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

using model chemistry: B3PW91/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B3PW91/6-311G*
 hartrees
Energy at 0K-168.658997
Energy at 298.15K-168.660032
Nuclear repulsion energy59.356365
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 B3PW91/6-311G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3722 3583 134.34      
2 A' 2381 2292 677.76      
3 A' 1350 1300 0.61      
4 A' 787 757 229.08      
5 A' 576 555 94.99      
6 A" 640 616 4.07      

Unscaled Zero Point Vibrational Energy (zpe) 4727.9 cm-1
Scaled (by 0.9627) Zero Point Vibrational Energy (zpe) 4551.5 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 B3PW91/6-311G*
ABC
30.72268 0.37041 0.36600

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.349 -1.401 0.000
N2 0.393 -1.094 0.000
C3 0.000 0.050 0.000
O4 -0.512 1.095 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00431.98103.1135
N21.00431.20962.3690
C31.98101.20961.1640
O43.11352.36901.1640

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 126.725 N2 C3 O4 172.838
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/6-311G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.368      
2 N -0.620      
3 C 0.525      
4 O -0.274      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.118 -0.896 0.000 2.300
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -13.404 -1.458 0.000
y -1.458 -18.506 0.000
z 0.000 0.000 -16.428
Traceless
 xyz
x 4.063 -1.458 0.000
y -1.458 -3.590 0.000
z 0.000 0.000 -0.473
Polar
3z2-r2-0.946
x2-y25.102
xy-1.458
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> 35.014
(<r2>)1/2 5.917