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

using model chemistry: mPW1PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3 1A1
Energy calculated at mPW1PW91/6-31G*
 hartrees
Energy at 0K-331.186062
Energy at 298.15K-331.180803
Nuclear repulsion energy62.614566
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 mPW1PW91/6-31G*
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 3082 2923 3.96      
2 A1 2254 2138 77.06      
3 A1 1334 1265 19.05      
4 A1 945 896 219.47      
5 A1 703 667 7.61      
6 A2 195 185 0.00      
7 E 3170 3006 7.02      
7 E 3170 3006 7.02      
8 E 2258 2141 183.45      
8 E 2258 2141 183.47      
9 E 1499 1421 4.65      
9 E 1499 1421 4.65      
10 E 959 910 41.10      
10 E 959 910 41.10      
11 E 905 858 75.60      
11 E 905 858 75.59      
12 E 521 494 8.45      
12 E 521 494 8.45      

Unscaled Zero Point Vibrational Energy (zpe) 13567.6 cm-1
Scaled (by 0.9483) Zero Point Vibrational Energy (zpe) 12866.1 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 mPW1PW91/6-31G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.246
Si2 0.000 0.000 0.635
H3 0.000 -1.021 -1.638
H4 -0.885 0.511 -1.638
H5 0.885 0.511 -1.638
H6 0.000 1.391 1.166
H7 -1.205 -0.696 1.166
H8 1.205 -0.696 1.166

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.88171.09391.09391.09392.78462.78462.7846
Si21.88172.49212.49212.49211.48911.48911.4891
H31.09392.49211.76921.76923.69893.06893.0689
H41.09392.49211.76921.76923.06893.06893.6989
H51.09392.49211.76921.76923.06893.69893.0689
H62.78461.48913.69893.06893.06892.41002.4100
H72.78461.48913.06893.06893.69892.41002.4100
H82.78461.48913.06893.69893.06892.41002.4100

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 110.865 C1 Si2 H7 110.865
C1 Si2 H8 110.865 Si2 C1 H3 110.968
Si2 C1 H4 110.968 Si2 C1 H5 110.968
H3 C1 H4 107.933 H3 C1 H5 107.933
H4 C1 H5 107.933 H6 Si2 H7 108.043
H6 Si2 H8 108.043 H7 Si2 H8 108.043
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.758      
2 Si 0.378      
3 H 0.199      
4 H 0.199      
5 H 0.199      
6 H -0.073      
7 H -0.073      
8 H -0.073      


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 -0.841 0.841
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.658 0.000 0.000
y 0.000 -22.658 0.000
z 0.000 0.000 -22.735
Traceless
 xyz
x 0.038 0.000 0.000
y 0.000 0.038 0.000
z 0.000 0.000 -0.076
Polar
3z2-r2-0.153
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> 50.202
(<r2>)1/2 7.085