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All results from a given calculation for CH3CCH (propyne)

using model chemistry: MP2/Def2TZVPP

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/Def2TZVPP
 hartrees
Energy at 0K-116.392138
Energy at 298.15K 
HF Energy-115.910791
Nuclear repulsion energy58.628954
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/Def2TZVPP
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 3499 3329 56.35 36.94 0.20 0.33
2 A1 3087 2937 12.75 203.44 0.01 0.01
3 A1 2151 2047 3.08 84.00 0.21 0.35
4 A1 1421 1352 0.04 6.81 0.50 0.66
5 A1 950 904 0.59 4.62 0.08 0.15
6 E 3172 3018 4.12 66.14 0.75 0.86
6 E 3172 3018 4.12 66.14 0.75 0.86
7 E 1500 1427 8.06 7.54 0.75 0.86
7 E 1500 1427 8.06 7.54 0.75 0.86
8 E 1063 1012 0.18 0.07 0.75 0.86
8 E 1063 1012 0.18 0.07 0.75 0.86
9 E 649 618 47.32 2.59 0.75 0.86
9 E 649 618 47.32 2.59 0.75 0.86
10 E 335 319 8.22 6.45 0.75 0.86
10 E 335 319 8.22 6.45 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12273.1 cm-1
Scaled (by 0.9515) Zero Point Vibrational Energy (zpe) 11677.8 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/Def2TZVPP
ABC
5.37882 0.28429 0.28429

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/Def2TZVPP

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 0.214
C3 0.000 0.000 1.429
H4 0.000 0.000 2.490
H5 0.000 1.018 -1.628
H6 0.882 -0.509 -1.628
H7 -0.882 -0.509 -1.628

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.45842.67253.73391.08811.08811.0881
C21.45841.21412.27552.10502.10502.1050
C32.67251.21411.06143.22163.22163.2216
H43.73392.27551.06144.24194.24194.2419
H51.08812.10503.22164.24191.76341.7634
H61.08812.10503.22164.24191.76341.7634
H71.08812.10503.22164.24191.76341.7634

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 110.666
C2 C1 H6 110.666 C2 C1 H7 110.666
C2 C3 H4 180.000 H5 C1 H6 108.251
H5 C1 H7 108.251 H6 C1 H7 108.251
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability