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All results from a given calculation for SiH3Br (bromosilane)

using model chemistry: PBE1PBE/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 PBE1PBE/3-21G*
 hartrees
Energy at 0K-2851.457112
Energy at 298.15K-2851.463272
HF Energy-2851.457112
Nuclear repulsion energy152.548722
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 PBE1PBE/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 2291 2199 69.15      
2 A1 974 935 345.74      
3 A1 468 449 33.93      
4 E 2305 2212 111.07      
4 E 2305 2212 111.07      
5 E 950 912 54.38      
5 E 950 912 54.38      
6 E 663 637 26.90      
6 E 663 637 26.90      

Unscaled Zero Point Vibrational Energy (zpe) 5784.8 cm-1
Scaled (by 0.9598) Zero Point Vibrational Energy (zpe) 5552.3 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 PBE1PBE/3-21G*
ABC
2.83663 0.14681 0.14681

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/3-21G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 -1.444
Br2 0.000 0.000 0.743
H3 0.000 1.402 -1.932
H4 1.214 -0.701 -1.932
H5 -1.214 -0.701 -1.932

Atom - Atom Distances (Å)
  Si1 Br2 H3 H4 H5
Si12.18771.48431.48431.4843
Br22.18773.02033.02033.0203
H31.48433.02032.42832.4283
H41.48433.02032.42832.4283
H51.48433.02032.42832.4283

picture of bromosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Br2 Si1 H3 109.174 Br2 Si1 H4 109.174
Br2 Si1 H5 109.174 H3 Si1 H4 109.767
H3 Si1 H5 109.767 H4 Si1 H5 109.767
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.402      
2 Br -0.269      
3 H -0.044      
4 H -0.044      
5 H -0.044      


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 -1.040 1.040
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -33.516 0.000 0.000
y 0.000 -33.516 0.000
z 0.000 0.000 -30.968
Traceless
 xyz
x -1.274 0.000 0.000
y 0.000 -1.274 0.000
z 0.000 0.000 2.548
Polar
3z2-r25.095
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 4.336 0.000 0.000
y 0.000 4.336 0.000
z 0.000 0.000 6.792


<r2> (average value of r2) Å2
<r2> 86.042
(<r2>)1/2 9.276