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All results from a given calculation for CH3CCH (propyne)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at CBS-Q
 hartrees
Energy at 0K-116.422543
Energy at 298.15K-116.417705
HF Energy-115.861922
Nuclear repulsion energy58.918776
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 CBS-Q
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3651 3651 54.30      
2 A1 3199 3199 21.39      
3 A1 2415 2415 1.24      
4 A1 1550 1550 1.42      
5 A1 983 983 3.16      
6 E 3272 3272 16.88      
6 E 3272 3272 16.88      
7 E 1617 1617 5.66      
7 E 1617 1617 5.66      
8 E 1159 1159 0.30      
8 E 1159 1159 0.30      
9 E 769 769 48.23      
9 E 769 769 48.23      
10 E 386 386 7.75      
10 E 386 386 7.75      

Unscaled Zero Point Vibrational Energy (zpe) 13101.2 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 13101.2 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 CBS-Q
ABC
5.30776 0.27996 0.27996

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.243
C2 0.000 0.000 0.227
C3 0.000 0.000 1.417
H4 0.000 0.000 2.476
H5 0.000 1.017 -1.626
H6 0.881 -0.508 -1.626
H7 -0.881 -0.508 -1.626

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.46962.65943.71861.08681.08681.0868
C21.46961.18982.24902.11352.11352.1135
C32.65941.18981.05923.20803.20803.2080
H43.71862.24901.05924.22594.22594.2259
H51.08682.11353.20804.22591.76151.7615
H61.08682.11353.20804.22591.76151.7615
H71.08682.11353.20804.22591.76151.7615

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 110.642
C2 C1 H6 110.642 C2 C1 H7 110.642
C2 C3 H4 180.000 H5 C1 H6 108.276
H5 C1 H7 108.276 H6 C1 H7 108.276
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability