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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-487.665230
Energy at 298.15K 
HF Energy-487.561476
Nuclear repulsion energy118.365016
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 2391 2391 75.93 117.56 0.11 0.19
2 A1 1024 1024 211.99 17.62 0.53 0.69
3 A1 931 931 6.97 7.24 0.49 0.65
4 A1 342 342 19.75 0.83 0.75 0.86
5 A2 794 794 0.00 14.24 0.75 0.86
6 B1 2393 2393 200.66 32.20 0.75 0.86
7 B1 763 763 167.18 5.24 0.75 0.86
8 B2 1129 1129 315.43 2.00 0.75 0.86
9 B2 972 972 10.60 9.26 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5369.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5369.4 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
0.79937 0.25794 0.20965

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 0.453
F2 0.000 1.281 -0.494
F3 0.000 -1.281 -0.494
H4 1.224 0.000 1.271
H5 -1.224 0.000 1.271

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.59271.59271.47151.4715
F21.59272.56172.49992.4999
F31.59272.56172.49992.4999
H41.47152.49992.49992.4470
H51.47152.49992.49992.4470

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.066 F2 Si1 H4 109.280
F2 Si1 H5 109.280 F3 Si1 H4 109.280
F3 Si1 H5 109.280 H4 Si1 H5 112.506
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 0.907      
2 F -0.313      
3 F -0.313      
4 H -0.141      
5 H -0.141      


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 1.309 1.309
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.816 0.000 0.000
y 0.000 -25.550 0.000
z 0.000 0.000 -22.930
Traceless
 xyz
x 1.424 0.000 0.000
y 0.000 -2.677 0.000
z 0.000 0.000 1.253
Polar
3z2-r22.506
x2-y22.734
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.574 0.000 0.000
y 0.000 2.247 0.000
z 0.000 0.000 2.407


<r2> (average value of r2) Å2
<r2> 57.859
(<r2>)1/2 7.607