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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: CCSD(T)/6-31G*

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 CCSD(T)/6-31G*
 hartrees
Energy at 0K-169.113999
Energy at 298.15K-169.112841
HF Energy-168.542376
Nuclear repulsion energy76.034206
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(T)/6-31G*
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 3468 3336        
2 Σ 2324 2236        
3 Σ 2118 2037        
4 Σ 883 850        
5 Π 575 554        
5 Π 575 554        
6 Π 414 398        
6 Π 414 398        
7 Π 217 209        
7 Π 217 209        

Unscaled Zero Point Vibrational Energy (zpe) 5602.5 cm-1
Scaled (by 0.9621) Zero Point Vibrational Energy (zpe) 5390.2 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 CCSD(T)/6-31G*
B
0.14849

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/6-31G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.924
C2 0.000 0.000 0.746
C3 0.000 0.000 -0.641
C4 0.000 0.000 -1.861
H5 0.000 0.000 -2.933

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.17782.56553.78524.8566
C21.17781.38762.60743.6788
C32.56551.38761.21972.2912
C43.78522.60741.21971.0714
H54.85663.67882.29121.0714

picture of Cyanoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
N1 C2 C3 180.000 C2 C3 C4 180.000
C3 C4 H5 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability