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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: BLYP/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at BLYP/STO-3G
 hartrees
Energy at 0K-484.037898
Energy at 298.15K 
HF Energy-484.037898
Nuclear repulsion energy114.444770
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 BLYP/STO-3G
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 2457 2273 53.55 73.01 0.13 0.23
2 A1 1066 986 113.91 17.72 0.72 0.84
3 A1 811 751 9.16 4.92 0.17 0.28
4 A1 283 262 8.91 1.59 0.75 0.86
5 A2 748 692 0.00 11.41 0.75 0.86
6 B1 2488 2302 92.13 44.50 0.75 0.86
7 B1 651 603 89.95 4.19 0.75 0.86
8 B2 1015 939 216.61 2.62 0.75 0.86
9 B2 861 797 4.56 6.36 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5189.7 cm-1
Scaled (by 0.9252) Zero Point Vibrational Energy (zpe) 4801.5 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 BLYP/STO-3G
ABC
0.75015 0.24066 0.19444

See section I.F.4 to change rotational constant units
Geometric Data calculated at BLYP/STO-3G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.472
F2 0.000 1.329 -0.514
F3 0.000 -1.329 -0.514
H4 1.202 0.000 1.318
H5 -1.202 0.000 1.318

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.65471.65471.47001.4700
F21.65472.65852.56272.5627
F31.65472.65852.56272.5627
H41.47002.56272.56272.4038
H51.47002.56272.56272.4038

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 106.891 F2 Si1 H4 110.054
F2 Si1 H5 110.054 F3 Si1 H4 110.054
F3 Si1 H5 110.054 H4 Si1 H5 109.695
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.719      
2 F -0.213      
3 F -0.213      
4 H -0.146      
5 H -0.146      


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 0.529 0.529
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.623 0.000 0.000
y 0.000 -22.195 0.000
z 0.000 0.000 -21.048
Traceless
 xyz
x 0.998 0.000 0.000
y 0.000 -1.360 0.000
z 0.000 0.000 0.362
Polar
3z2-r20.724
x2-y21.572
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.505 0.000 0.000
y 0.000 1.797 0.000
z 0.000 0.000 1.682


<r2> (average value of r2) Å2
<r2> 59.332
(<r2>)1/2 7.703