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 N2O4 (Dinitrogen tetroxide)

using model chemistry: HF/CEP-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D2D 1Ag
Energy calculated at HF/CEP-31G
 hartrees
Energy at 0K-81.587910
Energy at 298.15K 
HF Energy-81.587910
Nuclear repulsion energy130.049326
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/CEP-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 Ag 1359 1225 0.00 76.56 0.62 0.77
2 Ag 845 762 0.00 33.96 0.31 0.47
3 Ag 444 400 0.00 45.23 0.41 0.59
4 Au 50 45 0.00 0.00 0.00 0.00
5 B1u 1384 1248 255.43 0.00 0.75 0.86
6 B1u 793 715 158.22 0.00 0.75 0.86
7 B2g 752 678 0.00 5.76 0.75 0.86
8 B2u 1661 1498 1042.18 0.00 0.69 0.82
9 B2u 343 310 0.09 0.00 0.62 0.77
10 B3g 1665 1501 0.00 3.68 0.75 0.86
11 B3g 570 514 0.00 6.18 0.75 0.86
12 B3u 520 469 20.19 0.00 0.00 0.00

Unscaled Zero Point Vibrational Energy (zpe) 5192.7 cm-1
Scaled (by 0.9014) Zero Point Vibrational Energy (zpe) 4680.7 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/CEP-31G
ABC
0.21239 0.13472 0.08243

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-31G

Point Group is D2h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 0.792
N2 0.000 0.000 -0.792
O3 0.000 1.114 1.297
O4 0.000 -1.114 1.297
O5 0.000 1.114 -1.297
O6 0.000 -1.114 -1.297

Atom - Atom Distances (Å)
  N1 N2 O3 O4 O5 O6
N11.58341.22291.22292.36692.3669
N21.58342.36692.36691.22291.2229
O31.22292.36692.22762.59343.4188
O41.22292.36692.22763.41882.5934
O52.36691.22292.59343.41882.2276
O62.36691.22293.41882.59342.2276

picture of Dinitrogen tetroxide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 N2 O5 114.389 N1 N2 O6 114.389
N2 N1 O3 114.389 N2 N1 O4 114.389
O3 N1 O4 131.222 O5 N2 O6 131.222
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N 0.097      
2 N 0.097      
3 O -0.049      
4 O -0.049      
5 O -0.049      
6 O -0.049      


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


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.043 0.000 0.000
y 0.000 -40.009 0.000
z 0.000 0.000 -37.705
Traceless
 xyz
x 8.814 0.000 0.000
y 0.000 -6.136 0.000
z 0.000 0.000 -2.679
Polar
3z2-r2-5.358
x2-y29.967
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.550 0.000 0.000
y 0.000 7.907 0.000
z 0.000 0.000 4.985


<r2> (average value of r2) Å2
<r2> 98.830
(<r2>)1/2 9.941