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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B2PLYP/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 B2PLYP/6-31G(2df,p)
 hartrees
Energy at 0K-490.254796
Energy at 298.15K 
HF Energy-490.074463
Nuclear repulsion energy118.743597
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 B2PLYP/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 2316 2212 57.73 130.18 0.10 0.18
2 A1 1008 963 136.63 9.54 0.64 0.78
3 A1 878 838 48.15 5.21 0.13 0.22
4 A1 323 309 15.98 0.49 0.73 0.85
5 A2 744 711 0.00 8.33 0.75 0.86
6 B1 2321 2217 148.11 29.93 0.75 0.86
7 B1 722 690 128.65 3.62 0.75 0.86
8 B2 1016 970 275.82 0.16 0.75 0.86
9 B2 916 874 1.55 5.05 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5121.9 cm-1
Scaled (by 0.955) Zero Point Vibrational Energy (zpe) 4891.4 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 B2PLYP/6-31G(2df,p)
ABC
0.82238 0.25642 0.21041

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/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 1.284 -0.485
F3 0.000 -1.284 -0.485
H4 1.232 0.000 1.246
H5 -1.232 0.000 1.246

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.58591.58591.46941.4694
F21.58592.56882.48252.4825
F31.58592.56882.48252.4825
H41.46942.48252.48252.4649
H51.46942.48252.48252.4649

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 108.164 F2 Si1 H4 108.627
F2 Si1 H5 108.627 F3 Si1 H4 108.627
F3 Si1 H5 108.627 H4 Si1 H5 114.020
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.485      
2 F -0.233      
3 F -0.233      
4 H -0.009      
5 H -0.009      


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 1.285 1.285
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.726 0.000 0.000
y 0.000 -25.387 0.000
z 0.000 0.000 -22.745
Traceless
 xyz
x 1.340 0.000 0.000
y 0.000 -2.652 0.000
z 0.000 0.000 1.312
Polar
3z2-r22.625
x2-y22.661
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.347 0.000 0.000
y 0.000 3.048 0.000
z 0.000 0.000 3.115


<r2> (average value of r2) Å2
<r2> 57.599
(<r2>)1/2 7.589