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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: CCD/STO-3G

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 CCD/STO-3G
 hartrees
Energy at 0K-166.728782
Energy at 298.15K-166.727794
HF Energy-166.398133
Nuclear repulsion energy74.518580
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 CCD/STO-3G
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 3640 3640 93.67      
2 Σ 2390 2390 0.28      
3 Σ 2197 2197 39.76      
4 Σ 855 855 1.19      
5 Π 745 745 10.01      
5 Π 745 745 10.01      
6 Π 537 537 1.77      
6 Π 537 537 1.77      
7 Π 225 225 0.80      
7 Π 225 225 0.80      

Unscaled Zero Point Vibrational Energy (zpe) 6047.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6047.8 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 CCD/STO-3G
B
0.14229

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/STO-3G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.971
C2 0.000 0.000 0.761
C3 0.000 0.000 -0.672
C4 0.000 0.000 -1.891
H5 0.000 0.000 -2.980

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.21052.64363.86234.9515
C21.21051.43302.65173.7410
C32.64361.43301.21872.3080
C43.86232.65171.21871.0893
H54.95153.74102.30801.0893

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
Charges from optimized geometry at CCD/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.139      
2 C 0.080      
3 C -0.025      
4 C -0.050      
5 H 0.133      


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 76.425
(<r2>)1/2 8.742