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

using model chemistry: B3LYP/CEP-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 B3LYP/CEP-31G*
 hartrees
Energy at 0K-13.128687
Energy at 298.15K-13.123420
Nuclear repulsion energy22.225082
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 B3LYP/CEP-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 3041 2937 12.46      
2 A1 2189 2114 65.06      
3 A1 1307 1262 23.48      
4 A1 937 905 207.01      
5 A1 690 666 9.50      
6 A2 181 175 0.00      
7 E 3118 3011 23.44      
7 E 3118 3011 23.46      
8 E 2197 2122 163.34      
8 E 2197 2122 163.33      
9 E 1475 1424 6.24      
9 E 1475 1424 6.24      
10 E 947 914 40.60      
10 E 947 914 40.60      
11 E 888 858 66.44      
11 E 888 858 66.45      
12 E 515 497 7.58      
12 E 515 497 7.59      

Unscaled Zero Point Vibrational Energy (zpe) 13311.9 cm-1
Scaled (by 0.9657) Zero Point Vibrational Energy (zpe) 12855.3 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 B3LYP/CEP-31G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.979
Si2 0.000 0.000 -0.920
H3 0.000 1.031 1.374
H4 -0.893 -0.516 1.374
H5 0.893 -0.516 1.374
H6 0.000 -1.403 -1.452
H7 -1.215 0.701 -1.452
H8 1.215 0.701 -1.452

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.89841.10431.10431.10432.80662.80662.8066
Si21.89842.51492.51492.51491.50031.50031.5003
H31.10432.51491.78581.78583.72983.09403.0940
H41.10432.51491.78581.78583.09403.09403.7298
H51.10432.51491.78581.78583.09403.72983.0940
H62.80661.50033.72983.09403.09402.42932.4293
H72.80661.50033.09403.09403.72982.42932.4293
H82.80661.50033.09403.72983.09402.42932.4293

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 110.795 C1 Si2 H7 110.795
C1 Si2 H8 110.795 Si2 C1 H3 110.984
Si2 C1 H4 110.984 Si2 C1 H5 110.984
H3 C1 H4 107.917 H3 C1 H5 107.917
H4 C1 H5 107.917 H6 Si2 H7 108.116
H6 Si2 H8 108.116 H7 Si2 H8 108.116
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/CEP-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.505      
2 Si -0.072      
3 H 0.175      
4 H 0.175      
5 H 0.175      
6 H 0.018      
7 H 0.018      
8 H 0.018      


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 0.681 0.681
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -21.359 0.000 0.000
y 0.000 -21.359 0.000
z 0.000 0.000 -22.224
Traceless
 xyz
x 0.432 0.000 0.000
y 0.000 0.432 0.000
z 0.000 0.000 -0.865
Polar
3z2-r2-1.730
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 4.418 0.000 0.000
y 0.000 4.418 -0.000
z 0.000 -0.000 5.401


<r2> (average value of r2) Å2
<r2> 41.818
(<r2>)1/2 6.467