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All results from a given calculation for CH3Br (methyl bromide)

using model chemistry: B2PLYP/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 B2PLYP/3-21G
 hartrees
Energy at 0K-2600.946012
Energy at 298.15K 
HF Energy-2600.902225
Nuclear repulsion energy86.856740
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 B2PLYP/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 3139 3139 13.24 103.10 0.01 0.02
2 A1 1403 1403 20.37 0.42 0.70 0.83
3 A1 591 591 12.07 21.49 0.36 0.53
4 E 3244 3244 4.32 57.44 0.75 0.86
4 E 3244 3244 4.32 57.44 0.75 0.86
5 E 1557 1557 9.99 21.51 0.75 0.86
5 E 1557 1557 9.99 21.51 0.75 0.86
6 E 984 984 8.52 11.51 0.75 0.86
6 E 984 984 8.52 11.51 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 8350.9 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 8350.9 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 B2PLYP/3-21G
ABC
5.20541 0.30098 0.30098

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.573
Br2 0.000 0.000 0.432
H3 0.000 1.035 -1.900
H4 0.896 -0.517 -1.900
H5 -0.896 -0.517 -1.900

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.00511.08551.08551.0855
Br22.00512.55182.55182.5518
H31.08552.55181.79261.7926
H41.08552.55181.79261.7926
H51.08552.55181.79261.7926

picture of methyl bromide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Br2 C1 H3 107.557 Br2 C1 H4 107.557
Br2 C1 H5 107.557 H3 C1 H4 111.316
H3 C1 H5 111.316 H4 C1 H5 111.316
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.755      
2 Br 0.022      
3 H 0.244      
4 H 0.244      
5 H 0.244      


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 -1.832 1.832
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.644 0.000 0.000
y 0.000 -25.644 0.000
z 0.000 0.000 -22.269
Traceless
 xyz
x -1.687 0.000 0.000
y 0.000 -1.687 0.000
z 0.000 0.000 3.375
Polar
3z2-r26.750
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 1.971 0.000 0.000
y 0.000 1.971 0.000
z 0.000 0.000 5.060


<r2> (average value of r2) Å2
<r2> 50.737
(<r2>)1/2 7.123