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All results from a given calculation for HNCS (Isothiocyanic acid)

using model chemistry: HF/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 2 yes C*V 1Σ

Conformer 1 (CS)

Jump to S1C2
Energy calculated at HF/3-21G
 hartrees
Energy at 0K-487.913085
Energy at 298.15K 
HF Energy-487.913085
Nuclear repulsion energy77.238546
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 HF/3-21G
Rotational Constants (cm-1) from geometry optimized at HF/3-21G
See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/3-21G
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C*V)

Jump to S1C1
Energy calculated at HF/3-21G
 hartrees
Energy at 0K-487.929938
Energy at 298.15K-487.930943
HF Energy-487.929938
Nuclear repulsion energy78.532144
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 HF/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 Σ 4026 3646 901.19      
2 Σ 2370 2146 556.61      
3 Σ 737 668 46.62      
4 Π 635 575 144.62      
4 Π 635 575 144.62      
5 Π 477 432 133.81      
5 Π 477 432 133.81      

Unscaled Zero Point Vibrational Energy (zpe) 4678.0 cm-1
Scaled (by 0.9056) Zero Point Vibrational Energy (zpe) 4236.4 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 HF/3-21G
B
0.18610

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 -1.696
C2 0.000 0.000 -0.544
S3 0.000 0.000 1.113
H4 0.000 0.000 -2.678

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.15192.80950.9816
C21.15191.65762.1336
S32.80951.65763.7911
H40.98162.13363.7911

picture of Isothiocyanic acid state 1 conformation 2
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 S3 180.000 C2 N1 H4 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.910      
2 C 0.328      
3 S 0.135      
4 H 0.448      


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 -4.837 4.837
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.934 0.000 0.000
y 0.000 -25.934 0.000
z 0.000 0.000 -16.629
Traceless
 xyz
x -4.652 0.000 0.000
y 0.000 -4.652 0.000
z 0.000 0.000 9.305
Polar
3z2-r218.609
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.587 0.000 0.000
y 0.000 1.587 0.000
z 0.000 0.000 7.584


<r2> (average value of r2) Å2
<r2> 63.180
(<r2>)1/2 7.949