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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B2PLYP/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/6-31G
 hartrees
Energy at 0K-490.040302
Energy at 298.15K 
HF Energy-489.937282
Nuclear repulsion energy112.491968
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
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 2266 2266 74.28 178.79 0.11 0.19
2 A1 949 949 163.55 27.34 0.66 0.80
3 A1 785 785 34.30 8.44 0.16 0.28
4 A1 276 276 25.37 1.75 0.75 0.86
5 A2 703 703 0.00 23.72 0.75 0.86
6 B1 2293 2293 172.06 53.18 0.75 0.86
7 B1 684 684 136.30 10.25 0.75 0.86
8 B2 975 975 270.17 7.70 0.75 0.86
9 B2 850 850 4.07 10.34 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 4890.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 4890.3 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 B2PLYP/6-31G
ABC
0.73126 0.23102 0.18806

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.484
F2 0.000 1.355 -0.518
F3 0.000 -1.355 -0.518
H4 1.258 0.000 1.277
H5 -1.258 0.000 1.277

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.68561.68561.48741.4874
F21.68562.71032.57752.5775
F31.68562.71032.57752.5775
H41.48742.57752.57752.5168
H51.48742.57752.57752.5168

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.024 F2 Si1 H4 108.485
F2 Si1 H5 108.485 F3 Si1 H4 108.485
F3 Si1 H5 108.485 H4 Si1 H5 115.560
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.259      
2 F -0.479      
3 F -0.479      
4 H -0.150      
5 H -0.150      


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 2.827 2.827
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -23.025 0.000 0.000
y 0.000 -29.077 0.000
z 0.000 0.000 -23.359
Traceless
 xyz
x 3.193 0.000 0.000
y 0.000 -5.885 0.000
z 0.000 0.000 2.692
Polar
3z2-r25.384
x2-y26.052
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.979 0.000 0.000
y 0.000 2.724 0.000
z 0.000 0.000 2.750


<r2> (average value of r2) Å2
<r2> 63.315
(<r2>)1/2 7.957