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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: PBE1PBE/6-31G(2df,p)

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/6-31G(2df,p)
 hartrees
Energy at 0K-490.177776
Energy at 298.15K 
HF Energy-490.177776
Nuclear repulsion energy118.807278
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/6-31G(2df,p)
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 2279 2181 56.09 136.24 0.10 0.18
2 A1 982 940 132.56 9.74 0.61 0.76
3 A1 877 840 42.25 5.22 0.16 0.28
4 A1 319 306 15.50 0.46 0.74 0.85
5 A2 728 697 0.00 8.74 0.75 0.86
6 B1 2285 2187 144.78 31.38 0.75 0.86
7 B1 710 680 122.29 3.80 0.75 0.86
8 B2 1008 964 254.33 0.02 0.75 0.86
9 B2 902 863 6.86 5.11 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5045.0 cm-1
Scaled (by 0.957) Zero Point Vibrational Energy (zpe) 4828.1 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/6-31G(2df,p)
ABC
0.82052 0.25713 0.21100

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/6-31G(2df,p)

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.445
F2 0.000 1.282 -0.485
F3 0.000 -1.282 -0.485
H4 1.241 0.000 1.248
H5 -1.241 0.000 1.248

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.58391.58391.47821.4782
F21.58392.56412.48722.4872
F31.58392.56412.48722.4872
H41.47822.48722.48722.4827
H51.47822.48722.48722.4827

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 108.085 F2 Si1 H4 108.590
F2 Si1 H5 108.590 F3 Si1 H4 108.590
F3 Si1 H5 108.590 H4 Si1 H5 114.234
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.401      
2 F -0.207      
3 F -0.207      
4 H 0.007      
5 H 0.007      


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 1.279 1.279
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.529 0.000 0.000
y 0.000 -25.206 0.000
z 0.000 0.000 -22.598
Traceless
 xyz
x 1.373 0.000 0.000
y 0.000 -2.643 0.000
z 0.000 0.000 1.270
Polar
3z2-r22.539
x2-y22.677
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.442 0.000 0.000
y 0.000 3.088 0.000
z 0.000 0.000 3.170


<r2> (average value of r2) Å2
<r2> 57.431
(<r2>)1/2 7.578