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All results from a given calculation for CH3CBr3 (1,1,1-tribromoethane)

using model chemistry: MP2/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-7757.500032
Energy at 298.15K-7757.511818
HF Energy-7757.198211
Nuclear repulsion energy951.399499
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 MP2/3-21G
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 3102 2961 3.25      
2 A1 1511 1443 9.82      
3 A1 1054 1006 6.26      
4 A1 396 378 4.77      
5 A1 213 203 0.03      
6 A2 326 312 0.00      
7 E 3187 3042 3.06      
7 E 3187 3042 3.06      
8 E 1576 1505 3.75      
8 E 1576 1505 3.75      
9 E 1168 1115 48.88      
9 E 1168 1115 48.88      
10 E 659 629 60.84      
10 E 659 629 60.84      
11 E 287 274 0.73      
11 E 287 274 0.73      
12 E 149 142 0.06      
12 E 149 142 0.06      

Unscaled Zero Point Vibrational Energy (zpe) 10326.9 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 9857.1 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 MP2/3-21G
ABC
0.03357 0.03357 0.01976

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.455
C2 0.000 0.000 1.981
Br3 0.000 1.894 -0.206
Br4 1.641 -0.947 -0.206
Br5 -1.641 -0.947 -0.206
H6 0.000 -1.029 2.349
H7 0.892 0.515 2.349
H8 -0.892 0.515 2.349

Atom - Atom Distances (Å)
  C1 C2 Br3 Br4 Br5 H6 H7 H8
C11.52582.00672.00672.00672.15572.15572.1557
C21.52582.89382.89382.89381.09331.09331.0933
Br32.00672.89383.28133.28133.88343.03813.0381
Br42.00672.89383.28133.28133.03813.03813.8834
Br52.00672.89383.28133.28133.03813.88343.0381
H62.15571.09333.88343.03813.03811.78311.7831
H72.15571.09333.03813.03813.88341.78311.7831
H82.15571.09333.03813.88343.03811.78311.7831

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 109.680 C1 C2 H7 109.680
C1 C2 H8 109.680 C2 C1 Br3 109.252
C2 C1 Br4 109.252 C2 C1 Br5 109.252
Br3 C1 Br4 109.689 Br3 C1 Br5 109.689
Br4 C1 Br5 109.689 H6 C2 H7 109.262
H6 C2 H8 109.262 H7 C2 H8 109.262
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability