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All results from a given calculation for HOCN (cyanic acid)

using model chemistry: PBEPBE/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 PBEPBE/3-21G
 hartrees
Energy at 0K-167.512247
Energy at 298.15K-167.513120
Nuclear repulsion energy56.690160
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 PBEPBE/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' 3334 3303 49.46      
2 A' 2240 2220 46.26      
3 A' 1216 1205 94.29      
4 A' 995 986 81.85      
5 A' 447 443 19.15      
6 A" 472 467 0.44      

Unscaled Zero Point Vibrational Energy (zpe) 4352.1 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 4312.5 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 PBEPBE/3-21G
ABC
20.86371 0.33732 0.33196

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.073 1.368 0.000
C2 0.000 0.185 0.000
O3 -0.156 -1.136 0.000
H4 0.737 -1.604 0.000

Atom - Atom Distances (Å)
  N1 C2 O3 H4
N11.18532.51423.0454
C21.18531.32991.9351
O32.51421.32991.0089
H43.04541.93511.0089

picture of cyanic acid state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 O3 176.799 C2 O3 H4 110.912
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.398      
2 C 0.529      
3 O -0.534      
4 H 0.402      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.696 -3.399 0.000 3.798
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -15.054 -3.380 0.000
y -3.380 -17.913 0.000
z 0.000 0.000 -16.438
Traceless
 xyz
x 2.122 -3.380 0.000
y -3.380 -2.167 0.000
z 0.000 0.000 0.045
Polar
3z2-r20.091
x2-y22.859
xy-3.380
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.437 -0.142 0.000
y -0.142 4.049 0.000
z 0.000 0.000 1.033


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000