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 C2H5OO (ethylperoxy radical)

using model chemistry: mPW1PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at mPW1PW91/3-21G
 hartrees
Energy at 0K-228.221711
Energy at 298.15K-228.227627
HF Energy-228.221711
Nuclear repulsion energy121.267543
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 mPW1PW91/3-21G
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' 3169 3026 11.25      
2 A' 3114 2973 9.56      
3 A' 3092 2952 6.69      
4 A' 1571 1500 9.81      
5 A' 1560 1489 3.58      
6 A' 1468 1401 19.01      
7 A' 1385 1322 14.99      
8 A' 1159 1106 9.04      
9 A' 1132 1081 34.60      
10 A' 1029 983 13.73      
11 A' 854 815 1.65      
12 A' 478 456 9.88      
13 A' 290 277 0.76      
14 A" 3188 3043 26.40      
15 A" 3162 3018 0.64      
16 A" 1552 1482 9.91      
17 A" 1309 1249 0.60      
18 A" 1159 1106 5.03      
19 A" 846 808 3.70      
20 A" 220 210 0.45      
21 A" 81 77 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 15908.9 cm-1
Scaled (by 0.9546) Zero Point Vibrational Energy (zpe) 15186.7 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 mPW1PW91/3-21G
ABC
1.05584 0.14325 0.13248

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.497 0.942 0.000
C2 0.000 0.687 0.000
O3 -0.162 -0.795 0.000
O4 -1.538 -1.074 0.000
H5 1.692 2.018 0.000
H6 1.955 0.500 0.888
H7 1.955 0.500 -0.888
H8 -0.491 1.077 -0.893
H9 -0.491 1.077 0.893

Atom - Atom Distances (Å)
  C1 C2 O3 O4 H5 H6 H7 H8 H9
C11.51832.40153.64341.09381.09281.09282.18312.1831
C21.51831.49042.33782.15302.15572.15571.09121.0912
O32.40151.49041.40443.36892.63602.63602.09952.0995
O43.64342.33781.40444.47153.93343.93342.55312.5531
H51.09382.15303.36894.47151.77831.77832.53952.5395
H61.09282.15572.63603.93341.77831.77613.08042.5131
H71.09282.15572.63603.93341.77831.77612.51313.0804
H82.18311.09122.09952.55312.53953.08042.51311.7868
H92.18311.09122.09952.55312.53952.51313.08041.7868

picture of ethylperoxy radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 105.911 C1 C2 H8 112.536
C1 C2 H9 112.536 C2 C1 H5 109.958
C2 C1 H6 110.232 C2 C1 H7 110.232
C2 O3 O4 107.685 O3 C2 H8 107.825
O3 C2 H9 107.825 H5 C1 H6 108.837
H5 C1 H7 108.837 H6 C1 H7 108.706
H8 C2 H9 109.914
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.668      
2 C -0.196      
3 O -0.235      
4 O -0.110      
5 H 0.230      
6 H 0.243      
7 H 0.243      
8 H 0.246      
9 H 0.246      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.262 2.531 0.000 2.828
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -24.786 -0.896 0.000
y -0.896 -24.773 0.000
z 0.000 0.000 -22.859
Traceless
 xyz
x -0.970 -0.896 0.000
y -0.896 -0.950 0.000
z 0.000 0.000 1.920
Polar
3z2-r23.840
x2-y2-0.013
xy-0.896
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 5.085 1.032 0.000
y 1.032 4.023 0.000
z 0.000 0.000 3.235


<r2> (average value of r2) Å2
<r2> 91.145
(<r2>)1/2 9.547