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

using model chemistry: MP4=FULL/3-21G

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 MP4=FULL/3-21G
 hartrees
Energy at 0K-488.220366
Energy at 298.15K-488.220931
HF Energy-487.920818
Nuclear repulsion energy77.188722
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 MP4=FULL/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3699 3621        
2 A' 2012 1969        
3 A' 767 751        
4 A' 476 466        
5 A' 422 413        
6 A" 477 467        

Unscaled Zero Point Vibrational Energy (zpe) 3926.6 cm-1
Scaled (by 0.9788) Zero Point Vibrational Energy (zpe) 3843.4 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 MP4=FULL/3-21G
ABC
76.89031 0.18137 0.18094

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -0.090 1.737 0.000
C2 0.000 0.533 0.000
S3 0.017 -1.124 0.000
H4 0.366 2.633 0.000

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.20722.86271.0060
C21.20721.65692.1321
S32.86271.65693.7735
H41.00602.13213.7735

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 176.285 C2 N1 H4 148.743
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C*V)

Jump to S1C1
Energy calculated at MP4=FULL/3-21G
 hartrees
Energy at 0K-488.219647
Energy at 298.15K 
HF Energy-487.925214
Nuclear repulsion energy77.175769
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 MP4=FULL/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Σ 3785 3705        
2 Σ 2059 2016        
3 Σ 753 737        
4 Π 481 471        
4 Π 481 471        
5 Π 294i 288i        
5 Π 294i 288i        

Unscaled Zero Point Vibrational Energy (zpe) 3485.0 cm-1
Scaled (by 0.9788) Zero Point Vibrational Energy (zpe) 3411.2 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 MP4=FULL/3-21G
B
0.18018

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4=FULL/3-21G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 -1.731
C2 0.000 0.000 -0.536
S3 0.000 0.000 1.129
H4 0.000 0.000 -2.730

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.19562.86030.9988
C21.19561.66472.1943
S32.86031.66473.8591
H40.99882.19433.8591

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