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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B2PLYP/3-21G

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/3-21G
 hartrees
Energy at 0K-487.521695
Energy at 298.15K 
HF Energy-487.424594
Nuclear repulsion energy115.552145
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/3-21G
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 2322 2322 88.28 147.73 0.10 0.18
2 A1 967 967 198.05 27.91 0.57 0.73
3 A1 872 872 6.21 9.80 0.37 0.54
4 A1 326 326 22.61 1.33 0.75 0.86
5 A2 770 770 0.00 21.77 0.75 0.86
6 B1 2326 2326 207.63 45.14 0.75 0.86
7 B1 740 740 167.43 7.95 0.75 0.86
8 B2 1079 1079 301.68 6.49 0.75 0.86
9 B2 936 936 1.04 10.22 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5169.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5169.3 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/3-21G
ABC
0.74116 0.24959 0.20022

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/3-21G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.478
F2 0.000 1.303 -0.516
F3 0.000 -1.303 -0.516
H4 1.229 0.000 1.300
H5 -1.229 0.000 1.300

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.63831.63831.47871.4787
F21.63832.60572.55022.5502
F31.63832.60572.55022.5502
H41.47872.55022.55022.4582
H51.47872.55022.55022.4582

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 105.354 F2 Si1 H4 109.699
F2 Si1 H5 109.699 F3 Si1 H4 109.699
F3 Si1 H5 109.699 H4 Si1 H5 112.448
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 1.233      
2 F -0.408      
3 F -0.408      
4 H -0.208      
5 H -0.208      


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 1.982 1.982
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -23.290 0.000 0.000
y 0.000 -27.105 0.000
z 0.000 0.000 -23.608
Traceless
 xyz
x 2.067 0.000 0.000
y 0.000 -3.656 0.000
z 0.000 0.000 1.589
Polar
3z2-r23.178
x2-y23.815
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.707 0.000 0.000
y 0.000 2.345 0.000
z 0.000 0.000 2.522


<r2> (average value of r2) Å2
<r2> 60.344
(<r2>)1/2 7.768