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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: mPW1PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at mPW1PW91/6-31G*
 hartrees
Energy at 0K-490.429479
Energy at 298.15K 
HF Energy-490.429479
Nuclear repulsion energy117.941718
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 mPW1PW91/6-31G*
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 2331 2211 76.59 141.97 0.11 0.20
2 A1 997 945 171.52 18.92 0.61 0.75
3 A1 882 836 41.29 5.45 0.25 0.40
4 A1 318 301 17.54 0.71 0.74 0.85
5 A2 748 709 0.00 14.58 0.75 0.86
6 B1 2340 2219 208.39 39.88 0.75 0.86
7 B1 726 688 140.30 5.16 0.75 0.86
8 B2 1040 986 318.93 1.84 0.75 0.86
9 B2 921 873 1.38 9.29 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5150.8 cm-1
Scaled (by 0.9483) Zero Point Vibrational Energy (zpe) 4884.5 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 mPW1PW91/6-31G*
ABC
0.81161 0.25294 0.20747

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.448
F2 0.000 1.293 -0.488
F3 0.000 -1.293 -0.488
H4 1.236 0.000 1.257
H5 -1.236 0.000 1.257

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.59691.59691.47731.4773
F21.59692.58682.49952.4995
F31.59692.58682.49952.4995
H41.47732.49952.49952.4725
H51.47732.49952.49952.4725

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 108.180 F2 Si1 H4 108.729
F2 Si1 H5 108.729 F3 Si1 H4 108.729
F3 Si1 H5 108.729 H4 Si1 H5 113.613
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.971      
2 F -0.382      
3 F -0.382      
4 H -0.103      
5 H -0.103      


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 1.477 1.477
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.531 0.000 0.000
y 0.000 -25.618 0.000
z 0.000 0.000 -22.564
Traceless
 xyz
x 1.560 0.000 0.000
y 0.000 -3.070 0.000
z 0.000 0.000 1.510
Polar
3z2-r23.021
x2-y23.087
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.049 0.000 0.000
y 0.000 2.624 0.000
z 0.000 0.000 2.792


<r2> (average value of r2) Å2
<r2> 58.157
(<r2>)1/2 7.626