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All results from a given calculation for CH3SiH3 (methyl silane)

using model chemistry: B3PW91/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3 1A1
Energy calculated at B3PW91/6-311G*
 hartrees
Energy at 0K-331.176020
Energy at 298.15K-331.170785
Nuclear repulsion energy62.635718
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 B3PW91/6-311G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3042 2929 6.88      
2 A1 2215 2133 68.48      
3 A1 1316 1267 21.00      
4 A1 940 905 231.16      
5 A1 701 675 9.30      
6 A2 190 183 0.00      
7 E 3122 3005 10.02      
7 E 3122 3005 10.02      
8 E 2215 2132 144.61      
8 E 2215 2132 144.63      
9 E 1481 1426 6.47      
9 E 1481 1426 6.47      
10 E 957 921 42.28      
10 E 957 921 42.28      
11 E 897 864 75.27      
11 E 897 864 75.27      
12 E 523 503 10.39      
12 E 523 503 10.39      

Unscaled Zero Point Vibrational Energy (zpe) 13397.0 cm-1
Scaled (by 0.9627) Zero Point Vibrational Energy (zpe) 12897.2 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 B3PW91/6-311G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-311G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.244
Si2 0.000 0.000 0.635
H3 0.000 -1.020 -1.640
H4 -0.883 0.510 -1.640
H5 0.883 0.510 -1.640
H6 0.000 1.393 1.163
H7 -1.207 -0.697 1.163
H8 1.207 -0.697 1.163

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.87941.09371.09371.09372.78152.78152.7815
Si21.87942.49322.49322.49321.49011.49011.4901
H31.09372.49321.76601.76603.69873.06893.0689
H41.09372.49321.76601.76603.06893.06893.6987
H51.09372.49321.76601.76603.06893.69873.0689
H62.78151.49013.69873.06893.06892.41362.4136
H72.78151.49013.06893.06893.69872.41362.4136
H82.78151.49013.06893.69873.06892.41362.4136

picture of methyl silane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 Si2 H6 110.749 C1 Si2 H7 110.749
C1 Si2 H8 110.749 Si2 C1 H3 111.216
Si2 C1 H4 111.216 Si2 C1 H5 111.216
H3 C1 H4 107.671 H3 C1 H5 107.671
H4 C1 H5 107.671 H6 Si2 H7 108.163
H6 Si2 H8 108.163 H7 Si2 H8 108.163
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-311G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.991      
2 Si 0.459      
3 H 0.248      
4 H 0.248      
5 H 0.248      
6 H -0.071      
7 H -0.071      
8 H -0.071      


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 -0.792 0.792
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.993 0.000 0.000
y 0.000 -22.993 0.000
z 0.000 0.000 -23.267
Traceless
 xyz
x 0.137 0.000 0.000
y 0.000 0.137 0.000
z 0.000 0.000 -0.274
Polar
3z2-r2-0.548
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 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 50.425
(<r2>)1/2 7.101