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

using model chemistry: B3PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3PW91/3-21G*
 hartrees
Energy at 0K-167.672643
Energy at 298.15K-167.673484
Nuclear repulsion energy58.760477
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 B3PW91/3-21G*
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' 3779 3626 272.00      
2 A' 2407 2309 415.25      
3 A' 1327 1273 7.97      
4 A' 600 575 15.12      
5 A' 464 445 308.60      
6 A" 601 577 1.14      

Unscaled Zero Point Vibrational Energy (zpe) 4588.7 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 4402.4 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 B3PW91/3-21G*
ABC
57.50517 0.35919 0.35696

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.343 -1.553 0.000
N2 0.474 -1.056 0.000
C3 0.000 0.044 0.000
O4 -0.583 1.086 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00082.08613.2664
N21.00081.19762.3883
C32.08611.19761.1939
O43.26642.38831.1939

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 143.061 N2 C3 O4 174.106
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.368      
2 N -0.708      
3 C 0.806      
4 O -0.466      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.322 -1.599 0.000 2.819
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -13.511 -1.546 0.000
y -1.546 -17.362 0.000
z 0.000 0.000 -16.111
Traceless
 xyz
x 3.225 -1.546 0.000
y -1.546 -2.551 0.000
z 0.000 0.000 -0.675
Polar
3z2-r2-1.349
x2-y23.851
xy-1.546
xz0.000
yz0.000


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> 35.535
(<r2>)1/2 5.961