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

using model chemistry: mPW1PW91/3-21G

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 mPW1PW91/3-21G
 hartrees
Energy at 0K-489.132137
Energy at 298.15K 
HF Energy-489.132137
Nuclear repulsion energy78.665347
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 mPW1PW91/3-21G
Rotational Constants (cm-1) from geometry optimized at mPW1PW91/3-21G
See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C*V)

Jump to S1C1
Energy calculated at mPW1PW91/3-21G
 hartrees
Energy at 0K-489.132184
Energy at 298.15K-489.132536
HF Energy-489.132184
Nuclear repulsion energy78.598327
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 mPW1PW91/3-21G
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 3870 3695 736.47      
2 Σ 2241 2139 469.22      
3 Σ 807 770 25.27      
4 Π 544 519 4.21      
4 Π 544 519 4.21      
5 Π 219 209 230.82      
5 Π 219 209 230.82      

Unscaled Zero Point Vibrational Energy (zpe) 4222.1 cm-1
Scaled (by 0.9546) Zero Point Vibrational Energy (zpe) 4030.4 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 mPW1PW91/3-21G
B
0.18710

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 -1.699
C2 0.000 0.000 -0.523
S3 0.000 0.000 1.108
H4 0.000 0.000 -2.692

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.17632.80650.9927
C21.17631.63022.1690
S32.80651.63023.7992
H40.99272.16903.7992

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 mPW1PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.794      
2 C 0.170      
3 S 0.224      
4 H 0.400      


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 -4.034 4.034
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.267 0.000 0.000
y 0.000 -25.267 0.000
z 0.000 0.000 -15.936
Traceless
 xyz
x -4.666 0.000 0.000
y 0.000 -4.666 0.000
z 0.000 0.000 9.331
Polar
3z2-r218.662
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 1.683 0.000 0.000
y 0.000 1.683 0.000
z 0.000 0.000 7.970


<r2> (average value of r2) Å2
<r2> 62.555
(<r2>)1/2 7.909