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 CH3C(O)OO (acetyl peroxy radical)

using model chemistry: B3LYP/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3LYP/6-31G(2df,p)
 hartrees
Energy at 0K-303.582051
Energy at 298.15K-303.586081
HF Energy-303.582051
Nuclear repulsion energy171.181319
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' 3177 3066 2.16      
2 A' 3070 2963 0.19      
3 A' 1911 1844 208.06      
4 A' 1454 1403 8.98      
5 A' 1393 1344 27.30      
6 A' 1205 1162 44.00      
7 A' 1141 1101 108.68      
8 A' 984 949 36.92      
9 A' 748 721 41.21      
10 A' 559 539 8.04      
11 A' 501 483 13.39      
12 A' 330 319 8.95      
13 A" 3139 3029 0.29      
14 A" 1463 1412 8.00      
15 A" 1046 1009 9.05      
16 A" 546 527 5.75      
17 A" 154 149 0.88      
18 A" 142 137 1.16      

Unscaled Zero Point Vibrational Energy (zpe) 11480.8 cm-1
Scaled (by 0.965) Zero Point Vibrational Energy (zpe) 11079.0 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
0.30973 0.16159 0.10830

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 1.453 0.200 0.000
C2 0.000 0.568 0.000
O3 -0.502 1.644 0.000
O4 -0.922 -0.537 0.000
O5 -0.342 -1.722 0.000
H6 2.032 1.123 0.000
H7 1.693 -0.405 0.877
H8 1.693 -0.405 -0.877

Atom - Atom Distances (Å)
  C1 C2 O3 O4 O5 H6 H7 H8
C11.49852.42982.48712.63051.08911.09231.0923
C21.49851.18731.43982.31592.10612.14052.1405
O32.42981.18732.22173.37032.58653.12783.1278
O42.48711.43982.22171.31933.38872.76182.7618
O52.63052.31593.37031.31933.70572.57852.5785
H61.08912.10612.58653.38873.70571.79371.7937
H71.09232.14053.12782.76182.57851.79371.7544
H81.09232.14053.12782.76182.57851.79371.7544

picture of acetyl peroxy radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 129.204 C1 C2 O4 115.639
C2 C1 H6 107.913 C2 C1 H7 110.434
C2 C1 H8 110.434 C2 O4 O5 114.077
O3 C2 O4 115.157 H6 C1 H7 110.621
H6 C1 H8 110.621 H7 C1 H8 106.839
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability