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All results from a given calculation for SiH2F2 (difluorosilane)

using model chemistry: B3LYP/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 B3LYP/3-21G*
 hartrees
Energy at 0K-487.990558
Energy at 298.15K 
HF Energy-487.990558
Nuclear repulsion energy118.165112
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 B3LYP/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 2344 2255 73.11 121.52 0.11 0.20
2 A1 1005 967 197.80 17.15 0.50 0.67
3 A1 917 882 5.29 7.37 0.52 0.68
4 A1 336 324 17.99 0.79 0.75 0.86
5 A2 779 749 0.00 13.96 0.75 0.86
6 B1 2347 2258 200.07 33.19 0.75 0.86
7 B1 751 723 153.26 5.34 0.75 0.86
8 B2 1112 1070 287.68 1.81 0.75 0.86
9 B2 956 919 9.17 8.99 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5273.2 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 5072.8 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 B3LYP/3-21G*
ABC
0.79630 0.25713 0.20902

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/3-21G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.454
F2 0.000 1.283 -0.494
F3 0.000 -1.283 -0.494
H4 1.228 0.000 1.273
H5 -1.228 0.000 1.273

Atom - Atom Distances (Å)
  Si1 F2 F3 H4 H5
Si11.59501.59501.47661.4766
F21.59502.56552.50572.5057
F31.59502.56552.50572.5057
H41.47662.50572.50572.4566
H51.47662.50572.50572.4566

picture of difluorosilane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
F2 Si1 F3 107.067 F2 Si1 H4 109.262
F2 Si1 H5 109.262 F3 Si1 H4 109.262
F3 Si1 H5 109.262 H4 Si1 H5 112.572
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.837      
2 F -0.294      
3 F -0.294      
4 H -0.124      
5 H -0.124      


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 1.280 1.280
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.762 0.000 0.000
y 0.000 -25.424 0.000
z 0.000 0.000 -22.869
Traceless
 xyz
x 1.384 0.000 0.000
y 0.000 -2.608 0.000
z 0.000 0.000 1.224
Polar
3z2-r22.447
x2-y22.661
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.653 0.000 0.000
y 0.000 2.309 0.000
z 0.000 0.000 2.471


<r2> (average value of r2) Å2
<r2> 57.951
(<r2>)1/2 7.613