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 CH3CO (Acetyl radical)

using model chemistry: B2PLYP=FULL/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 B2PLYP=FULL/3-21G
 hartrees
Energy at 0K-152.130974
Energy at 298.15K-152.133228
HF Energy-152.026449
Nuclear repulsion energy61.850348
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 B2PLYP=FULL/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' 3159 3007 7.10      
2 A' 3075 2927 5.05      
3 A' 1790 1704 54.08      
4 A' 1544 1470 23.71      
5 A' 1435 1366 20.90      
6 A' 1078 1026 15.88      
7 A' 803 764 6.56      
8 A' 437 416 3.55      
9 A" 3164 3012 1.42      
10 A" 1548 1474 15.68      
11 A" 1013 964 0.58      
12 A" 116 111 2.38      

Unscaled Zero Point Vibrational Energy (zpe) 9580.8 cm-1
Scaled (by 0.952) Zero Point Vibrational Energy (zpe) 9120.9 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 B2PLYP=FULL/3-21G
ABC
2.83393 0.31745 0.30153

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.984 -0.686 0.000
C2 0.000 0.487 0.000
O3 1.201 0.507 0.000
H4 -0.463 -1.649 0.000
H5 -1.623 -0.606 0.882
H6 -1.623 -0.606 -0.882

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.53112.48931.09471.09221.0922
C21.53111.20142.18592.14672.1467
O32.48931.20142.72343.16133.1613
H41.09472.18592.72341.79201.7920
H51.09222.14673.16131.79201.7637
H61.09222.14673.16131.79201.7637

picture of Acetyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 130.904 C2 C1 H4 111.622
C2 C1 H5 108.674 C2 C1 H6 108.674
H4 C1 H5 110.045 H4 C1 H6 110.045
H5 C1 H6 107.681
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability