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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B3LYP/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at B3LYP/CEP-121G
 hartrees
Energy at 0K-53.477707
Energy at 298.15K 
HF Energy-53.477707
Nuclear repulsion energy35.653780
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 B3LYP/CEP-121G
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 2224 2167 43.37 223.99 0.12 0.21
2 A1 905 882 138.60 22.01 0.69 0.82
3 A1 724 706 61.39 7.89 0.12 0.21
4 A1 253 246 24.74 2.08 0.74 0.85
5 A2 670 653 0.00 23.53 0.75 0.86
6 B1 2266 2208 104.70 60.10 0.75 0.86
7 B1 646 630 118.62 11.47 0.75 0.86
8 B2 900 877 232.84 9.56 0.75 0.86
9 B2 787 767 37.13 8.28 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4687.8 cm-1
Scaled (by 0.9745) Zero Point Vibrational Energy (zpe) 4568.3 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 B3LYP/CEP-121G
ABC
0.72189 0.22624 0.18467

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-121G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.490
F2 0.000 1.369 -0.521
F3 0.000 -1.369 -0.521
H4 1.277 0.000 1.262
H5 -1.277 0.000 1.262

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.70201.70201.49281.4928
F21.70202.73822.58602.5860
F31.70202.73822.58602.5860
H41.49282.58602.58602.5548
H51.49282.58602.58602.5548

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.106 F2 Si1 H4 107.904
F2 Si1 H5 107.904 F3 Si1 H4 107.904
F3 Si1 H5 107.904 H4 Si1 H5 117.674
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.103      
2 F -0.480      
3 F -0.480      
4 H -0.071      
5 H -0.071      


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 3.192 3.192
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -21.804 0.000 0.000
y 0.000 -28.934 0.000
z 0.000 0.000 -22.322
Traceless
 xyz
x 3.824 0.000 0.000
y 0.000 -6.871 0.000
z 0.000 0.000 3.047
Polar
3z2-r26.095
x2-y27.130
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.327 0.000 0.000
y 0.000 3.142 0.000
z 0.000 0.000 3.103


<r2> (average value of r2) Å2
<r2> 52.667
(<r2>)1/2 7.257