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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B2PLYP=FULLultrafine/6-31G*

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=FULLultrafine/6-31G*
 hartrees
Energy at 0K-490.194096
Energy at 298.15K 
HF Energy-490.050568
Nuclear repulsion energy117.789068
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=FULLultrafine/6-31G*
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 2355 2234 76.69 136.63 0.11 0.19
2 A1 1015 963 179.41 19.19 0.62 0.77
3 A1 883 837 44.90 5.48 0.21 0.35
4 A1 320 304 18.27 0.74 0.74 0.85
5 A2 760 721 0.00 14.41 0.75 0.86
6 B1 2365 2243 207.38 38.37 0.75 0.86
7 B1 735 698 147.34 5.07 0.75 0.86
8 B2 1049 995 337.37 2.57 0.75 0.86
9 B2 929 881 0.12 9.04 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5205.0 cm-1
Scaled (by 0.9487) Zero Point Vibrational Energy (zpe) 4938.0 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=FULLultrafine/6-31G*
ABC
0.81023 0.25217 0.20677

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULLultrafine/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.449
F2 0.000 1.296 -0.489
F3 0.000 -1.296 -0.489
H4 1.233 0.000 1.257
H5 -1.233 0.000 1.257

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.59981.59981.47371.4737
F21.59982.59132.49932.4993
F31.59982.59132.49932.4993
H41.47372.49932.49932.4653
H51.47372.49932.49932.4653

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 108.171 F2 Si1 H4 108.752
F2 Si1 H5 108.752 F3 Si1 H4 108.752
F3 Si1 H5 108.752 H4 Si1 H5 113.534
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP=FULLultrafine/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.027      
2 F -0.398      
3 F -0.398      
4 H -0.116      
5 H -0.116      


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 1.497 1.497
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.772 0.000 0.000
y 0.000 -25.852 0.000
z 0.000 0.000 -22.752
Traceless
 xyz
x 1.530 0.000 0.000
y 0.000 -3.090 0.000
z 0.000 0.000 1.560
Polar
3z2-r23.119
x2-y23.080
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.992 0.000 0.000
y 0.000 2.598 0.000
z 0.000 0.000 2.759


<r2> (average value of r2) Å2
<r2> 58.411
(<r2>)1/2 7.643