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

using model chemistry: HF/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3 1A1
Energy calculated at HF/3-21G
 hartrees
Energy at 0K-328.526121
Energy at 298.15K-328.520886
Nuclear repulsion energy62.136123
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 HF/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 3191 2890 9.37      
2 A1 2275 2060 85.00      
3 A1 1477 1338 21.82      
4 A1 1003 908 334.68      
5 A1 718 650 6.62      
6 A2 175 159 0.00      
7 E 3264 2956 10.11      
7 E 3264 2956 10.11      
8 E 2260 2046 205.57      
8 E 2260 2046 205.57      
9 E 1636 1481 7.79      
9 E 1636 1481 7.79      
10 E 1033 935 57.35      
10 E 1033 935 57.35      
11 E 999 905 104.65      
11 E 999 905 104.65      
12 E 573 519 25.60      
12 E 573 519 25.60      

Unscaled Zero Point Vibrational Energy (zpe) 14182.9 cm-1
Scaled (by 0.9056) Zero Point Vibrational Energy (zpe) 12844.0 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 HF/3-21G
See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.269
Si2 0.000 0.000 0.647
H3 0.000 -1.015 -1.653
H4 -0.879 0.508 -1.653
H5 0.879 0.508 -1.653
H6 0.000 1.394 1.172
H7 -1.207 -0.697 1.172
H8 1.207 -0.697 1.172

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.91641.08501.08501.08502.81192.81192.8119
Si21.91642.51372.51372.51371.49001.49001.4900
H31.08502.51371.75811.75813.71293.08873.0887
H41.08502.51371.75811.75813.08873.08873.7129
H51.08502.51371.75811.75813.08873.71293.0887
H62.81191.49003.71293.08873.08872.41492.4149
H72.81191.49003.08873.08873.71292.41492.4149
H82.81191.49003.08873.71293.08872.41492.4149

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 110.651 C1 Si2 H7 110.651
C1 Si2 H8 110.651 Si2 C1 H3 110.683
Si2 C1 H4 110.683 Si2 C1 H5 110.683
H3 C1 H4 108.233 H3 C1 H5 108.233
H4 C1 H5 108.233 H6 Si2 H7 108.266
H6 Si2 H8 108.266 H7 Si2 H8 108.266
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -1.044 -0.578   -0.719
2 Si 0.966 0.936   1.130
3 H 0.224 0.123   0.152
4 H 0.224 0.123   0.152
5 H 0.224 0.123   0.152
6 H -0.198 -0.243   -0.288
7 H -0.198 -0.242   -0.289
8 H -0.198 -0.242   -0.289


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 -0.633 0.633
CHELPG 0.000 -0.000 -0.598 0.598
AIM        
ESP -0.003 0.000 0.608 0.608


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -24.051 0.000 0.000
y 0.000 -24.051 0.000
z 0.000 0.000 -24.285
Traceless
 xyz
x 0.117 0.000 0.000
y 0.000 0.117 0.000
z 0.000 0.000 -0.234
Polar
3z2-r2-0.469
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 4.441 0.000 0.000
y 0.000 4.441 0.000
z 0.000 0.000 4.939


<r2> (average value of r2) Å2
<r2> 51.839
(<r2>)1/2 7.200