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

using model chemistry: CISD/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 CISD/3-21G*
 hartrees
Energy at 0K-167.075220
Energy at 298.15K-167.076063
Nuclear repulsion energy57.155186
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 CISD/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' 3606 3369 86.07      
2 A' 2381 2225 38.36      
3 A' 1311 1225 123.41      
4 A' 1024 957 67.84      
5 A' 430 402 19.06      
6 A" 445 416 7.92      

Unscaled Zero Point Vibrational Energy (zpe) 4598.5 cm-1
Scaled (by 0.9344) Zero Point Vibrational Energy (zpe) 4296.9 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 CISD/3-21G*
ABC
21.80070 0.34157 0.33630

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.155 1.349 0.000
C2 0.000 0.194 0.000
O3 -0.214 -1.122 0.000
H4 0.632 -1.630 0.000

Atom - Atom Distances (Å)
  N1 C2 O3 H4
N11.16522.49783.0163
C21.16521.33291.9299
O32.49781.33290.9875
H43.01631.92990.9875

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 178.374 C2 O3 H4 111.692
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability