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All results from a given calculation for CH3CCH (propyne)

using model chemistry: MP2/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at MP2/6-31+G**
 hartrees
Energy at 0K-116.280026
Energy at 298.15K 
HF Energy-115.873972
Nuclear repulsion energy58.392416
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 MP2/6-31+G**
Rotational Constants (cm-1) from geometry optimized at MP2/6-31+G**
ABC
5.36763 0.28173 0.28173

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.250
C2 0.000 0.000 0.214
C3 0.000 0.000 1.436
H4 0.000 0.000 2.500
H5 0.000 1.019 -1.634
H6 0.883 -0.510 -1.634
H7 -0.883 -0.510 -1.634

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46342.68583.74931.08921.08921.0892
C21.46341.22242.28592.11012.11012.1101
C32.68581.22241.06353.23483.23483.2348
H43.74932.28591.06354.25734.25734.2573
H51.08922.11013.23484.25731.76531.7653
H61.08922.11013.23484.25731.76531.7653
H71.08922.11013.23484.25731.76531.7653

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 110.657
C2 C1 H6 110.657 C2 C1 H7 110.657
C2 C3 H4 180.000 H5 C1 H6 108.260
H5 C1 H7 108.260 H6 C1 H7 108.260
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability