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All results from a given calculation for HNCO (Isocyanic acid)

using model chemistry: B2PLYP/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B2PLYP/6-31G*
 hartrees
Energy at 0K-168.526159
Energy at 298.15K 
HF Energy-168.369021
Nuclear repulsion energy58.751721
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 B2PLYP/6-31G*
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' 3709 3520 137.66      
2 A' 2346 2227 535.10      
3 A' 1319 1252 0.45      
4 A' 803 762 249.63      
5 A' 563 534 67.03      
6 A" 609 578 1.85      

Unscaled Zero Point Vibrational Energy (zpe) 4674.0 cm-1
Scaled (by 0.9492) Zero Point Vibrational Energy (zpe) 4436.5 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 B2PLYP/6-31G*
See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.540 -1.190 0.000
N2 0.543 -1.043 0.000
C3 0.000 0.052 0.000
O4 -0.667 1.023 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00761.97793.1254
N21.00761.22202.3945
C31.97791.22201.1786
O43.12542.39451.1786

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 124.746 N2 C3 O4 171.882
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B2PLYP/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.390      
2 N -0.677      
3 C 0.717      
4 O -0.430      


Electric dipole moments


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 2.436 -1.386 0.000
y -1.386 3.703 0.000
z 0.000 0.000 1.295


<r2> (average value of r2) Å2
<r2> 35.560
(<r2>)1/2 5.963