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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: MP2/CEP-121G*

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 MP2/CEP-121G*
 hartrees
Energy at 0K-27.174929
Energy at 298.15K-27.174433
HF Energy-26.634494
Nuclear repulsion energy36.001036
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 MP2/CEP-121G*
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 3474 3310 73.15      
2 Σ 2181 2078 8.14      
3 Σ 1995 1901 2.89      
4 Σ 867 826 0.47      
5 Π 802 765 49.74      
5 Π 802 765 49.74      
6 Π 594 566 20.01      
6 Π 594 566 20.01      
7 Π 279 266 0.05      
7 Π 279 266 0.05      

Unscaled Zero Point Vibrational Energy (zpe) 5933.9 cm-1
Scaled (by 0.9528) Zero Point Vibrational Energy (zpe) 5653.8 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 MP2/CEP-121G*
B
0.14691

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-121G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.937
C2 0.000 0.000 0.744
C3 0.000 0.000 -0.643
C4 0.000 0.000 -1.871
H5 0.000 0.000 -2.941

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.19322.58063.80884.8780
C21.19321.38742.61563.6848
C32.58061.38741.22822.2974
C43.80882.61561.22821.0692
H54.87803.68482.29741.0692

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 MP2/CEP-121G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.021      
2 C -0.315      
3 C 0.711      
4 C -0.857      
5 H 0.482      


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


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


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