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 CH3CBr3 (1,1,1-tribromoethane)

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 C3V 1A1
Energy calculated at PBEPBE/3-21G
 hartrees
Energy at 0K-7761.641659
Energy at 298.15K-7761.653339
HF Energy-7761.641659
Nuclear repulsion energy955.408239
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 A1 3002 2975 2.04      
2 A1 1422 1409 17.93      
3 A1 1040 1031 18.29      
4 A1 398 394 7.57      
5 A1 211 209 0.04      
6 A2 316 313 0.00      
7 E 3088 3060 2.68      
7 E 3088 3060 2.68      
8 E 1490 1476 3.49      
8 E 1490 1476 3.49      
9 E 1096 1086 69.32      
9 E 1096 1086 69.32      
10 E 620 615 120.97      
10 E 620 615 120.99      
11 E 282 280 1.69      
11 E 282 280 1.70      
12 E 145 143 0.02      
12 E 145 143 0.02      

Unscaled Zero Point Vibrational Energy (zpe) 9916.2 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 9826.0 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/3-21G
ABC
0.03386 0.03386 0.01993

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.451
C2 0.000 0.000 1.970
Br3 0.000 1.887 -0.205
Br4 1.634 -0.943 -0.205
Br5 -1.634 -0.943 -0.205
H6 0.000 -1.039 2.339
H7 0.899 0.519 2.339
H8 -0.899 0.519 2.339

Atom - Atom Distances (Å)
  C1 C2 Br3 Br4 Br5 H6 H7 H8
C11.51951.99721.99721.99722.15562.15562.1556
C21.51952.87932.87932.87931.10231.10231.1023
Br31.99722.87933.26763.26763.87703.02543.0254
Br41.99722.87933.26763.26763.02543.02543.8770
Br51.99722.87933.26763.26763.02543.87703.0254
H62.15561.10233.87703.02543.02541.79891.7989
H72.15561.10233.02543.02543.87701.79891.7989
H82.15561.10233.02543.87703.02541.79891.7989

picture of 1,1,1-tribromoethane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H6 109.579 C1 C2 H7 109.579
C1 C2 H8 109.579 C2 C1 Br3 109.165
C2 C1 Br4 109.165 C2 C1 Br5 109.165
Br3 C1 Br4 109.776 Br3 C1 Br5 109.776
Br4 C1 Br5 109.776 H6 C2 H7 109.363
H6 C2 H8 109.363 H7 C2 H8 109.363
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 -0.741      
2 C -0.533      
3 Br 0.175      
4 Br 0.175      
5 Br 0.175      
6 H 0.250      
7 H 0.250      
8 H 0.250      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 1.700 1.700
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -66.721 0.000 0.000
y 0.000 -66.721 0.000
z 0.000 0.000 -64.011
Traceless
 xyz
x -1.355 0.000 0.000
y 0.000 -1.355 0.000
z 0.000 0.000 2.710
Polar
3z2-r25.419
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 10.006 0.000 0.000
y 0.000 10.005 0.000
z 0.000 0.000 6.218


<r2> (average value of r2) Å2
<r2> 463.383
(<r2>)1/2 21.526