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 C2H5Br (Ethyl bromide)

using model chemistry: PBEPBE/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at PBEPBE/6-31G
 hartrees
Energy at 0K-2650.257824
Energy at 298.15K 
HF Energy-2650.257824
Nuclear repulsion energy160.786069
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 PBEPBE/6-31G
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' 3071 3028 26.68      
2 A' 3055 3012 2.87      
3 A' 2982 2941 17.69      
4 A' 1499 1478 5.96      
5 A' 1478 1458 2.45      
6 A' 1417 1398 10.09      
7 A' 1258 1241 51.50      
8 A' 1078 1064 0.58      
9 A' 984 971 23.25      
10 A' 529 521 17.32      
11 A' 279 276 3.68      
12 A" 3137 3094 14.64      
13 A" 3090 3048 8.01      
14 A" 1483 1463 11.62      
15 A" 1254 1237 1.21      
16 A" 1011 997 0.03      
17 A" 773 763 7.95      
18 A" 260 256 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 14319.6 cm-1
Scaled (by 0.9862) Zero Point Vibrational Energy (zpe) 14122.0 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 PBEPBE/6-31G
ABC
0.96559 0.12184 0.11290

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/6-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.586 -2.048 0.000
C2 0.617 -1.123 0.000
Br3 0.000 0.809 0.000
H4 1.238 -1.214 0.902
H5 1.238 -1.214 -0.902
H6 -0.245 -3.101 0.000
H7 -1.211 -1.888 0.893
H8 -1.211 -1.888 -0.893

Atom - Atom Distances (Å)
  C1 C2 Br3 H4 H5 H6 H7 H8
C11.51772.91712.19892.19891.10661.10201.1020
C21.51772.02861.09861.09862.15782.17422.1742
Br32.91712.02862.53792.53793.91813.08893.0889
H42.19891.09862.53791.80372.56382.54063.1106
H52.19891.09862.53791.80372.56383.11062.5406
H61.10662.15783.91812.56382.56381.78961.7896
H71.10202.17423.08892.54063.11061.78961.7858
H81.10202.17423.08893.11062.54061.78961.7858

picture of Ethyl bromide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 Br3 109.848 C1 C2 H4 113.408
C1 C2 H5 113.408 C2 C1 H6 109.630
C2 C1 H7 111.188 C2 C1 H8 111.188
Br3 C2 H4 104.539 Br3 C2 H5 104.539
H4 C2 H5 110.345 H6 C1 H7 108.249
H6 C1 H8 108.249 H7 C1 H8 108.238
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.432      
2 C -0.507      
3 Br -0.022      
4 H 0.216      
5 H 0.216      
6 H 0.167      
7 H 0.180      
8 H 0.180      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.491 -2.288 0.000 2.340
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -31.565 -0.867 0.000
y -0.867 -29.819 0.000
z 0.000 0.000 -32.001
Traceless
 xyz
x -0.656 -0.867 0.000
y -0.867 1.965 0.000
z 0.000 0.000 -1.309
Polar
3z2-r2-2.618
x2-y2-1.747
xy-0.867
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.011 -0.464 0.000
y -0.464 7.368 0.000
z 0.000 0.000 3.644


<r2> (average value of r2) Å2
<r2> 108.431
(<r2>)1/2 10.413