return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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-169.526677
Energy at 298.15K-169.526016
Nuclear repulsion energy76.500457
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 3502 3369 75.93      
2 Σ 2366 2276 36.79      
3 Σ 2158 2076 0.02      
4 Σ 912 877 0.00      
5 Π 719 692 57.44      
5 Π 719 692 57.44      
6 Π 576 554 2.81      
6 Π 576 554 2.81      
7 Π 244 235 0.05      
7 Π 244 235 0.05      

Unscaled Zero Point Vibrational Energy (zpe) 6008.3 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 5780.0 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
0.15063

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 1.913
C2 0.000 0.000 0.736
C3 0.000 0.000 -0.633
C4 0.000 0.000 -1.848
H5 0.000 0.000 -2.914

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.17722.54593.76094.8265
C21.17721.36872.58373.6493
C32.54591.36871.21492.2806
C43.76092.58371.21491.0656
H54.82653.64932.28061.0656

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 -0.136      
2 C -0.072      
3 C 0.303      
4 C -0.384      
5 H 0.290      


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 -3.886 3.886
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.190 0.000 0.000
y 0.000 -22.190 0.000
z 0.000 0.000 -21.150
Traceless
 xyz
x -0.520 0.000 0.000
y 0.000 -0.520 0.000
z 0.000 0.000 1.039
Polar
3z2-r22.078
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 1.760 0.000 0.000
y 0.000 1.760 0.000
z 0.000 0.000 9.565


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