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: B1B95/aug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at B1B95/aug-cc-pVDZ
 hartrees
Energy at 0K-168.653115
Energy at 298.15K-168.654159
Nuclear repulsion energy 
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 B1B95/aug-cc-pVDZ
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' 3704 3548 155.65      
2 A' 2356 2257 761.40      
3 A' 1346 1289 0.17      
4 A' 813 778 193.16      
5 A' 567 543 82.49      
6 A" 638 611 2.84      

Unscaled Zero Point Vibrational Energy (zpe) 4711.6 cm-1
Scaled (by 0.9579) Zero Point Vibrational Energy (zpe) 4513.2 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 B1B95/aug-cc-pVDZ
ABC
27.80173 0.36915 0.36432

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/aug-cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 1.373 -1.350 0.000
N2 0.397 -1.100 0.000
C3 0.000 0.050 0.000
O4 -0.519 1.094 0.000

Atom - Atom Distances (Å)
  H1 N2 C3 O4
H11.00781.96043.0901
N21.00781.21632.3772
C31.96041.21631.1658
O43.09012.37721.1658

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 123.358 N2 C3 O4 172.615
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/aug-cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H -0.008      
2 N -0.010      
3 C 0.269      
4 O -0.251      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.905 -0.824 0.000 2.075
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.906 -1.033 0.000
y -1.033 4.671 0.000
z 0.000 0.000 2.348


<r2> (average value of r2) Å2
<r2> 35.326
(<r2>)1/2 5.944