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All results from a given calculation for Si2H6 (disilane)

using model chemistry: B1B95/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3D 1A1g
Energy calculated at B1B95/STO-3G
 hartrees
Energy at 0K-575.910316
Energy at 298.15K-575.916438
HF Energy-575.910316
Nuclear repulsion energy94.228189
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 B1B95/STO-3G
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 2674 2361 0.00      
2 A1g 1094 966 0.00      
3 A1g 562 496 0.00      
4 A1u 116 102 0.00      
5 A2u 2675 2362 16.71      
6 A2u 1012 893 524.21      
7 Eg 2725 2406 0.00      
7 Eg 2725 2406 0.00      
8 Eg 1127 995 0.00      
8 Eg 1127 995 0.00      
9 Eg 745 657 0.00      
9 Eg 745 657 0.00      
10 Eu 2731 2411 38.77      
10 Eu 2731 2411 38.70      
11 Eu 1133 1000 94.77      
11 Eu 1133 1000 94.75      
12 Eu 510 450 32.45      
12 Eu 510 450 32.44      

Unscaled Zero Point Vibrational Energy (zpe) 13034.9 cm-1
Scaled (by 0.883) Zero Point Vibrational Energy (zpe) 11509.8 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 B1B95/STO-3G
ABC
1.54054 0.18336 0.18336

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/STO-3G

Point Group is D3d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 1.120
Si2 0.000 0.000 -1.120
H3 0.000 1.345 1.640
H4 -1.165 -0.673 1.640
H5 1.165 -0.673 1.640
H6 0.000 -1.345 -1.640
H7 -1.165 0.673 -1.640
H8 1.165 0.673 -1.640

Atom - Atom Distances (Å)
  Si1 Si2 H3 H4 H5 H6 H7 H8
Si12.24011.44231.44231.44233.07073.07073.0707
Si22.24013.07073.07073.07071.44231.44231.4423
H31.44233.07072.33002.33004.24263.54563.5456
H41.44233.07072.33002.33003.54563.54564.2426
H51.44233.07072.33002.33003.54564.24263.5456
H63.07071.44234.24263.54563.54562.33002.3300
H73.07071.44233.54563.54564.24262.33002.3300
H83.07071.44233.54564.24263.54562.33002.3300

picture of disilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Si1 Si2 H6 111.140 Si1 Si2 H7 111.140
Si1 Si2 H8 111.140 Si2 Si1 H3 111.140
Si2 Si1 H4 111.140 Si2 Si1 H5 111.140
H3 Si1 H4 107.752 H3 Si1 H5 107.752
H4 Si1 H5 107.752 H6 Si2 H7 107.752
H6 Si2 H8 107.752 H7 Si2 H8 107.752
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.358      
2 Si 0.358      
3 H -0.119      
4 H -0.119      
5 H -0.119      
6 H -0.119      
7 H -0.119      
8 H -0.119      


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        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -27.462 0.000 0.000
y 0.000 -27.462 0.000
z 0.000 0.000 -28.523
Traceless
 xyz
x 0.531 0.000 0.000
y 0.000 0.531 0.000
z 0.000 0.000 -1.061
Polar
3z2-r2-2.122
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 2.889 0.000 0.000
y 0.000 2.889 -0.000
z 0.000 -0.000 4.002


<r2> (average value of r2) Å2
<r2> 79.501
(<r2>)1/2 8.916