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

using model chemistry: mPW1PW91/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at mPW1PW91/6-31+G**
 hartrees
Energy at 0K-168.642072
Energy at 298.15K-168.643081
Nuclear repulsion energy59.124244
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 mPW1PW91/6-31+G**
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' 3760 3578 184.59      
2 A' 2376 2262 764.63      
3 A' 1358 1293 0.44      
4 A' 751 715 206.20      
5 A' 566 539 105.86      
6 A" 628 598 2.72      

Unscaled Zero Point Vibrational Energy (zpe) 4719.5 cm-1
Scaled (by 0.9518) Zero Point Vibrational Energy (zpe) 4492.0 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 mPW1PW91/6-31+G**
ABC
30.33748 0.36755 0.36315

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31+G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.439 -1.313 0.000
N2 0.464 -1.071 0.000
C3 0.000 0.051 0.000
O4 -0.586 1.063 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00471.98223.1217
N21.00471.21382.3786
C31.98221.21381.1700
O43.12172.37861.1700

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 126.371 N2 C3 O4 172.424
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.341      
2 N -0.535      
3 C 0.621      
4 O -0.427      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  2.211 -0.792 0.000 2.349
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -13.538 -1.087 0.000
y -1.087 -19.174 0.000
z 0.000 0.000 -16.805
Traceless
 xyz
x 4.452 -1.087 0.000
y -1.087 -4.003 0.000
z 0.000 0.000 -0.448
Polar
3z2-r2-0.897
x2-y25.637
xy-1.087
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> 35.446
(<r2>)1/2 5.954