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All results from a given calculation for CH3CCH (propyne)

using model chemistry: CCSD(T)/daug-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 CCSD(T)/daug-cc-pVTZ
 hartrees
Energy at 0K-116.443847
Energy at 298.15K 
HF Energy-115.908506
Nuclear repulsion energy58.508329
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(T)/daug-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 3451 3451        
2 A1 3043 3043        
3 A1 2170 2170        
4 A1 1413 1413        
5 A1 935 935        
6 E 3118 3118        
6 E 3117 3117        
7 E 1493 1493        
7 E 1493 1493        
8 E 1059 1059        
8 E 1059 1059        
9 E 631 631        
9 E 631 631        
10 E 316 316        
10 E 316 316        

Unscaled Zero Point Vibrational Energy (zpe) 12121.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 12121.5 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(T)/daug-cc-pVTZ
ABC
5.33802 0.28307 0.28307

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/daug-cc-pVTZ

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 0.218
C3 0.000 0.000 1.430
H4 0.000 0.000 2.494
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
C11.46622.67803.74211.09161.09161.0916
C21.46621.21182.27602.11332.11332.1133
C32.67801.21181.06423.22763.22763.2276
H43.74212.27601.06424.25044.25044.2504
H51.09162.11333.22764.25041.77021.7702
H61.09162.11333.22764.25041.77021.7702
H71.09162.11333.22764.25041.77021.7702

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 110.569
C2 C1 H6 110.569 C2 C1 H7 110.569
C2 C3 H4 180.000 H5 C1 H6 108.351
H5 C1 H7 108.351 H6 C1 H7 108.351
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability