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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-169.089356
Energy at 298.15K-169.088375
HF Energy-168.544441
Nuclear repulsion energy76.231204
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 QCISD/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 3487 3321 61.09      
2 Σ 2389 2275 20.61      
3 Σ 2164 2061 3.57      
4 Σ 887 845 0.20      
5 Π 608 579 47.11      
5 Π 608 579 47.11      
6 Π 470 447 1.41      
6 Π 470 447 1.41      
7 Π 231 220 1.15      
7 Π 231 220 1.15      

Unscaled Zero Point Vibrational Energy (zpe) 5772.1 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 5496.7 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 QCISD/6-31G*
B
0.14907

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.918
C2 0.000 0.000 0.751
C3 0.000 0.000 -0.643
C4 0.000 0.000 -1.857
H5 0.000 0.000 -2.928

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.16742.56153.77564.8461
C21.16741.39422.60823.6788
C32.56151.39421.21412.2846
C43.77562.60821.21411.0705
H54.84613.67882.28461.0705

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