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

using model chemistry: B3PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3 1A1
Energy calculated at B3PW91/6-31G*
 hartrees
Energy at 0K-331.146050
Energy at 298.15K-331.140802
Nuclear repulsion energy62.520807
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 B3PW91/6-31G*
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 3064 2931 4.35      
2 A1 2239 2142 77.89      
3 A1 1326 1269 17.82      
4 A1 941 900 217.87      
5 A1 697 667 7.75      
6 A2 195 186 0.00      
7 E 3150 3013 7.83      
7 E 3150 3013 7.83      
8 E 2243 2146 184.12      
8 E 2243 2146 184.13      
9 E 1491 1427 4.40      
9 E 1491 1427 4.40      
10 E 955 914 40.79      
10 E 955 914 40.79      
11 E 901 862 74.14      
11 E 901 862 74.14      
12 E 519 497 8.26      
12 E 519 497 8.26      

Unscaled Zero Point Vibrational Energy (zpe) 13489.4 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 12905.3 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 B3PW91/6-31G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.248
Si2 0.000 0.000 0.636
H3 0.000 -1.023 -1.641
H4 -0.886 0.511 -1.641
H5 0.886 0.511 -1.641
H6 0.000 1.393 1.168
H7 -1.207 -0.697 1.168
H8 1.207 -0.697 1.168

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.88461.09551.09551.09552.78902.78902.7890
Si21.88462.49612.49612.49611.49111.49111.4911
H31.09552.49611.77181.77183.70463.07393.0739
H41.09552.49611.77181.77183.07393.07393.7046
H51.09552.49611.77181.77183.07393.70463.0739
H62.78901.49113.70463.07393.07392.41302.4130
H72.78901.49113.07393.07393.70462.41302.4130
H82.78901.49113.07393.70463.07392.41302.4130

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 110.883 C1 Si2 H7 110.883
C1 Si2 H8 110.883 Si2 C1 H3 110.977
Si2 C1 H4 110.977 Si2 C1 H5 110.977
H3 C1 H4 107.924 H3 C1 H5 107.924
H4 C1 H5 107.924 H6 Si2 H7 108.023
H6 Si2 H8 108.023 H7 Si2 H8 108.023
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.744     -0.496
2 Si 0.379     0.663
3 H 0.196     0.120
4 H 0.196     0.121
5 H 0.196     0.121
6 H -0.074     -0.177
7 H -0.074     -0.176
8 H -0.074     -0.176


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 -0.849 0.849
CHELPG        
AIM        
ESP -0.002 -0.002 0.815 0.815


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.660 0.000 0.000
y 0.000 -22.660 0.000
z 0.000 0.000 -22.731
Traceless
 xyz
x 0.035 0.000 0.000
y 0.000 0.035 0.000
z 0.000 0.000 -0.070
Polar
3z2-r2-0.141
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> 50.313
(<r2>)1/2 7.093