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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: MP2=FULL/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=FULL/6-31G(2df,p)
 hartrees
Energy at 0K-169.209803
Energy at 298.15K-169.209271
HF Energy-168.559807
Nuclear repulsion energy76.690059
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=FULL/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 3537 3324 92.28      
2 Σ 2274 2137 8.63      
3 Σ 2069 1945 5.61      
4 Σ 898 844 0.17      
5 Π 728 685 7.01      
6 Π 728 685 7.01      
7 Π 653 614 35.08      
8 Π 653 614 35.08      
9 Π 256 240 0.28      
10 Π 256 240 0.28      

Unscaled Zero Point Vibrational Energy (zpe) 6026.5 cm-1
Scaled (by 0.9399) Zero Point Vibrational Energy (zpe) 5664.3 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 MP2=FULL/6-31G(2df,p)
B
0.15140

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

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 0.737
C3 0.000 0.000 -0.631
C4 0.000 0.000 -1.842
H5 0.000 0.000 -2.903

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.16542.53413.74484.8056
C21.16541.36872.57943.6402
C32.53411.36871.21082.2715
C43.74482.57941.21081.0607
H54.80563.64022.27151.0607

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