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All results from a given calculation for Si2H6 (disilane)

using model chemistry: HF/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3D 1A1g
Energy calculated at HF/6-31G
 hartrees
Energy at 0K-581.215365
Energy at 298.15K-581.221371
HF Energy-581.215365
Nuclear repulsion energy89.883098
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/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 A1g 2267 2047 0.00      
2 A1g 967 873 0.00      
3 A1g 439 396 0.00      
4 A1u 124 112 0.00      
5 A2u 2251 2032 216.52      
6 A2u 898 810 679.54      
7 Eg 2260 2041 0.00      
7 Eg 2260 2041 0.00      
8 Eg 999 902 0.00      
8 Eg 999 902 0.00      
9 Eg 676 610 0.00      
9 Eg 676 610 0.00      
10 Eu 2271 2050 400.49      
10 Eu 2271 2050 400.49      
11 Eu 1011 913 137.24      
11 Eu 1011 913 137.24      
12 Eu 419 378 37.73      
12 Eu 419 378 37.73      

Unscaled Zero Point Vibrational Energy (zpe) 11108.3 cm-1
Scaled (by 0.9029) Zero Point Vibrational Energy (zpe) 10029.6 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/6-31G
ABC
1.42221 0.16506 0.16506

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/6-31G

Point Group is D3d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 1.185
Si2 0.000 0.000 -1.185
H3 0.000 1.400 1.705
H4 -1.212 -0.700 1.705
H5 1.212 -0.700 1.705
H6 0.000 -1.400 -1.705
H7 -1.212 0.700 -1.705
H8 1.212 0.700 -1.705

Atom - Atom Distances (Å)
  Si1 Si2 H3 H4 H5 H6 H7 H8
Si12.37071.49351.49351.49353.21183.21183.2118
Si22.37073.21183.21183.21181.49351.49351.4935
H31.49353.21182.42502.42504.41283.68673.6867
H41.49353.21182.42502.42503.68673.68674.4128
H51.49353.21182.42502.42503.68674.41283.6867
H63.21181.49354.41283.68673.68672.42502.4250
H73.21181.49353.68673.68674.41282.42502.4250
H83.21181.49353.68674.41283.68672.42502.4250

picture of disilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Si1 Si2 H6 110.372 Si1 Si2 H7 110.372
Si1 Si2 H8 110.372 Si2 Si1 H3 110.372
Si2 Si1 H4 110.372 Si2 Si1 H5 110.372
H3 Si1 H4 108.555 H3 Si1 H5 108.555
H4 Si1 H5 108.555 H6 Si2 H7 108.555
H6 Si2 H8 108.555 H7 Si2 H8 108.555
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.514      
2 Si 0.514      
3 H -0.171      
4 H -0.171      
5 H -0.171      
6 H -0.171      
7 H -0.171      
8 H -0.171      


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 0.000 0.000
CHELPG 0.000 0.000 0.000 0.000
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -32.825 0.000 0.000
y 0.000 -32.825 0.000
z 0.000 0.000 -34.139
Traceless
 xyz
x 0.657 0.000 0.000
y 0.000 0.657 0.000
z 0.000 0.000 -1.314
Polar
3z2-r2-2.627
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 6.467 0.000 0.000
y 0.000 6.467 0.000
z 0.000 0.000 8.888


<r2> (average value of r2) Å2
<r2> 89.326
(<r2>)1/2 9.451