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

using model chemistry: B3LYP/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 B3LYP/3-21G*
 hartrees
Energy at 0K-167.737591
Energy at 298.15K-167.738453
Nuclear repulsion energy58.699392
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/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' 3735 3593 235.54      
2 A' 2381 2290 409.97      
3 A' 1319 1268 7.28      
4 A' 596 574 29.57      
5 A' 499 480 291.70      
6 A" 593 571 0.96      

Unscaled Zero Point Vibrational Energy (zpe) 4561.2 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 4387.8 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/3-21G*
ABC
51.37958 0.35897 0.35648

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.401 -1.488 0.000
N2 0.500 -1.047 0.000
C3 0.000 0.044 0.000
O4 -0.613 1.069 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00272.07603.2551
N21.00271.20022.3912
C32.07601.20021.1945
O43.25512.39121.1945

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 140.746 N2 C3 O4 173.768
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.348      
2 N -0.673      
3 C 0.779      
4 O -0.454      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.345 -1.424 0.000 2.744
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -13.392 -1.342 0.000
y -1.342 -17.653 0.000
z 0.000 0.000 -16.092
Traceless
 xyz
x 3.481 -1.342 0.000
y -1.342 -2.911 0.000
z 0.000 0.000 -0.570
Polar
3z2-r2-1.139
x2-y24.261
xy-1.342
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.728 -1.325 0.000
y -1.325 3.372 0.000
z 0.000 0.000 0.854


<r2> (average value of r2) Å2
<r2> 35.579
(<r2>)1/2 5.965