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 C2H2O (Oxirene)

using model chemistry: B97D3/aug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B97D3/aug-cc-pVDZ
 hartrees
Energy at 0K-152.405715
Energy at 298.15K 
HF Energy-152.405715
Nuclear repulsion energy60.736890
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 B97D3/aug-cc-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3348 3348 1.52 99.90 0.19 0.31
2 A1 1785 1785 3.75 95.34 0.10 0.18
3 A1 1029 1029 11.50 6.17 0.62 0.77
4 A1 850 850 61.16 7.29 0.75 0.86
5 A2 532 532 0.00 5.36 0.75 0.86
6 B1 481 481 84.55 0.07 0.75 0.86
7 B2 3276 3276 37.70 18.69 0.75 0.86
8 B2 915 915 8.02 2.80 0.75 0.86
9 B2 289i 289i 3.49 19.73 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5963.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5963.5 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 B97D3/aug-cc-pVDZ
ABC
1.09195 0.86134 0.48152

See section I.F.4 to change rotational constant units
Geometric Data calculated at B97D3/aug-cc-pVDZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.904
C2 0.000 0.640 -0.468
C3 0.000 -0.640 -0.468
H4 0.000 1.667 -0.806
H5 0.000 -1.667 -0.806

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.51381.51382.38842.3884
C21.51381.28021.08162.3322
C31.51381.28022.33221.0816
H42.38841.08162.33223.3349
H52.38842.33221.08163.3349

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.985 O1 C2 H4 133.238
O1 C3 C2 64.985 O1 C3 H5 133.238
C2 O1 C3 50.030 C2 C3 H5 161.777
C3 C2 H4 161.777
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B97D3/aug-cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.588      
2 C 0.650      
3 C 0.650      
4 H -0.356      
5 H -0.356      


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 -2.329 2.329
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.936 0.000 0.000
y 0.000 -11.912 0.000
z 0.000 0.000 -19.177
Traceless
 xyz
x -3.391 0.000 0.000
y 0.000 7.145 0.000
z 0.000 0.000 -3.753
Polar
3z2-r2-7.507
x2-y2-7.024
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.212 0.000 0.000
y 0.000 5.093 0.000
z 0.000 0.000 4.194


<r2> (average value of r2) Å2
<r2> 31.355
(<r2>)1/2 5.600