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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: PBE1PBE/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBE1PBE/3-21G
 hartrees
Energy at 0K-487.658897
Energy at 298.15K 
HF Energy-487.658897
Nuclear repulsion energy118.300460
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 PBE1PBE/3-21G
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 2351 2258 74.02 123.90 0.11 0.20
2 A1 1004 965 202.38 16.50 0.48 0.65
3 A1 922 885 2.44 8.23 0.58 0.74
4 A1 335 322 18.69 0.77 0.75 0.86
5 A2 774 744 0.00 14.36 0.75 0.86
6 B1 2355 2262 198.58 32.93 0.75 0.86
7 B1 748 719 156.41 5.39 0.75 0.86
8 B2 1115 1071 287.25 1.43 0.75 0.86
9 B2 957 919 14.45 9.32 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5280.9 cm-1
Scaled (by 0.9604) Zero Point Vibrational Energy (zpe) 5071.8 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 PBE1PBE/3-21G
ABC
0.79724 0.25786 0.20965

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.453
F2 0.000 1.281 -0.494
F3 0.000 -1.281 -0.494
H4 1.231 0.000 1.272
H5 -1.231 0.000 1.272

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.59281.59281.47861.4786
F21.59282.56132.50472.5047
F31.59282.56132.50472.5047
H41.47862.50472.50472.4626
H51.47862.50472.50472.4626

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.038 F2 Si1 H4 109.219
F2 Si1 H5 109.219 F3 Si1 H4 109.219
F3 Si1 H5 109.219 H4 Si1 H5 112.765
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.856      
2 F -0.304      
3 F -0.304      
4 H -0.124      
5 H -0.124      


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 1.325 1.325
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.667 0.000 0.000
y 0.000 -25.455 0.000
z 0.000 0.000 -22.811
Traceless
 xyz
x 1.466 0.000 0.000
y 0.000 -2.716 0.000
z 0.000 0.000 1.250
Polar
3z2-r22.501
x2-y22.788
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.662 0.000 0.000
y 0.000 2.287 0.000
z 0.000 0.000 2.459


<r2> (average value of r2) Å2
<r2> 57.821
(<r2>)1/2 7.604