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 CH3CCH (propyne)

using model chemistry: CCD/cc-pVDZ

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-pVDZ
 hartrees
Energy at 0K-116.297767
Energy at 298.15K 
HF Energy-115.872374
Nuclear repulsion energy58.030636
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-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3486 3335 51.26      
2 A1 3077 2944 18.44      
3 A1 2228 2131 1.09      
4 A1 1423 1361 1.19      
5 A1 953 912 1.05      
6 E 3164 3027 8.74      
6 E 3164 3027 8.74      
7 E 1485 1420 6.61      
7 E 1485 1420 6.61      
8 E 1063 1017 0.30      
8 E 1063 1017 0.30      
9 E 645 617 37.77      
9 E 645 617 37.77      
10 E 333 319 6.25      
10 E 333 319 6.25      

Unscaled Zero Point Vibrational Energy (zpe) 12272.5 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 11741.1 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/cc-pVDZ
ABC
5.23231 0.27880 0.27880

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.256
C2 0.000 0.000 0.219
C3 0.000 0.000 1.440
H4 0.000 0.000 2.517
H5 0.000 1.032 -1.646
H6 0.894 -0.516 -1.646
H7 -0.894 -0.516 -1.646

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.47582.69693.77381.10331.10331.1033
C21.47581.22112.29792.13202.13202.1320
C32.69691.22111.07693.25453.25453.2545
H43.77382.29791.07694.28944.28944.2894
H51.10332.13203.25454.28941.78801.7880
H61.10332.13203.25454.28941.78801.7880
H71.10332.13203.25454.28941.78801.7880

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 110.674
C2 C1 H6 110.674 C2 C1 H7 110.674
C2 C3 H4 180.000 H5 C1 H6 108.242
H5 C1 H7 108.242 H6 C1 H7 108.242
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability