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All results from a given calculation for HCCCN (Cyanoacetylene)

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

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(2df,p)
 hartrees
Energy at 0K-169.182212
Energy at 298.15K-169.181420
Nuclear repulsion energy 
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(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 Σ 3520 3328 77.32      
2 Σ 2412 2281 17.13      
3 Σ 2183 2064 4.43      
4 Σ 888 840 0.09      
5 Π 685 647 38.31      
5 Π 685 647 38.31      
6 Π 526 498 4.08      
6 Π 526 498 4.08      
7 Π 232 220 0.56      
7 Π 232 220 0.56      

Unscaled Zero Point Vibrational Energy (zpe) 5944.6 cm-1
Scaled (by 0.9455) Zero Point Vibrational Energy (zpe) 5620.6 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(2df,p)
B
0.15109

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.904
C2 0.000 0.000 0.747
C3 0.000 0.000 -0.639
C4 0.000 0.000 -1.844
H5 0.000 0.000 -2.908

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.15772.54353.74854.8118
C21.15771.38582.59093.6541
C32.54351.38581.20502.2683
C43.74852.59091.20501.0633
H54.81183.65412.26831.0633

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