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All results from a given calculation for CH3CCH (propyne)

using model chemistry: MP2/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at MP2/6-311G*
 hartrees
Energy at 0K-116.284518
Energy at 298.15K-116.286669
HF Energy-115.885730
Nuclear repulsion energy58.438591
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 MP2/6-311G*
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 3493 3319 48.25      
2 A1 3087 2933 14.40      
3 A1 2150 2043 0.87      
4 A1 1450 1378 0.25      
5 A1 950 902 1.17      
6 E 3173 3015 7.87      
6 E 3173 3015 7.87      
7 E 1522 1447 9.85      
7 E 1522 1447 9.85      
8 E 1064 1011 0.42      
8 E 1064 1011 0.42      
9 E 534 508 55.18      
9 E 534 508 55.18      
10 E 239 227 0.83      
10 E 239 227 0.83      

Unscaled Zero Point Vibrational Energy (zpe) 12096.1 cm-1
Scaled (by 0.9503) Zero Point Vibrational Energy (zpe) 11494.9 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 MP2/6-311G*
ABC
5.34126 0.28248 0.28248

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G*

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 0.216
C3 0.000 0.000 1.432
H4 0.000 0.000 2.497
H5 0.000 1.022 -1.632
H6 0.885 -0.511 -1.632
H7 -0.885 -0.511 -1.632

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46362.68023.74491.09191.09191.0919
C21.46361.21662.28132.11172.11172.1117
C32.68021.21661.06473.23053.23053.2305
H43.74492.28131.06474.25394.25394.2539
H51.09192.11173.23054.25391.77021.7702
H61.09192.11173.23054.25391.77021.7702
H71.09192.11173.23054.25391.77021.7702

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 110.608
C2 C1 H6 110.608 C2 C1 H7 110.608
C2 C3 H4 180.000 H5 C1 H6 108.311
H5 C1 H7 108.311 H6 C1 H7 108.311
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability