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 C2N2 (Cyanogen)

using model chemistry: CCSD=FULL/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at CCSD=FULL/6-31G(2df,p)
 hartrees
Energy at 0K-185.284808
Energy at 298.15K-185.284314
HF Energy-184.603957
Nuclear repulsion energy76.780132
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 CCSD=FULL/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σg 2494 2348 0.00      
2 Σg 881 830 0.00      
3 Σu 2284 2151 2.09      
4 Πg 700 659 0.00      
4 Πg 700 659 0.00      
5 Πu 295 278 22.23      
5 Πu 295 278 22.23      

Unscaled Zero Point Vibrational Energy (zpe) 3823.6 cm-1
Scaled (by 0.9416) Zero Point Vibrational Energy (zpe) 3600.3 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 CCSD=FULL/6-31G(2df,p)
B
0.15751

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD=FULL/6-31G(2df,p)

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.692
C2 0.000 0.000 -0.692
N3 0.000 0.000 1.847
N4 0.000 0.000 -1.847

Atom - Atom Distances (Å)
  C1 C2 N3 N4
C11.38411.15492.5390
C21.38412.53901.1549
N31.15492.53903.6939
N42.53901.15493.6939

picture of Cyanogen state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 N4 180.000 C2 C1 N3 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability