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All results from a given calculation for CH3CCH (propyne)

using model chemistry: QCISD(T)/daug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A'
Energy calculated at QCISD(T)/daug-cc-pVDZ
 hartrees
Energy at 0K-116.337323
Energy at 298.15K 
HF Energy-115.875210
Nuclear repulsion energy57.779390
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 QCISD(T)/daug-cc-pVDZ
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 3441 3441        
2 A1 3027 3027        
3 A1 2144 2144        
4 A1 1393 1393        
5 A1 929 929        
6 E 3109 3109        
6 E 3108 3108        
7 E 1464 1464        
7 E 1464 1464        
8 E 1038 1038        
8 E 1038 1038        
9 E 543 543        
9 E 543 543        
10 E 256 256        
10 E 255 255        

Unscaled Zero Point Vibrational Energy (zpe) 11874.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 11874.5 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 QCISD(T)/daug-cc-pVDZ
ABC
5.21136 0.27611 0.27611

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.264
C2 0.000 0.000 0.218
C3 0.000 0.000 1.449
H4 0.000 0.000 2.526
H5 0.000 1.034 -1.649
H6 0.896 -0.517 -1.649
H7 -0.896 -0.517 -1.649

Atom - Atom Distances (Å)
  C1 C2 C3 H4 H5 H6 H7
C11.48142.71283.78911.10381.10381.1038
C21.48141.23142.30772.13422.13422.1342
C32.71281.23141.07643.26633.26633.2663
H43.78912.30771.07644.30084.30084.3008
H51.10382.13423.26634.30081.79161.7916
H61.10382.13423.26634.30081.79161.7916
H71.10382.13423.26634.30081.79161.7916

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 110.435
C2 C1 H6 110.435 C2 C1 H7 110.435
C2 C3 H4 180.000 H5 C1 H6 108.490
H5 C1 H7 108.490 H6 C1 H7 108.490
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability