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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B3PW91/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B3PW91/Def2TZVPP
 hartrees
Energy at 0K-490.501550
Energy at 298.15K 
HF Energy-490.501550
Nuclear repulsion energy118.542198
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 B3PW91/Def2TZVPP
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 2278 2278 53.47 187.53 0.08 0.16
2 A1 979 979 121.80 7.45 0.70 0.82
3 A1 863 863 67.91 5.07 0.16 0.28
4 A1 315 315 17.11 0.61 0.73 0.84
5 A2 727 727 0.00 9.42 0.75 0.86
6 B1 2290 2290 141.88 34.18 0.75 0.86
7 B1 707 707 127.20 3.78 0.75 0.86
8 B2 976 976 290.28 0.03 0.75 0.86
9 B2 895 895 0.22 5.58 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5014.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5014.6 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 B3PW91/Def2TZVPP
ABC
0.81839 0.25571 0.20985

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/Def2TZVPP

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.447
F2 0.000 1.286 -0.486
F3 0.000 -1.286 -0.486
H4 1.239 0.000 1.243
H5 -1.239 0.000 1.243

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.58871.58871.47291.4729
F21.58872.57182.48582.4858
F31.58872.57182.48582.4858
H41.47292.48582.48582.4785
H51.47292.48582.48582.4785

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 108.075 F2 Si1 H4 108.507
F2 Si1 H5 108.507 F3 Si1 H4 108.507
F3 Si1 H5 108.507 H4 Si1 H5 114.564
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/Def2TZVPP Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.751      
2 F -0.302      
3 F -0.302      
4 H -0.074      
5 H -0.074      


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 1.470 1.470
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.830 0.000 0.000
y 0.000 -26.048 0.000
z 0.000 0.000 -23.026
Traceless
 xyz
x 1.707 0.000 0.000
y 0.000 -3.120 0.000
z 0.000 0.000 1.413
Polar
3z2-r22.826
x2-y23.218
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.736 0.000 0.000
y 0.000 3.396 0.000
z 0.000 0.000 3.462


<r2> (average value of r2) Å2
<r2> 57.944
(<r2>)1/2 7.612