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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: B1B95/CEP-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 B1B95/CEP-31G
 hartrees
Energy at 0K-27.253769
Energy at 298.15K-27.253115
Nuclear repulsion energy35.646390
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 B1B95/CEP-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 3484 3336 75.30      
2 Σ 2351 2251 37.64      
3 Σ 2130 2040 0.15      
4 Σ 900 861 0.00      
5 Π 722 692 69.63      
5 Π 722 692 69.63      
6 Π 562 538 2.85      
6 Π 562 538 2.85      
7 Π 255 244 0.09      
7 Π 255 244 0.09      

Unscaled Zero Point Vibrational Energy (zpe) 5971.4 cm-1
Scaled (by 0.9575) Zero Point Vibrational Energy (zpe) 5717.6 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 B1B95/CEP-31G
B
0.14368

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/CEP-31G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.953
C2 0.000 0.000 0.760
C3 0.000 0.000 -0.646
C4 0.000 0.000 -1.898
H5 0.000 0.000 -2.970

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.19352.59943.85164.9236
C21.19351.40592.65803.7301
C32.59941.40591.25212.3242
C43.85162.65801.25211.0720
H54.92363.73012.32421.0720

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 B1B95/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N 0.473      
2 C -0.541      
3 C -0.058      
4 C -0.281      
5 H 0.407      


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 -3.958 3.958
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.551 0.000 0.000
y 0.000 -22.551 0.000
z 0.000 0.000 -21.405
Traceless
 xyz
x -0.573 0.000 0.000
y 0.000 -0.573 0.000
z 0.000 0.000 1.146
Polar
3z2-r22.292
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 2.030 0.000 0.000
y 0.000 2.030 0.000
z 0.000 0.000 10.257


<r2> (average value of r2) Å2
<r2> 0.000
(<r2>)1/2 0.000