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All results from a given calculation for CH3CCH (propyne)

using model chemistry: CCSD/TZVP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at CCSD/TZVP
 hartrees
Energy at 0K-116.347841
Energy at 298.15K 
HF Energy-115.905444
Nuclear repulsion energy58.644083
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 CCSD/TZVP
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 3508 3348 48.68      
2 A1 3078 2938 18.90      
3 A1 2231 2129 2.13      
4 A1 1450 1384 0.35      
5 A1 943 900 1.31      
6 E 3152 3008 10.90      
6 E 3152 3008 10.90      
7 E 1508 1439 7.17      
7 E 1508 1439 7.17      
8 E 1072 1023 0.08      
8 E 1072 1023 0.08      
9 E 547 522 56.57      
9 E 547 522 56.57      
10 E 166 159 0.57      
10 E 166 159 0.57      

Unscaled Zero Point Vibrational Energy (zpe) 12049.2 cm-1
Scaled (by 0.9544) Zero Point Vibrational Energy (zpe) 11499.8 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 CCSD/TZVP
ABC
5.34650 0.28437 0.28437

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.246
C2 0.000 0.000 0.220
C3 0.000 0.000 1.425
H4 0.000 0.000 2.488
H5 0.000 1.021 -1.629
H6 0.884 -0.511 -1.629
H7 -0.884 -0.511 -1.629

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46572.67123.73331.09081.09081.0908
C21.46571.20552.26762.11232.11232.1123
C32.67121.20551.06223.22063.22063.2206
H43.73332.26761.06224.24144.24144.2414
H51.09082.11233.22064.24141.76881.7688
H61.09082.11233.22064.24141.76881.7688
H71.09082.11233.22064.24141.76881.7688

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 110.574
C2 C1 H6 110.574 C2 C1 H7 110.574
C2 C3 H4 180.000 H5 C1 H6 108.347
H5 C1 H7 108.347 H6 C1 H7 108.347
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability