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 ICN (Cyanogen iodide)

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 C*V 1Σ
Energy calculated at CISD/3-21G
 hartrees
Energy at 0K-6979.834212
Energy at 298.15K-6979.831984
HF Energy-6979.607958
Nuclear repulsion energy162.045521
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 Σ 2310 2174 0.23      
2 Σ 502 473 3.79      
3 Π 391 368 1.02      
3 Π 391 368 1.02      

Unscaled Zero Point Vibrational Energy (zpe) 1796.8 cm-1
Scaled (by 0.9413) Zero Point Vibrational Energy (zpe) 1691.3 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
B
0.10289

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
I1 0.000 0.000 0.528
C2 0.000 0.000 -1.524
N3 0.000 0.000 -2.691

Atom - Atom Distances (Å)
  I1 C2 N3
I12.05193.2190
C22.05191.1671
N33.21901.1671

picture of Cyanogen iodide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
I1 C2 N3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability