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: MP2/6-31G(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 MP2/6-31G(2df,p)
 hartrees
Energy at 0K-169.177570
Energy at 298.15K-169.176708
HF Energy-168.558342
Nuclear repulsion energy76.408081
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 MP2/6-31G(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 3526 3330 92.58      
2 Σ 2249 2124 8.73      
3 Σ 2053 1939 5.48      
4 Σ 889 840 0.22      
5 Π 635 600 40.06      
6 Π 635 600 40.06      
7 Π 517 489 1.48      
8 Π 517 489 1.48      
9 Π 230 217 0.69      
10 Π 230 217 0.69      

Unscaled Zero Point Vibrational Energy (zpe) 5740.2 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 5421.7 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 MP2/6-31G(2df,p)
B
0.15028

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.910
C2 0.000 0.000 0.740
C3 0.000 0.000 -0.634
C4 0.000 0.000 -1.849
H5 0.000 0.000 -2.911

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.16932.54403.75844.8206
C21.16931.37472.58913.6514
C32.54401.37471.21442.2767
C43.75842.58911.21441.0623
H54.82063.65142.27671.0623

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