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

using model chemistry: QCISD/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 QCISD/3-21G*
 hartrees
Energy at 0K-2638.836541
Energy at 298.15K 
HF Energy-2638.484344
Nuclear repulsion energy162.415400
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 QCISD/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' 3102 2981 24.45      
2 A' 3088 2968 1.56      
3 A' 3032 2914 14.86      
4 A' 1577 1516 3.05      
5 A' 1557 1496 3.20      
6 A' 1481 1423 5.83      
7 A' 1333 1281 44.79      
8 A' 1095 1052 2.80      
9 A' 965 927 8.26      
10 A' 591 568 10.36      
11 A' 292 281 1.72      
12 A" 3153 3030 11.48      
13 A" 3115 2994 6.67      
14 A" 1567 1506 7.89      
15 A" 1317 1266 0.48      
16 A" 1078 1036 0.03      
17 A" 801 770 4.99      
18 A" 265 255 0.04      

Unscaled Zero Point Vibrational Energy (zpe) 14704.4 cm-1
Scaled (by 0.9611) Zero Point Vibrational Energy (zpe) 14132.4 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 QCISD/3-21G*
ABC
0.96577 0.12454 0.11517

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.590 -2.040 0.000
C2 0.620 -1.083 0.000
Br3 0.000 0.799 0.000
H4 1.236 -1.199 0.896
H5 1.236 -1.199 -0.896
H6 -0.236 -3.082 0.000
H7 -1.208 -1.874 0.892
H8 -1.208 -1.874 -0.892

Atom - Atom Distances (Å)
  C1 C2 Br3 H4 H5 H6 H7 H8
C11.54352.90002.20202.20201.10061.09721.0972
C21.54351.98131.09401.09402.17502.18202.1820
Br32.90001.98132.51462.51463.88843.06533.0653
H42.20201.09402.51461.79302.55312.53533.1025
H52.20201.09402.51461.79302.55313.10252.5353
H61.10062.17503.88842.55312.55311.78891.7889
H71.09722.18203.06532.53533.10251.78891.7836
H81.09722.18203.06533.10252.53531.78891.7836

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 110.103 C1 C2 H4 112.082
C1 C2 H5 112.082 C2 C1 H6 109.547
C2 C1 H7 110.296 C2 C1 H8 110.296
Br3 C2 H4 106.083 Br3 C2 H5 106.083
H4 C2 H5 110.064 H6 C1 H7 108.967
H6 C1 H8 108.967 H7 C1 H8 108.737
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability