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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: LSDA/6-31G(2df,p)

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 LSDA/6-31G(2df,p)
 hartrees
Energy at 0K-168.585756
Energy at 298.15K-168.584972
Nuclear repulsion energy76.997224
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 LSDA/6-31G(2df,p)
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 3426 3371 107.90      
2 Σ 2340 2303 20.76      
3 Σ 2135 2101 1.57      
4 Σ 918 903 0.02      
5 Π 634 624 41.65      
5 Π 634 624 41.65      
6 Π 553 544 4.16      
6 Π 553 544 4.16      
7 Π 238 234 0.36      
7 Π 238 234 0.36      

Unscaled Zero Point Vibrational Energy (zpe) 5834.1 cm-1
Scaled (by 0.984) Zero Point Vibrational Energy (zpe) 5740.7 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 LSDA/6-31G(2df,p)
B
0.15280

See section I.F.4 to change rotational constant units
Geometric Data calculated at LSDA/6-31G(2df,p)

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.898
C2 0.000 0.000 0.730
C3 0.000 0.000 -0.624
C4 0.000 0.000 -1.836
H5 0.000 0.000 -2.909

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.16832.52253.73384.8074
C21.16831.35422.56563.6392
C32.52251.35421.21132.2849
C43.73382.56561.21131.0736
H54.80743.63922.28491.0736

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 LSDA/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.308      
2 C 0.224      
3 C 0.282      
4 C -0.461      
5 H 0.264      


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 -3.787 3.787
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.055 0.000 0.000
y 0.000 -22.055 0.000
z 0.000 0.000 -20.078
Traceless
 xyz
x -0.988 0.000 0.000
y 0.000 -0.988 0.000
z 0.000 0.000 1.977
Polar
3z2-r23.954
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 2.519 0.000 0.000
y 0.000 2.519 0.000
z 0.000 0.000 9.819


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