1,3,5,7-Octatetrayne

• Formula: C₈H₂
• Molecular weight: 98.1015
• IUPAC Standard InChI: InChI=1S/C8H2/c1-3-5-7-8-6-4-2/h1-2H Copy

  
• IUPAC Standard InChIKey: CDGAYCHXIBGGNI-UHFFFAOYSA-N Copy
• CAS Registry Number: 6165-96-4
• Chemical structure:
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• Information on this page:
  • Gas phase thermochemistry data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • UV/Visible spectrum
  • References
  • Notes
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Glushko Thermocenter, Russian Academy of Sciences, Moscow

Constant pressure heat capacity of gas

Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

C₈H^- +  =

By formula: C₈H^- + H⁺ = C₈H₂

Gas phase ion energetics data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi

Ionization energy determinations

De-protonation reactions

C₈H^- +  =

By formula: C₈H^- + H⁺ = C₈H₂

UV/Visible spectrum

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Victor Talrose, Alexander N. Yermakov, Alexy A. Usov, Antonina A. Goncharova, Axlexander N. Leskin, Natalia A. Messineva, Natalia V. Trusova, Margarita V. Efimkina

Spectrum

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Additional Data

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, UV/Visible spectrum, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Dorofeeva O.V., 1991
Dorofeeva O.V., Thermodynamic properties of linear carbon chain molecules with conjugated triple bonds. Part I. Polyacetylenes, H(CC)nH (n=2-6), cyanopolyacetylenes, H(CC)nCN (n=1-5), and dicyanopolyacetylenes, NC(CC)nCN (n=1-4), Thermochim. Acta, 1991, 178, 273-286. [all data]

Dessau L., 1988
Dessau L., Vibrations and thermodynamic functions of long-chain acetylenes, Z. Phys. Chem. (Leipzig), 1988, 269, 187-190. [all data]

Garand, Yacovitch, et al., 2010
Garand, E.; Yacovitch, T.I.; Zhou, J.; Sheehan, S.M.; Neumark, D.M., Slow photoelectron velocity-map imaging of the CnH- (n=5-9) anions, Chem. Sci., 2010, 1, 2, 192-201, https://doi.org/10.1039/c0sc00164c . [all data]

Allan, Heilbronner, et al., 1976
Allan, M.; Heilbronner, E.; Kloster-Jensen, E.; Maier, J.P., The {PI}-states of tetraacetylene radical cation, Chem. Phys. Lett., 1976, 41, 228. [all data]

Eastmond, et al., 1972
Eastmond, R., et al., Tetrahedron, 1972, 28, 4601. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, UV/Visible spectrum, References

• Symbols used in this document:
  

  Cp,gas	Constant pressure heat capacity of gas
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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