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All results from a given calculation for CH3CCH (propyne)

using model chemistry: CCD/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at CCD/cc-pVTZ
 hartrees
Energy at 0K-116.408096
Energy at 298.15K 
HF Energy-115.908413
Nuclear repulsion energy58.747037
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/cc-pVTZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3500 3268 53.87      
2 A1 3074 2870 14.29      
3 A1 2241 2093 2.75      
4 A1 1437 1342 0.13      
5 A1 950 887 0.86      
6 E 3148 2940 6.89      
6 E 3148 2940 6.89      
7 E 1506 1407 7.35      
7 E 1506 1407 7.35      
8 E 1075 1004 0.11      
8 E 1075 1004 0.11      
9 E 664 620 44.37      
9 E 664 620 44.37      
10 E 342 319 7.84      
10 E 342 319 7.84      

Unscaled Zero Point Vibrational Energy (zpe) 12337.3 cm-1
Scaled (by 0.9337) Zero Point Vibrational Energy (zpe) 11519.3 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 CCD/cc-pVTZ
ABC
5.36773 0.28533 0.28533

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCD/cc-pVTZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.244
C2 0.000 0.000 0.220
C3 0.000 0.000 1.423
H4 0.000 0.000 2.484
H5 0.000 1.019 -1.627
H6 0.883 -0.510 -1.627
H7 -0.883 -0.510 -1.627

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46392.66633.72721.08891.08891.0889
C21.46391.20242.26332.10992.10992.1099
C32.66631.20241.06083.21563.21563.2156
H43.72722.26331.06084.23514.23514.2351
H51.08892.10993.21564.23511.76531.7653
H61.08892.10993.21564.23511.76531.7653
H71.08892.10993.21564.23511.76531.7653

picture of propyne state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C3 180.000 C2 C1 H5 110.622
C2 C1 H6 110.622 C2 C1 H7 110.622
C2 C3 H4 180.000 H5 C1 H6 108.297
H5 C1 H7 108.297 H6 C1 H7 108.297
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability