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All results from a given calculation for C3H4O2 (Methyl glyoxal)

using model chemistry: G4

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at G4
 hartrees
Energy at 0K-267.029005
Energy at 298.15K-267.022336
HF Energy-267.168348
Nuclear repulsion energy159.801069
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 B3LYP/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' 3163 3052 5.21      
2 A' 3047 2941 0.07      
3 A' 2924 2822 87.57      
4 A' 1825 1761 108.49      
5 A' 1812 1749 85.98      
6 A' 1454 1403 13.09      
7 A' 1386 1338 33.04      
8 A' 1361 1314 1.91      
9 A' 1241 1198 24.27      
10 A' 1008 973 3.14      
11 A' 779 752 13.56      
12 A' 569 549 11.85      
13 A' 477 460 24.77      
14 A' 245 236 15.67      
15 A" 3108 2999 2.14      
16 A" 1462 1410 8.21      
17 A" 1084 1046 2.38      
18 A" 908 876 0.99      
19 A" 471 454 0.53      
20 A" 138 133 13.37      
21 A" 73 71 5.54      

Unscaled Zero Point Vibrational Energy (zpe) 14266.8 cm-1
Scaled (by 0.965) Zero Point Vibrational Energy (zpe) 13767.5 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 B3LYP/6-31G(2df,p)
ABC
0.30317 0.14764 0.10113

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.840 -0.730 0.000
C2 0.000 0.557 0.000
C3 1.497 0.390 0.000
O4 -0.364 -1.834 0.000
O5 -0.586 1.614 0.000
H6 -1.933 -0.529 0.000
H7 1.982 1.366 0.000
H8 1.806 -0.190 0.876
H9 1.806 -0.190 -0.876

Atom - Atom Distances (Å)
  C1 C2 C3 O4 O5 H6 H7 H8 H9
C11.53672.59161.20252.35721.11073.51562.83952.8395
C21.53671.50602.41821.20852.21692.14102.14172.1417
C32.59161.50602.89972.41543.55061.09001.09511.0951
O41.20252.41822.89973.45472.04053.96792.85982.8598
O52.35721.20852.41543.45472.53092.58003.12143.1214
H61.11072.21693.55062.04052.53094.34963.85523.8552
H73.51562.14101.09003.96792.58004.34961.79431.7943
H82.83952.14171.09512.85983.12143.85521.79431.7512
H92.83952.14171.09512.85983.12143.85521.79431.7512

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 116.546 C1 C2 O5 118.350
C2 C1 O4 123.710 C2 C1 H6 112.611
C2 C3 H7 109.661 C2 C3 H8 110.062
C2 C3 H9 110.062 C3 C2 O5 125.104
O4 C1 H6 123.680 H7 C3 H8 110.280
H7 C3 H9 110.280 H8 C3 H9 106.453
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.075      
2 C 0.304      
3 C -0.479      
4 O -0.208      
5 O -0.264      
6 H 0.107      
7 H 0.147      
8 H 0.159      
9 H 0.159      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.943 -0.031 0.000 0.943
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


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


<r2> (average value of r2) Å2
<r2> 111.792
(<r2>)1/2 10.573