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 C2H5 (Ethyl radical)

using model chemistry: B2PLYP/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/3-21G*
 hartrees
Energy at 0K-78.586629
Energy at 298.15K-78.590462
HF Energy-78.531721
Nuclear repulsion energy36.797143
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/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' 3188 3188 13.27      
2 A' 3092 3092 21.70      
3 A' 3009 3009 21.61      
4 A' 1570 1570 6.36      
5 A' 1530 1530 0.36      
6 A' 1483 1483 4.51      
7 A' 1049 1049 0.94      
8 A' 1029 1029 0.62      
9 A' 455 455 62.84      
10 A" 3293 3293 16.65      
11 A" 3132 3132 18.65      
12 A" 1579 1579 5.40      
13 A" 1249 1249 3.61      
14 A" 855 855 3.92      
15 A" 119 119 0.13      

Unscaled Zero Point Vibrational Energy (zpe) 13316.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 13316.5 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 B2PLYP/3-21G*
ABC
3.44278 0.74927 0.69536

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.011 -0.701 0.000
C2 -0.011 0.801 0.000
H3 1.013 -1.107 0.000
H4 -0.513 -1.098 0.887
H5 -0.513 -1.098 -0.887
H6 0.071 1.352 -0.927
H7 0.071 1.352 0.927

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5 H6 H7
C11.50141.10151.09431.09432.25372.2537
C21.50142.16502.15512.15511.08191.0819
H31.10152.16501.76561.76562.79152.7915
H41.09432.15511.76561.77443.10402.5186
H51.09432.15511.76561.77442.51863.1040
H62.25371.08192.79153.10402.51861.8550
H72.25371.08192.79152.51863.10401.8550

picture of Ethyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H6 120.615 C1 C2 H7 120.615
C2 C1 H3 111.639 C2 C1 H4 111.280
C2 C1 H5 111.280 H3 C1 H4 107.044
H3 C1 H5 107.044 H4 C1 H5 108.340
H6 C2 H7 118.026
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.607      
2 C -0.353      
3 H 0.200      
4 H 0.198      
5 H 0.198      
6 H 0.181      
7 H 0.181      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.143 -0.192 0.000 0.239
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -15.158 0.190 0.000
y 0.190 -14.046 0.000
z 0.000 0.000 -13.612
Traceless
 xyz
x -1.329 0.190 0.000
y 0.190 0.339 0.000
z 0.000 0.000 0.990
Polar
3z2-r21.980
x2-y2-1.112
xy0.190
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.100 -0.003 0.000
y -0.003 3.343 0.000
z 0.000 0.000 2.997


<r2> (average value of r2) Å2
<r2> 27.857
(<r2>)1/2 5.278