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: CISD/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 CISD/6-31G*
 hartrees
Energy at 0K-169.014655
Energy at 298.15K-169.013947
HF Energy-168.547787
Nuclear repulsion energy76.887097
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 CISD/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 3576 3310 68.58      
2 Σ 2511 2324 30.23      
3 Σ 2271 2103 3.13      
4 Σ 917 849 0.04      
5 Π 692 640 51.57      
5 Π 692 640 51.57      
6 Π 547 507 0.95      
6 Π 547 507 0.95      
7 Π 254 235 0.71      
7 Π 254 235 0.71      

Unscaled Zero Point Vibrational Energy (zpe) 6130.0 cm-1
Scaled (by 0.9258) Zero Point Vibrational Energy (zpe) 5675.2 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 CISD/6-31G*
B
0.15143

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.903
C2 0.000 0.000 0.746
C3 0.000 0.000 -0.641
C4 0.000 0.000 -1.841
H5 0.000 0.000 -2.905

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.15672.54363.74384.8079
C21.15671.38702.58723.6512
C32.54361.38701.20022.2642
C43.74382.58721.20021.0640
H54.80793.65122.26421.0640

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 CISD/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 N -0.444      
2 C 0.235      
3 C 0.295      
4 C -0.430      
5 H 0.344      


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> 73.641
(<r2>)1/2 8.581