.756 -37.377 0.000
z 0.000 0.000 -27.294
Traceless
 xyz
x 6.387 1.756 0.000
y 1.756 -10.756 0.000
z 0.000 0.000 4.369
Polar
3z2-r28.738
x2-y211.428
xy1.756
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.120 -0.491 0.000
y -0.491 5.773 0.000
z 0.000 0.000 2.777


<r2> (average value of r2) Å2
<r2> 110.874
(<r2>)1/2 10.530