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: CID/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at CID/6-31G*
 hartrees
Energy at 0K-116.222330
Energy at 298.15K 
HF Energy-115.863721
Nuclear repulsion energy58.723064
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 CID/6-31G*
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 3571 3298 48.67      
2 A1 3144 2904 15.09      
3 A1 2323 2146 0.86      
4 A1 1498 1384 0.06      
5 A1 976 901 1.88      
6 E 3221 2975 10.30      
6 E 3221 2975 10.30      
7 E 1563 1444 7.09      
7 E 1563 1444 7.09      
8 E 1106 1021 0.61      
8 E 1106 1021 0.61      
9 E 621 574 54.83      
9 E 621 574 54.83      
10 E 325 301 2.40      
10 E 325 301 2.40      

Unscaled Zero Point Vibrational Energy (zpe) 12592.1 cm-1
Scaled (by 0.9237) Zero Point Vibrational Energy (zpe) 11631.3 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 CID/6-31G*
ABC
5.35920 0.28516 0.28516

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

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 0.221
C3 0.000 0.000 1.423
H4 0.000 0.000 2.486
H5 0.000 1.020 -1.629
H6 0.883 -0.510 -1.629
H7 -0.883 -0.510 -1.629

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46492.66623.72961.09051.09051.0905
C21.46491.20132.26482.11302.11302.1130
C32.66621.20131.06343.21783.21783.2178
H43.72962.26481.06344.23984.23984.2398
H51.09052.11303.21784.23981.76671.7667
H61.09052.11303.21784.23981.76671.7667
H71.09052.11303.21784.23981.76671.7667

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 110.713
C2 C1 H6 110.713 C2 C1 H7 110.713
C2 C3 H4 180.000 H5 C1 H6 108.202
H5 C1 H7 108.202 H6 C1 H7 108.202
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability