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: PBEPBE/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 PBEPBE/6-31G*
 hartrees
Energy at 0K-168.498974
Energy at 298.15K-168.499953
Nuclear repulsion energy58.416255
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 PBEPBE/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' 3598 3547 104.59      
2 A' 2309 2276 477.00      
3 A' 1296 1278 0.30      
4 A' 796 784 216.38      
5 A' 548 540 50.24      
6 A" 588 580 0.39      

Unscaled Zero Point Vibrational Energy (zpe) 4567.5 cm-1
Scaled (by 0.9857) Zero Point Vibrational Energy (zpe) 4502.2 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 PBEPBE/6-31G*
ABC
27.45551 0.35960 0.35495

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.638 -1.063 0.000
N2 0.624 -1.005 0.000
C3 0.000 0.054 0.000
O4 -0.751 0.972 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.01621.98303.1379
N21.01621.22912.4074
C31.98301.22911.1854
O43.13792.40741.1854

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 123.778 N2 C3 O4 171.209
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.362      
2 N -0.599      
3 C 0.595      
4 O -0.357      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.135 -0.346 0.000 2.163
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -12.955 -0.314 0.000
y -0.314 -18.540 0.000
z 0.000 0.000 -16.358
Traceless
 xyz
x 4.494 -0.314 0.000
y -0.314 -3.884 0.000
z 0.000 0.000 -0.610
Polar
3z2-r2-1.220
x2-y25.585
xy-0.314
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.708 -1.442 0.000
y -1.442 3.467 0.000
z 0.000 0.000 1.323


<r2> (average value of r2) Å2
<r2> 35.646
(<r2>)1/2 5.970