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: MP2=FULL/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 MP2=FULL/6-31G
 hartrees
Energy at 0K-116.098301
Energy at 298.15K 
HF Energy-115.819580
Nuclear repulsion energy57.830014
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=FULL/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 3484 3310 36.64 41.31 0.21 0.34
2 A1 3061 2908 18.91 146.67 0.00 0.00
3 A1 2127 2021 0.03 36.09 0.32 0.48
4 A1 1496 1422 0.08 20.72 0.58 0.73
5 A1 931 885 2.34 4.18 0.22 0.36
6 E 3137 2980 16.50 75.56 0.75 0.86
6 E 3137 2980 16.50 75.56 0.75 0.86
7 E 1558 1480 7.42 23.94 0.75 0.86
7 E 1558 1480 7.42 23.94 0.75 0.86
8 E 1103 1048 0.82 0.42 0.75 0.86
8 E 1103 1048 0.82 0.42 0.75 0.86
9 E 518 492 66.28 0.13 0.75 0.86
9 E 518 492 66.28 0.13 0.75 0.86
10 E 35i 34i 0.26 10.23 0.75 0.86
10 E 35i 34i 0.26 10.23 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 11828.9 cm-1
Scaled (by 0.9501) Zero Point Vibrational Energy (zpe) 11238.7 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
5.30371 0.27591 0.27591

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 -1.262
C2 0.000 0.000 0.218
C3 0.000 0.000 1.451
H4 0.000 0.000 2.521
H5 0.000 1.025 -1.657
H6 0.888 -0.513 -1.657
H7 -0.888 -0.513 -1.657

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.48002.71313.78241.09881.09881.0988
C21.48001.23312.30232.13702.13702.1370
C32.71311.23311.06923.27293.27293.2729
H43.78242.30231.06924.30134.30134.3013
H51.09882.13703.27294.30131.77591.7759
H61.09882.13703.27294.30131.77591.7759
H71.09882.13703.27294.30131.77591.7759

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 111.069
C2 C1 H6 111.069 C2 C1 H7 111.069
C2 C3 H4 180.000 H5 C1 H6 107.828
H5 C1 H7 107.828 H6 C1 H7 107.828
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability