return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for C6H2 (hexatriyne)

using model chemistry: B2PLYP=FULL/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at B2PLYP=FULL/6-31+G**
 hartrees
Energy at 0K-229.429121
Energy at 298.15K 
HF Energy-229.157630
Nuclear repulsion energy143.031817
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 B2PLYP=FULL/6-31+G**
Rotational Constants (cm-1) from geometry optimized at B2PLYP=FULL/6-31+G**
B
0.04382

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/6-31+G**

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.612
C2 0.000 0.000 -0.612
C3 0.000 0.000 1.983
C4 0.000 0.000 -1.983
C5 0.000 0.000 3.201
C6 0.000 0.000 -3.201
H7 0.000 0.000 4.265
H8 0.000 0.000 -4.265

Atom - Atom Distances (Å)
  C1 C2 C3 C4 C5 C6 H7 H8
C11.22361.37112.59472.58923.81273.65374.8773
C21.22362.59471.37113.81272.58924.87733.6537
C31.37112.59473.96581.21805.18382.28266.2484
C42.59471.37113.96585.18381.21806.24842.2826
C52.58923.81271.21805.18386.40191.06467.4664
C63.81272.58925.18381.21806.40197.46641.0646
H73.65374.87732.28266.24841.06467.46648.5310
H84.87733.65376.24842.28267.46641.06468.5310

picture of hexatriyne state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 C4 180.000 C1 C3 C5 180.000
C2 C1 C3 180.000 C2 C4 C6 180.000
C3 C5 H7 180.000 C4 C6 H8 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability