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All results from a given calculation for SiH3Br (bromosilane)

using model chemistry: PBEPBE/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 PBEPBE/3-21G
 hartrees
Energy at 0K-2850.983468
Energy at 298.15K-2850.989402
HF Energy-2850.983468
Nuclear repulsion energy143.454507
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 PBEPBE/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 2150 2130 54.52      
2 A1 885 877 266.41      
3 A1 364 361 20.55      
4 E 2178 2158 102.06      
4 E 2178 2158 102.07      
5 E 879 871 44.54      
5 E 879 871 44.54      
6 E 591 586 16.73      
6 E 591 586 16.73      

Unscaled Zero Point Vibrational Energy (zpe) 5347.9 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 5299.2 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 PBEPBE/3-21G
ABC
2.74360 0.12846 0.12846

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 -1.552
Br2 0.000 0.000 0.795
H3 0.000 1.426 -2.033
H4 1.235 -0.713 -2.033
H5 -1.235 -0.713 -2.033

Atom - Atom Distances (Å)
  Si1 Br2 H3 H4 H5
Si12.34671.50461.50461.5046
Br22.34673.16693.16693.1669
H31.50463.16692.46912.4691
H41.50463.16692.46912.4691
H51.50463.16692.46912.4691

picture of bromosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Br2 Si1 H3 108.655 Br2 Si1 H4 108.655
Br2 Si1 H5 108.655 H3 Si1 H4 110.275
H3 Si1 H5 110.275 H4 Si1 H5 110.275
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.381      
2 Br -0.224      
3 H -0.052      
4 H -0.052      
5 H -0.052      


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 -1.856 1.856
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -34.267 0.000 0.000
y 0.000 -34.267 0.000
z 0.000 0.000 -31.344
Traceless
 xyz
x -1.462 0.000 0.000
y 0.000 -1.462 0.000
z 0.000 0.000 2.923
Polar
3z2-r25.847
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 3.700 0.000 0.000
y 0.000 3.700 0.000
z 0.000 0.000 7.830


<r2> (average value of r2) Å2
<r2> 95.118
(<r2>)1/2 9.753