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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: B3LYP/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 B3LYP/6-31G**
 hartrees
Energy at 0K-169.574161
Energy at 298.15K-169.573496
Nuclear repulsion energy76.755084
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 B3LYP/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 3481 3344 83.53      
2 Σ 2386 2292 28.46      
3 Σ 2186 2100 1.17      
4 Σ 912 876 0.00      
5 Π 666 640 46.53      
5 Π 666 640 46.53      
6 Π 579 556 1.72      
6 Π 579 556 1.72      
7 Π 260 250 0.65      
7 Π 260 250 0.65      

Unscaled Zero Point Vibrational Energy (zpe) 5986.9 cm-1
Scaled (by 0.9608) Zero Point Vibrational Energy (zpe) 5752.2 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 B3LYP/6-31G**
B
0.15141

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G**

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.905
C2 0.000 0.000 0.739
C3 0.000 0.000 -0.633
C4 0.000 0.000 -1.843
H5 0.000 0.000 -2.910

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.16632.53863.74854.8154
C21.16631.37232.58223.6491
C32.53861.37231.20992.2768
C43.74852.58221.20991.0669
H54.81543.64912.27681.0669

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 B3LYP/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.472      
2 C 0.090      
3 C 0.654      
4 C -0.481      
5 H 0.210      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -3.820 3.820
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.065 0.000 0.000
y 0.000 -22.065 0.000
z 0.000 0.000 -20.367
Traceless
 xyz
x -0.849 0.000 0.000
y 0.000 -0.849 0.000
z 0.000 0.000 1.698
Polar
3z2-r23.395
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.010 0.000 0.000
y 0.000 2.010 0.000
z 0.000 0.000 9.559


<r2> (average value of r2) Å2
<r2> 73.375
(<r2>)1/2 8.566