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 CH3MgBr (Methyl Magnesium Bromide)

using model chemistry: B1B95/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B1B95/3-21G*
 hartrees
Energy at 0K-2801.075376
Energy at 298.15K 
HF Energy-2801.075376
Nuclear repulsion energy168.421450
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 B1B95/3-21G*
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 3048 2910 11.75 90.68 0.00 0.00
2 A1 1246 1189 0.30 47.49 0.05 0.09
3 A1 647 618 61.60 11.23 0.05 0.10
4 A1 318 304 12.07 16.68 0.17 0.29
5 E 3134 2992 10.07 111.74 0.75 0.86
5 E 3134 2992 10.07 111.74 0.75 0.86
6 E 1534 1465 0.02 5.78 0.75 0.86
6 E 1534 1465 0.02 5.78 0.75 0.86
7 E 659 629 100.38 2.53 0.75 0.86
7 E 659 629 100.38 2.53 0.75 0.86
8 E 126 120 22.07 0.27 0.75 0.86
8 E 126 120 22.07 0.27 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 8080.6 cm-1
Scaled (by 0.9549) Zero Point Vibrational Energy (zpe) 7716.2 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 B1B95/3-21G*
ABC
5.32039 0.05609 0.05609

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/3-21G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -3.156
Mg2 0.000 0.000 -1.086
Br3 0.000 0.000 1.218
H4 0.000 1.024 -3.547
H5 0.887 -0.512 -3.547
H6 -0.887 -0.512 -3.547

Atom - Atom Distances (Å)
  C1 Mg2 Br3 H4 H5 H6
C12.06994.37381.09571.09571.0957
Mg22.06992.30392.66492.66492.6649
Br34.37382.30394.87314.87314.8731
H41.09572.66494.87311.77311.7731
H51.09572.66494.87311.77311.7731
H61.09572.66494.87311.77311.7731

picture of Methyl Magnesium Bromide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 Mg2 Br3 180.000 Mg2 C1 H4 110.882
Mg2 C1 H5 110.882 Mg2 C1 H6 110.882
H4 C1 H5 108.024 H4 C1 H6 108.024
H5 C1 H6 108.024
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -1.003      
2 Mg 0.693      
3 Br -0.330      
4 H 0.213      
5 H 0.213      
6 H 0.213      


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 -1.812 1.812
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -33.952 0.000 0.000
y 0.000 -33.952 0.000
z 0.000 0.000 -41.268
Traceless
 xyz
x 3.658 0.000 0.000
y 0.000 3.658 0.000
z 0.000 0.000 -7.317
Polar
3z2-r2-14.633
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 5.867 0.000 0.000
y 0.000 5.867 0.000
z 0.000 0.000 9.812


<r2> (average value of r2) Å2
<r2> 189.434
(<r2>)1/2 13.763