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

using model chemistry: MP2/CEP-121G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
1 2 no C*V 1Σ

Conformer 1 (CS)

Jump to S1C2
Energy calculated at MP2/CEP-121G*
 hartrees
Energy at 0K-26.090909
Energy at 298.15K-26.091631
HF Energy-25.667298
Nuclear repulsion energy26.818498
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 MP2/CEP-121G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3669 3496 224.46      
2 A' 1987 1893 630.30      
3 A' 878 837 0.88      
4 A' 640 610 452.46      
5 A' 447 426 78.52      
6 A" 470 448 10.08      

Unscaled Zero Point Vibrational Energy (zpe) 4045.5 cm-1
Scaled (by 0.9528) Zero Point Vibrational Energy (zpe) 3854.6 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 MP2/CEP-121G*
ABC
32.83838 0.19136 0.19025

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -0.216 1.706 0.000
C2 0.000 0.497 0.000
S3 0.067 -1.088 0.000
H4 0.437 2.481 0.000

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.22812.80751.0137
C21.22811.58572.0319
S32.80751.58573.5878
H41.01372.03193.5878

picture of Isothiocyanic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 S3 172.297 C2 N1 H4 129.782
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C*V)

Jump to S1C1
Energy calculated at MP2/CEP-121G*
 hartrees
Energy at 0K-26.086751
Energy at 298.15K 
HF Energy-25.666765
Nuclear repulsion energy26.892466
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 MP2/CEP-121G*
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 3878 3695 715.03      
2 Σ 2105 2005 655.14      
3 Σ 860 820 29.27      
4 Π 467 445 15.11      
4 Π 467 445 15.11      
5 Π 438i 418i 173.52      
5 Π 438i 418i 173.52      

Unscaled Zero Point Vibrational Energy (zpe) 3450.9 cm-1
Scaled (by 0.9528) Zero Point Vibrational Energy (zpe) 3288.0 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 MP2/CEP-121G*
B
0.18907

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 -1.698
C2 0.000 0.000 -0.498
S3 0.000 0.000 1.098
H4 0.000 0.000 -2.699

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.19972.79651.0012
C21.19971.59692.2009
S32.79651.59693.7978
H41.00122.20093.7978

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