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/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-168.569445
Energy at 298.15K-168.570456
Nuclear repulsion energy58.820377
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/cc-pVTZ
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' 3600 3575 123.88      
2 A' 2293 2277 556.76      
3 A' 1294 1285 0.34      
4 A' 790 785 192.46      
5 A' 558 554 60.62      
6 A" 609 605 0.94      

Unscaled Zero Point Vibrational Energy (zpe) 4571.7 cm-1
Scaled (by 0.9931) Zero Point Vibrational Energy (zpe) 4540.2 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/cc-pVTZ
ABC
28.11388 0.36446 0.35980

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.506 -1.229 0.000
N2 0.508 -1.059 0.000
C3 0.000 0.051 0.000
O4 -0.633 1.042 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.01251.97633.1195
N21.01251.22102.3910
C31.97631.22101.1759
O43.11952.39101.1759

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 124.207 N2 C3 O4 172.031
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.192      
2 N -0.233      
3 C 0.212      
4 O -0.171      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.961 -0.665 0.000 2.071
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -13.534 -0.804 0.000
y -0.804 -18.576 0.000
z 0.000 0.000 -16.627
Traceless
 xyz
x 4.068 -0.804 0.000
y -0.804 -3.496 0.000
z 0.000 0.000 -0.572
Polar
3z2-r2-1.144
x2-y25.042
xy-0.804
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.827 -1.225 0.000
y -1.225 4.116 0.000
z 0.000 0.000 1.905


<r2> (average value of r2) Å2
<r2> 35.492
(<r2>)1/2 5.958