return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: MP2/3-21G

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 MP2/3-21G
 hartrees
Energy at 0K-488.187437
Energy at 298.15K-488.187954
HF Energy-487.923510
Nuclear repulsion energy77.642129
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 MP2/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3751 3580 543.43      
2 A' 2092 1997 441.26      
3 A' 788 752 18.79      
4 A' 480 458 3.44      
5 A' 358 342 390.44      
6 A" 483 461 1.06      

Unscaled Zero Point Vibrational Energy (zpe) 3975.7 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 3794.8 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 MP2/3-21G
ABC
113.51213 0.18322 0.18292

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 -0.072 1.724 0.000
C2 0.000 0.529 0.000
S3 0.012 -1.119 0.000
H4 0.305 2.653 0.000

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.19702.84421.0022
C21.19701.64812.1455
S32.84421.64813.7831
H41.00222.14553.7831

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 176.991 C2 N1 H4 154.497
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability

Conformer 2 (C*V)

Jump to S1C1
Energy calculated at MP2/3-21G
 hartrees
Energy at 0K-488.187107
Energy at 298.15K 
HF Energy-487.926326
Nuclear repulsion energy77.594176
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 MP2/3-21G
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 3803 3630 721.94      
2 Σ 2117 2021 418.83      
3 Σ 773 738 39.48      
4 Π 485 463 1.32      
4 Π 485 463 1.32      
5 Π 249i 238i 218.28      
5 Π 249i 238i 218.28      

Unscaled Zero Point Vibrational Energy (zpe) 3582.8 cm-1
Scaled (by 0.9545) Zero Point Vibrational Energy (zpe) 3419.8 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 MP2/3-21G
B
0.18222

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/3-21G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 -1.722
C2 0.000 0.000 -0.531
S3 0.000 0.000 1.123
H4 0.000 0.000 -2.719

Atom - Atom Distances (Å)
  N1 C2 S3 H4
N11.19022.84420.9977
C21.19021.65402.1879
S32.84421.65403.8419
H40.99772.18793.8419

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