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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: MP2/6-31G*

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 MP2/6-31G*
 hartrees
Energy at 0K-169.079098
Energy at 298.15K-169.078080
HF Energy-168.539717
Nuclear repulsion energy75.977376
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*
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 3510 3310 78.34      
2 Σ 2247 2119 9.65      
3 Σ 2052 1935 4.99      
4 Σ 892 841 0.37      
5 Π 589 556 42.40      
5 Π 589 556 42.40      
6 Π 459 433 6.63      
6 Π 459 433 6.63      
7 Π 231 218 1.60      
7 Π 231 218 1.60      

Unscaled Zero Point Vibrational Energy (zpe) 5630.7 cm-1
Scaled (by 0.943) Zero Point Vibrational Energy (zpe) 5309.8 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 MP2/6-31G*
B
0.14860

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.921
C2 0.000 0.000 0.744
C3 0.000 0.000 -0.639
C4 0.000 0.000 -1.859
H5 0.000 0.000 -2.927

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.17692.56003.78084.8488
C21.17691.38312.60393.6719
C32.56001.38311.22082.2888
C43.78082.60391.22081.0680
H54.84883.67192.28881.0680

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