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

using model chemistry: CISD/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 CISD/3-21G*
 hartrees
Energy at 0K-2638.798568
Energy at 298.15K 
HF Energy-2638.485043
Nuclear repulsion energy163.149310
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 CISD/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' 3175 2967 24.90      
2 A' 3163 2956 0.30      
3 A' 3104 2900 14.70      
4 A' 1608 1502 3.36      
5 A' 1588 1484 3.75      
6 A' 1515 1416 6.61      
7 A' 1366 1276 48.29      
8 A' 1122 1048 3.26      
9 A' 991 926 9.17      
10 A' 609 569 12.70      
11 A' 299 279 1.83      
12 A" 3230 3018 9.76      
13 A" 3188 2979 6.84      
14 A" 1598 1493 8.74      
15 A" 1347 1259 0.52      
16 A" 1104 1031 0.02      
17 A" 819 765 5.46      
18 A" 270 253 0.05      

Unscaled Zero Point Vibrational Energy (zpe) 15047.3 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 14060.2 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 CISD/3-21G*
ABC
0.97767 0.12552 0.11612

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.587 -2.033 0.000
C2 0.616 -1.077 0.000
Br3 0.000 0.796 0.000
H4 1.229 -1.193 0.891
H5 1.229 -1.193 -0.891
H6 -0.231 -3.069 0.000
H7 -1.202 -1.870 0.887
H8 -1.202 -1.870 -0.887

Atom - Atom Distances (Å)
  C1 C2 Br3 H4 H5 H6 H7 H8
C11.53622.88902.19052.19051.09511.09151.0915
C21.53621.97181.08801.08802.16442.17232.1723
Br32.88901.97182.50202.50203.87163.05583.0558
H42.19051.08802.50201.78232.53942.52373.0871
H52.19051.08802.50201.78232.53943.08712.5237
H61.09512.16443.87162.53942.53941.77901.7790
H71.09152.17233.05582.52373.08711.77901.7739
H81.09152.17233.05583.08712.52371.77901.7739

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 110.272 C1 C2 H4 112.049
C1 C2 H5 112.049 C2 C1 H6 109.550
C2 C1 H7 110.379 C2 C1 H8 110.379
Br3 C2 H4 106.078 Br3 C2 H5 106.078
H4 C2 H5 109.977 H6 C1 H7 108.897
H6 C1 H8 108.897 H7 C1 H8 108.702
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability