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

using model chemistry: QCISD(T)/cc-pVTZ

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 QCISD(T)/cc-pVTZ
 hartrees
Energy at 0K-491.026126
Energy at 298.15K-491.026872
HF Energy-490.461725
Nuclear repulsion energy79.413442
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 QCISD(T)/cc-pVTZ
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' 3689 3499        
2 A' 2007 1904        
3 A' 864 820        
4 A' 652 618        
5 A' 450 427        
6 A" 482 457        

Unscaled Zero Point Vibrational Energy (zpe) 4071.4 cm-1
Scaled (by 0.9486) Zero Point Vibrational Energy (zpe) 3862.2 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 QCISD(T)/cc-pVTZ
ABC
33.18809 0.19413 0.19300

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -0.164 1.698 0.000
C2 0.000 0.498 0.000
S3 0.039 -1.082 0.000
H4 0.519 2.435 0.000

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.21082.78721.0051
C21.21081.58072.0046
S32.78721.58073.5490
H41.00512.00463.5490

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 173.628 C2 N1 H4 129.329
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C*V)

Jump to S1C1
Energy calculated at QCISD(T)/cc-pVTZ
 hartrees
Energy at 0K-491.021679
Energy at 298.15K 
HF Energy-490.460809
Nuclear repulsion energy79.459747
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 QCISD(T)/cc-pVTZ
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 3894 3693        
2 Σ 2132 2023        
3 Σ 842 799        
4 Π 480 455        
4 Π 480 455        
5 Π 471i 447i        
5 Π 471i 447i        

Unscaled Zero Point Vibrational Energy (zpe) 3442.3 cm-1
Scaled (by 0.9486) Zero Point Vibrational Energy (zpe) 3265.4 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 QCISD(T)/cc-pVTZ
B
0.19161

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/cc-pVTZ

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 -1.684
C2 0.000 0.000 -0.502
S3 0.000 0.000 1.092
H4 0.000 0.000 -2.675

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.18232.77640.9909
C21.18231.59412.1732
S32.77641.59413.7673
H40.99092.17323.7673

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