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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: CCSD/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/6-31G*
 hartrees
Energy at 0K-169.087062
Energy at 298.15K-169.086091
HF Energy-168.544803
Nuclear repulsion energy76.285552
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/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 3490 3295 61.92      
2 Σ 2401 2267 16.82      
3 Σ 2175 2054 3.66      
4 Σ 890 841 0.18      
5 Π 610 576 47.44      
5 Π 610 576 47.44      
6 Π 472 446 1.38      
6 Π 472 446 1.38      
7 Π 232 219 1.14      
7 Π 232 219 1.14      

Unscaled Zero Point Vibrational Energy (zpe) 5791.9 cm-1
Scaled (by 0.9443) Zero Point Vibrational Energy (zpe) 5469.3 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/6-31G*
B
0.14927

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.917
C2 0.000 0.000 0.751
C3 0.000 0.000 -0.643
C4 0.000 0.000 -1.856
H5 0.000 0.000 -2.927

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.16652.56043.77354.8439
C21.16651.39392.60703.6774
C32.56041.39391.21312.2835
C43.77352.60701.21311.0704
H54.84393.67742.28351.0704

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