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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: PBEPBE/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 PBEPBE/6-31G**
 hartrees
Energy at 0K-169.367533
Energy at 298.15K-169.366743
Nuclear repulsion energy76.226652
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 PBEPBE/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 3418 3371 86.22      
2 Σ 2296 2264 20.43      
3 Σ 2109 2080 0.53      
4 Σ 901 889 0.00      
5 Π 609 601 46.69      
5 Π 609 601 46.69      
6 Π 553 545 0.77      
6 Π 553 545 0.77      
7 Π 250 247 0.52      
7 Π 250 247 0.52      

Unscaled Zero Point Vibrational Energy (zpe) 5773.4 cm-1
Scaled (by 0.9863) Zero Point Vibrational Energy (zpe) 5694.3 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 PBEPBE/6-31G**
B
0.14966

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.918
C2 0.000 0.000 0.738
C3 0.000 0.000 -0.632
C4 0.000 0.000 -1.855
H5 0.000 0.000 -2.929

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.18092.55073.77354.8477
C21.18091.36982.59263.6669
C32.55071.36981.22282.2970
C43.77352.59261.22281.0742
H54.84773.66692.29701.0742

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 PBEPBE/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.474      
2 C 0.085      
3 C 0.654      
4 C -0.476      
5 H 0.211      


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 -3.740 3.740
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.086 0.000 0.000
y 0.000 -22.086 0.000
z 0.000 0.000 -20.041
Traceless
 xyz
x -1.023 0.000 0.000
y 0.000 -1.023 0.000
z 0.000 0.000 2.045
Polar
3z2-r24.091
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 2.039 0.000 0.000
y 0.000 2.039 0.000
z 0.000 0.000 9.979


<r2> (average value of r2) Å2
<r2> 74.023
(<r2>)1/2 8.604