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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: CCSD/aug-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/aug-cc-pVTZ
 hartrees
Energy at 0K-169.250735
Energy at 298.15K-169.249930
HF Energy-168.606461
Nuclear repulsion energy76.818286
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/aug-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 3471 3318 72.34      
2 Σ 2393 2288 15.82      
3 Σ 2164 2069 2.04      
4 Σ 883 844 0.14      
5 Π 703 672 37.35      
5 Π 703 672 37.35      
6 Π 509 487 5.35      
6 Π 509 487 5.35      
7 Π 226 216 0.21      
7 Π 226 216 0.21      

Unscaled Zero Point Vibrational Energy (zpe) 5894.8 cm-1
Scaled (by 0.9558) Zero Point Vibrational Energy (zpe) 5634.3 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/aug-cc-pVTZ
B
0.15118

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.902
C2 0.000 0.000 0.748
C3 0.000 0.000 -0.640
C4 0.000 0.000 -1.844
H5 0.000 0.000 -2.906

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.15402.54203.74594.8088
C21.15401.38812.59193.6548
C32.54201.38811.20392.2667
C43.74592.59191.20391.0629
H54.80883.65482.26671.0629

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