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All results from a given calculation for CH3CCH (propyne)

using model chemistry: G3

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at G3
 hartrees
Energy at 0K-116.555359
Energy at 298.15K-116.550504
HF Energy-115.864319
Nuclear repulsion energy59.037336
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 HF/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 A1 3665 3453 51.49      
2 A1 3216 3030 21.27      
3 A1 2419 2279 1.18      
4 A1 1565 1475 1.32      
5 A1 986 929 3.48      
6 E 3284 3094 17.70      
6 E 3284 3094 17.70      
7 E 1625 1531 5.55      
7 E 1625 1531 5.55      
8 E 1167 1100 0.36      
8 E 1167 1100 0.36      
9 E 796 750 52.13      
9 E 796 750 52.13      
10 E 393 370 9.00      
10 E 393 370 9.00      

Unscaled Zero Point Vibrational Energy (zpe) 13190.5 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 12428.0 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=FULL/6-31G*
ABC
5.34411 0.28252 0.28252

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.248
C2 0.000 0.000 0.215
C3 0.000 0.000 1.433
H4 0.000 0.000 2.500
H5 0.000 1.022 -1.634
H6 0.885 -0.511 -1.634
H7 -0.885 -0.511 -1.634

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46262.68093.74721.09281.09281.0928
C21.46261.21832.28462.11292.11292.1129
C32.68091.21831.06633.23333.23333.2333
H43.74722.28461.06634.25834.25834.2583
H51.09282.11293.23334.25831.77051.7705
H61.09282.11293.23334.25831.77051.7705
H71.09282.11293.23334.25831.77051.7705

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 110.619
C2 C1 H6 110.619 C2 C1 H7 110.619
C2 C3 H4 180.000 H5 C1 H6 108.300
H5 C1 H7 108.300 H6 C1 H7 108.300
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability