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All results from a given calculation for C2H5Br (Ethyl bromide)

using model chemistry: PBEPBE/3-21G

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/3-21G
 hartrees
Energy at 0K-2640.065346
Energy at 298.15K 
HF Energy-2640.065346
Nuclear repulsion energy161.066403
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/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' 3061 3033 22.55      
2 A' 3044 3016 2.11      
3 A' 2981 2954 13.48      
4 A' 1518 1504 4.93      
5 A' 1484 1470 4.79      
6 A' 1415 1402 10.21      
7 A' 1268 1257 48.27      
8 A' 1060 1050 1.62      
9 A' 972 963 22.34      
10 A' 562 557 12.12      
11 A' 280 278 2.57      
12 A" 3118 3089 13.26      
13 A" 3076 3048 4.93      
14 A" 1502 1489 10.89      
15 A" 1267 1255 1.19      
16 A" 1023 1014 0.09      
17 A" 768 761 9.30      
18 A" 253 251 0.00      

Unscaled Zero Point Vibrational Energy (zpe) 14325.2 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 14194.8 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/3-21G
ABC
0.97635 0.12179 0.11300

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.583 -2.057 0.000
C2 0.612 -1.107 0.000
Br3 0.000 0.809 0.000
H4 1.232 -1.216 0.900
H5 1.232 -1.216 -0.900
H6 -0.220 -3.102 0.000
H7 -1.207 -1.901 0.895
H8 -1.207 -1.901 -0.895

Atom - Atom Distances (Å)
  C1 C2 Br3 H4 H5 H6 H7 H8
C11.52662.92452.19422.19421.10681.10221.1022
C21.52662.01101.09911.09912.16152.17722.1772
Br32.92452.01102.53602.53603.91713.09863.0986
H42.19421.09912.53601.80072.54462.53383.1056
H52.19421.09912.53601.80072.54463.10562.5338
H61.10682.16153.91712.54462.54461.79431.7943
H71.10222.17723.09862.53383.10561.79431.7906
H81.10222.17723.09863.10562.53381.79431.7906

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 110.773 C1 C2 H4 112.344
C1 C2 H5 112.344 C2 C1 H6 109.291
C2 C1 H7 110.792 C2 C1 H8 110.792
Br3 C2 H4 105.468 Br3 C2 H5 105.468
H4 C2 H5 110.006 H6 C1 H7 108.640
H6 C1 H8 108.640 H7 C1 H8 108.631
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.591      
2 C -0.630      
3 Br 0.026      
4 H 0.261      
5 H 0.261      
6 H 0.217      
7 H 0.227      
8 H 0.227      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.427 -1.970 0.000 2.015
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -31.494 -0.832 0.000
y -0.832 -29.739 0.000
z 0.000 0.000 -31.851
Traceless
 xyz
x -0.699 -0.832 0.000
y -0.832 1.933 0.000
z 0.000 0.000 -1.234
Polar
3z2-r2-2.468
x2-y2-1.755
xy-0.832
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.784 -0.443 0.000
y -0.443 6.993 0.000
z 0.000 0.000 3.437


<r2> (average value of r2) Å2
<r2> 108.335
(<r2>)1/2 10.408