return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for Si2H6 (disilane)

using model chemistry: M06-2X/aug-cc-pV(T+d)Z

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D3D 1A1g
Energy calculated at M06-2X/aug-cc-pV(T+d)Z
 hartrees
Energy at 0K-582.542730
Energy at 298.15K-582.548756
HF Energy-582.542730
Nuclear repulsion energy91.102065
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 M06-2X/aug-cc-pV(T+d)Z
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 2230 2230 0.00      
2 A1g 920 920 0.00      
3 A1g 435 435 0.00      
4 A1u 126 126 0.00      
5 A2u 2221 2221 113.73      
6 A2u 839 839 524.55      
7 Eg 2228 2228 0.00      
7 Eg 2228 2228 0.00      
8 Eg 951 951 0.00      
8 Eg 951 951 0.00      
9 Eg 622 622 0.00      
9 Eg 621 621 0.00      
10 Eu 2237 2237 179.36      
10 Eu 2237 2237 180.36      
11 Eu 965 965 82.47      
11 Eu 965 965 82.56      
12 Eu 329 329 19.23      
12 Eu 328 328 19.96      

Unscaled Zero Point Vibrational Energy (zpe) 10716.0 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 10716.0 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 M06-2X/aug-cc-pV(T+d)Z
ABC
1.45196 0.16999 0.16999

See section I.F.4 to change rotational constant units
Geometric Data calculated at M06-2X/aug-cc-pV(T+d)Z

Point Group is D3d

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 1.168
Si2 0.000 0.000 -1.168
H3 0.000 1.386 1.679
H4 -1.200 -0.693 1.679
H5 1.200 -0.693 1.679
H6 0.000 -1.386 -1.679
H7 -1.200 0.693 -1.679
H8 1.200 0.693 -1.679

Atom - Atom Distances (Å)
  Si1 Si2 H3 H4 H5 H6 H7 H8
Si12.33571.47701.47701.47703.16633.16633.1663
Si22.33573.16633.16633.16631.47701.47701.4770
H31.47703.16632.40002.40004.35423.63303.6330
H41.47703.16632.40002.40003.63303.63304.3542
H51.47703.16632.40002.40003.63304.35423.6330
H63.16631.47704.35423.63303.63302.40002.4000
H73.16631.47703.63303.63304.35422.40002.4000
H83.16631.47703.63304.35423.63302.40002.4000

picture of disilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Si1 Si2 H6 110.256 Si1 Si2 H7 110.256
Si1 Si2 H8 110.256 Si2 Si1 H3 110.256
Si2 Si1 H4 110.256 Si2 Si1 H5 110.256
H3 Si1 H4 108.675 H3 Si1 H5 108.675
H4 Si1 H5 108.675 H6 Si2 H7 108.675
H6 Si2 H8 108.675 H7 Si2 H8 108.675
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at M06-2X/aug-cc-pV(T+d)Z Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.458      
2 Si 0.458      
3 H -0.153      
4 H -0.153      
5 H -0.153      
6 H -0.153      
7 H -0.153      
8 H -0.153      


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 -31.162 0.000 0.000
y 0.000 -31.162 0.000
z 0.000 0.000 -32.001
Traceless
 xyz
x 0.419 0.000 0.000
y 0.000 0.419 0.000
z 0.000 0.000 -0.839
Polar
3z2-r2-1.678
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 8.176 0.000 0.000
y 0.000 8.172 0.015
z 0.000 0.015 11.014


<r2> (average value of r2) Å2
<r2> 86.264
(<r2>)1/2 9.288