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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: CCSD=FULL/cc-pVTZ

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=FULL/cc-pVTZ
 hartrees
Energy at 0K-169.301384
Energy at 298.15K-169.300664
HF Energy-168.605777
Nuclear repulsion energy77.149485
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/cc-pVTZ
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 3499 3317 71.68      
2 Σ 2420 2294 15.09      
3 Σ 2186 2073 2.69      
4 Σ 891 845 0.14      
5 Π 731 693 37.00      
5 Π 731 693 37.00      
6 Π 533 505 6.39      
6 Π 533 505 6.39      
7 Π 236 224 0.20      
7 Π 236 224 0.20      

Unscaled Zero Point Vibrational Energy (zpe) 5997.7 cm-1
Scaled (by 0.9481) Zero Point Vibrational Energy (zpe) 5686.4 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/cc-pVTZ
B
0.15257

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD=FULL/cc-pVTZ

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.895
C2 0.000 0.000 0.743
C3 0.000 0.000 -0.636
C4 0.000 0.000 -1.836
H5 0.000 0.000 -2.892

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.15132.53103.73024.7871
C21.15131.37972.57893.6358
C32.53101.37971.19922.2561
C43.73022.57891.19921.0569
H54.78713.63582.25611.0569

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