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 HNCO (Isocyanic acid)

using model chemistry: MP2=FULL/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2=FULL/6-31+G**
 hartrees
Energy at 0K-168.253616
Energy at 298.15K-168.254617
HF Energy-167.766850
Nuclear repulsion energy58.538296
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=FULL/6-31+G**
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' 3776 3547 181.54      
2 A' 2340 2198 652.43      
3 A' 1303 1224 0.21      
4 A' 761 715 251.46      
5 A' 563 529 86.45      
6 A" 615 578 0.25      

Unscaled Zero Point Vibrational Energy (zpe) 4679.6 cm-1
Scaled (by 0.9392) Zero Point Vibrational Energy (zpe) 4395.1 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=FULL/6-31+G**
ABC
29.05143 0.36040 0.35599

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31+G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.612 -1.101 0.000
N2 0.611 -1.010 0.000
C3 0.000 0.054 0.000
O4 -0.736 0.981 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00531.98303.1384
N21.00531.22632.4037
C31.98301.22631.1841
O43.13842.40371.1841

picture of Isocyanic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H1 N2 C3 125.106 N2 C3 O4 171.445
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability