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All results from a given calculation for CH3CCH (propyne)

using model chemistry: MP4/6-311G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at MP4/6-311G**
 hartrees
Energy at 0K-116.360218
Energy at 298.15K 
HF Energy-115.892778
Nuclear repulsion energy58.242771
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 MP4/6-311G**
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 3478 3373        
2 A1 3051 2958        
3 A1 2130 2066        
4 A1 1425 1382        
5 A1 936 907        
6 E 3128 3034        
6 E 3128 3033        
7 E 1499 1453        
7 E 1499 1453        
8 E 1062 1030        
8 E 1062 1030        
9 E 605 587        
9 E 605 587        
10 E 282 274        
10 E 282 273        

Unscaled Zero Point Vibrational Energy (zpe) 12086.1 cm-1
Scaled (by 0.9697) Zero Point Vibrational Energy (zpe) 11719.9 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 MP4/6-311G**
ABC
5.29170 0.28054 0.28054

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/6-311G**

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.253
C2 0.000 0.000 0.218
C3 0.000 0.000 1.437
H4 0.000 0.000 2.504
H5 0.000 1.026 -1.638
H6 0.889 -0.513 -1.638
H7 -0.889 -0.513 -1.638

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.47072.69063.75721.09631.09631.0963
C21.47071.21982.28652.12072.12072.1207
C32.69061.21981.06663.24233.24233.2423
H43.75722.28651.06664.26754.26754.2675
H51.09632.12073.24234.26751.77791.7779
H61.09632.12073.24234.26751.77791.7779
H71.09632.12073.24234.26751.77791.7779

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 110.558
C2 C1 H6 110.558 C2 C1 H7 110.558
C2 C3 H4 180.000 H5 C1 H6 108.363
H5 C1 H7 108.363 H6 C1 H7 108.363
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability