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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: PBE1PBE/TZVP

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/TZVP
 hartrees
Energy at 0K-490.260562
Energy at 298.15K 
HF Energy-490.260562
Nuclear repulsion energy117.179211
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/TZVP
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 2286 2194 51.10 187.63 0.11 0.19
2 A1 960 922 130.08 12.93 0.68 0.81
3 A1 847 812 78.27 5.10 0.19 0.32
4 A1 302 290 19.61 1.10 0.73 0.85
5 A2 709 681 0.00 18.17 0.75 0.86
6 B1 2303 2210 136.04 41.11 0.75 0.86
7 B1 697 669 136.76 5.77 0.75 0.86
8 B2 956 917 326.98 1.10 0.75 0.86
9 B2 880 845 0.00 10.68 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4970.4 cm-1
Scaled (by 0.9596) Zero Point Vibrational Energy (zpe) 4769.6 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 PBE1PBE/TZVP
ABC
0.79410 0.25076 0.20518

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/TZVP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.457
F2 0.000 1.299 -0.494
F3 0.000 -1.299 -0.494
H4 1.250 0.000 1.247
H5 -1.250 0.000 1.247

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.60971.60971.47871.4787
F21.60972.59722.50632.5063
F31.60972.59722.50632.5063
H41.47872.50632.50632.4996
H51.47872.50632.50632.4996

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.559 F2 Si1 H4 108.411
F2 Si1 H5 108.411 F3 Si1 H4 108.411
F3 Si1 H5 108.411 H4 Si1 H5 115.380
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/TZVP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.819      
2 F -0.318      
3 F -0.318      
4 H -0.091      
5 H -0.091      


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 1.832 1.832
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.808 0.000 0.000
y 0.000 -26.789 0.000
z 0.000 0.000 -23.078
Traceless
 xyz
x 2.126 0.000 0.000
y 0.000 -3.846 0.000
z 0.000 0.000 1.720
Polar
3z2-r23.440
x2-y23.981
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.503 0.000 0.000
y 0.000 3.017 0.000
z 0.000 0.000 3.191


<r2> (average value of r2) Å2
<r2> 59.042
(<r2>)1/2 7.684