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All results from a given calculation for HCCCN (Cyanoacetylene)

using model chemistry: CCD/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 CCD/6-31G*
 hartrees
Energy at 0K-169.080543
Energy at 298.15K-169.079602
HF Energy-168.545400
Nuclear repulsion energy76.378324
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 CCD/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 3497 3310 63.56      
2 Σ 2420 2290 14.36      
3 Σ 2192 2075 3.45      
4 Σ 894 847 0.15      
5 Π 616 583 49.09      
6 Π 616 583 49.09      
7 Π 480 455 1.04      
8 Π 480 455 1.04      
9 Π 235 223 1.16      
10 Π 235 223 1.16      

Unscaled Zero Point Vibrational Energy (zpe) 5833.2 cm-1
Scaled (by 0.9465) Zero Point Vibrational Energy (zpe) 5521.1 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 CCD/6-31G*
B
0.14960

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
N1 0.000 0.000 1.915
C2 0.000 0.000 0.750
C3 0.000 0.000 -0.643
C4 0.000 0.000 -1.854
H5 0.000 0.000 -2.925

Atom - Atom Distances (Å)
  N1 C2 C3 C4 H5
N11.16482.55833.76954.8397
C21.16481.39352.60473.6749
C32.55831.39351.21132.2814
C43.76952.60471.21131.0702
H54.83973.67492.28141.0702

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