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: G4

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at G4
 hartrees
Energy at 0K-168.625691
Energy at 298.15K-168.621504
HF Energy-168.695453
Nuclear repulsion energy59.198080
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 B3LYP/6-31G(2df,p)
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' 3697 3567 142.10      
2 A' 2358 2275 599.70      
3 A' 1341 1294 0.49      
4 A' 805 777 201.60      
5 A' 576 556 84.93      
6 A" 645 623 4.49      

Unscaled Zero Point Vibrational Energy (zpe) 4710.9 cm-1
Scaled (by 0.965) Zero Point Vibrational Energy (zpe) 4546.1 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 B3LYP/6-31G(2df,p)
ABC
29.08086 0.36884 0.36422

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.364 -1.372 0.000
N2 0.397 -1.098 0.000
C3 0.000 0.049 0.000
O4 -0.517 1.096 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00571.96993.1033
N21.00571.21362.3764
C31.96991.21361.1676
O43.10332.37641.1676

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 125.974 N2 C3 O4 173.455
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.297      
2 N -0.586      
3 C 0.553      
4 O -0.264      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.893 -0.811 0.000 2.059
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 35.006
(<r2>)1/2 5.917