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

using model chemistry: MP2/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3 1A1
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-328.678019
Energy at 298.15K-328.672816
HF Energy-328.525708
Nuclear repulsion energy61.680818
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 MP2/3-21G
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 3087 2947 5.27      
2 A1 2198 2098 62.88      
3 A1 1412 1348 12.54      
4 A1 949 905 272.99      
5 A1 690 658 4.74      
6 A2 186 177 0.00      
7 E 3169 3025 7.96      
7 E 3169 3025 7.96      
8 E 2199 2099 155.10      
8 E 2199 2099 155.10      
9 E 1566 1494 5.39      
9 E 1566 1494 5.39      
10 E 979 935 41.72      
10 E 979 935 41.72      
11 E 961 917 87.89      
11 E 961 917 87.89      
12 E 538 513 18.38      
12 E 538 513 18.38      

Unscaled Zero Point Vibrational Energy (zpe) 13672.1 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 13050.0 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 MP2/3-21G
See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.278
Si2 0.000 0.000 0.651
H3 0.000 -1.025 -1.662
H4 -0.888 0.513 -1.662
H5 0.888 0.513 -1.662
H6 0.000 1.406 1.178
H7 -1.218 -0.703 1.178
H8 1.218 -0.703 1.178

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.92911.09511.09511.09512.83012.83012.8301
Si21.92912.53052.53052.53051.50181.50181.5018
H31.09512.53051.77611.77613.73903.10713.1071
H41.09512.53051.77611.77613.10713.10713.7390
H51.09512.53051.77611.77613.10713.73903.1071
H62.83011.50183.73903.10713.10712.43582.4358
H72.83011.50183.10713.10713.73902.43582.4358
H82.83011.50183.10713.73903.10712.43582.4358

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 110.535 C1 Si2 H7 110.535
C1 Si2 H8 110.535 Si2 C1 H3 110.543
Si2 C1 H4 110.543 Si2 C1 H5 110.543
H3 C1 H4 108.378 H3 C1 H5 108.378
H4 C1 H5 108.378 H6 Si2 H7 108.387
H6 Si2 H8 108.387 H7 Si2 H8 108.387
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at MP2/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.922     -0.658
2 Si 0.808     0.955
3 H 0.202     0.145
4 H 0.202     0.145
5 H 0.202     0.146
6 H -0.164     -0.245
7 H -0.164     -0.244
8 H -0.164     -0.244


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 -0.638 0.638
CHELPG        
AIM        
ESP 0.002 -0.003 -0.595 0.595


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -24.117 0.000 0.000
y 0.000 -24.117 0.000
z 0.000 0.000 -24.259
Traceless
 xyz
x 0.071 0.000 0.000
y 0.000 0.071 0.000
z 0.000 0.000 -0.142
Polar
3z2-r2-0.284
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 4.503 0.000 0.000
y 0.000 4.503 0.000
z 0.000 0.000 5.059


<r2> (average value of r2) Å2
<r2> 52.403
(<r2>)1/2 7.239