## SiH3-SiH3

 H3 H8 H7 \ | / H5 - SI1 - SI2 / \ H4 H6
Tell me about the atomic charges, dipole moment, bond lengths, angles, bond orders,
molecular orbital energies, or total energy.
Tell me about the best Lewis structure.

## Atomic Charges and Dipole Moment

SI1 charge= 0.312
SI2 charge= 0.325
H3 charge=-0.103
H4 charge=-0.105
H5 charge=-0.105
H6 charge=-0.107
H7 charge=-0.107
H8 charge=-0.108
with a dipole moment of 0.00128 Debye

## Bond Lengths:

between SI1 and SI2: distance=2.376 ang___ between SI1 and H3: distance=1.507 ang___
between SI1 and H4: distance=1.507 ang___ between SI1 and H5: distance=1.508 ang___
between SI2 and H6: distance=1.507 ang___ between SI2 and H7: distance=1.507 ang___
between SI2 and H8: distance=1.507 ang___

## Bond Angles:

for H3-SI1-SI2: angle=110.3 deg___ for H4-SI1-SI2: angle=110.3 deg___
for H5-SI1-SI2: angle=110.4 deg___ for H6-SI2-SI1: angle=110.3 deg___
for H7-SI2-SI1: angle=110.4 deg___ for H8-SI2-SI1: angle=110.3 deg___

## Bond Orders (Mulliken):

between SI1 and SI2: order=0.952___ between SI1 and H3: order=0.924___
between SI1 and H4: order=0.924___ between SI1 and H5: order=0.925___
between SI2 and H6: order=0.924___ between SI2 and H7: order=0.924___
between SI2 and H8: order=0.924___

## Best Lewis Structure

The Lewis structure that is closest to your structure is determined. The hybridization of the atoms in this idealized Lewis structure is given in the table below.

### Hybridization in the Best Lewis Structure

1. A bonding orbital for Si1-Si2 with 1.9727 electrons
__has 50.00% Si 1 character in a sp2.97 hybrid
__has 50.00% Si 2 character in a sp2.97 hybrid

2. A bonding orbital for Si1-H3 with 1.9882 electrons
__has 41.35% Si 1 character in a sp2.95 hybrid
__has 58.65% H 3 character in a s orbital

3. A bonding orbital for Si1-H4 with 1.9882 electrons
__has 41.34% Si 1 character in a sp2.95 hybrid
__has 58.66% H 4 character in a s orbital

4. A bonding orbital for Si1-H5 with 1.9882 electrons
__has 41.35% Si 1 character in a sp2.95 hybrid
__has 58.65% H 5 character in a s orbital

5. A bonding orbital for Si2-H6 with 1.9882 electrons
__has 41.35% Si 2 character in a sp2.95 hybrid
__has 58.65% H 6 character in a s orbital

6. A bonding orbital for Si2-H7 with 1.9882 electrons
__has 41.35% Si 2 character in a sp2.95 hybrid
__has 58.65% H 7 character in a s orbital

7. A bonding orbital for Si2-H8 with 1.9882 electrons
__has 41.34% Si 2 character in a sp2.95 hybrid
__has 58.66% H 8 character in a s orbital

-With core pairs on:Si 1 Si 1 Si 1 Si 1 Si 1 Si 2 Si 2 Si 2 Si 2 Si 2 -

#### Donor Acceptor Interactions in the Best Lewis Structure

The localized orbitals in your best Lewis structure can interact strongly. A filled bonding or lone pair orbital can act as a donor and an empty or filled bonding, antibonding, or lone pair orbital can act as an acceptor. These interactions can strengthen and weaken bonds. For example, a lone pair donor->antibonding acceptor orbital interaction will weaken the bond associated with the antibonding orbital. Conversly, an interaction with a bonding pair as the acceptor will strengthen the bond. Strong electron delocalization in your best Lewis structure will also show up as donor-acceptor interactions.
Interactions greater than 20 kJ/mol for bonding and lone pair orbitals are listed below.

## Molecular Orbital Energies

The orbital energies are given in eV, where 1 eV=96.49 kJ/mol. Orbitals with very low energy are core 1s orbitals. More antibonding orbitals than you might expect are sometimes listed, because d orbitals are always included for heavy atoms and p orbitals are included for H atoms. Up spins are shown with a ^ and down spins are shown as v.

21 ----- 0.823

20 ----- -0.283 19 ----- -0.291

18 ----- -0.532

17 -^-v- -7.275

16 -^-v- -8.173 15 -^-v- -8.177

14 -^-v- -8.811 13 -^-v- -8.815

12 -^-v- -12.42

11 -^-v- -13.96

10 -^-v- -94.13
9 -^-v- -94.14
8 -^-v- -94.16 7 -^-v- -94.16 6 -^-v- -94.16 5 -^-v- -94.16

4 -^-v- -136.5 3 -^-v- -136.5

2 -^-v- -1771. 1 -^-v- -1771.

## Total Electronic Energy

The total electronic energy is a very large number, so by convention the units are given in atomic units, that is Hartrees (H). One Hartree is 2625.5 kJ/mol. The energy reference is for totally dissociated atoms. In other words, the reference state is a gas consisting of nuclei and electrons all at infinite distance from each other. The electronic energy includes all electric interactions and the kinetic energy of the electrons. This energy does not include translation, rotation, or vibration of the the molecule.

Total electronic energy = -582.6324572383 Hartrees