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All results from a given calculation for CH3CCH (propyne)

using model chemistry: CID/cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at CID/cc-pVTZ
 hartrees
Energy at 0K-116.351882
Energy at 298.15K 
HF Energy-115.909162
Nuclear repulsion energy59.060220
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 CID/cc-pVTZ
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 3570 3308 60.80      
2 A1 3139 2908 13.83      
3 A1 2308 2139 3.89      
4 A1 1470 1362 0.16      
5 A1 969 897 0.99      
6 E 3214 2977 6.74      
6 E 3214 2977 6.74      
7 E 1539 1426 7.80      
7 E 1539 1426 7.80      
8 E 1101 1020 0.14      
8 E 1101 1020 0.14      
9 E 716 664 45.72      
9 E 716 664 45.72      
10 E 363 336 9.49      
10 E 363 336 9.49      

Unscaled Zero Point Vibrational Energy (zpe) 12660.9 cm-1
Scaled (by 0.9265) Zero Point Vibrational Energy (zpe) 11730.3 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 CID/cc-pVTZ
ABC
5.41886 0.28827 0.28827

See section I.F.4 to change rotational constant units
Geometric Data calculated at CID/cc-pVTZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.238
C2 0.000 0.000 0.221
C3 0.000 0.000 1.415
H4 0.000 0.000 2.470
H5 0.000 1.014 -1.619
H6 0.878 -0.507 -1.619
H7 -0.878 -0.507 -1.619

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.45932.65263.70821.08351.08351.0835
C21.45931.19332.24892.10112.10112.1011
C32.65261.19331.05573.19843.19843.1984
H43.70822.24891.05574.21294.21294.2129
H51.08352.10113.19844.21291.75691.7569
H61.08352.10113.19844.21291.75691.7569
H71.08352.10113.19844.21291.75691.7569

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 110.575
C2 C1 H6 110.575 C2 C1 H7 110.575
C2 C3 H4 180.000 H5 C1 H6 108.345
H5 C1 H7 108.345 H6 C1 H7 108.345
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability