Linear acetylenic carbon

Linear acetylenic carbon (LAC), also known as carbyne or Linear Carbon Chain (LCC), is an allotrope of carbon that has the chemical structure (−C≡C−)_n as a repeat unit, with alternating single and triple bonds.^[1]^[2] It would thus be the ultimate member of the polyyne family.

This polymeric carbyne is of considerable interest to nanotechnology as its Young's modulus is 32.7 TPa – forty times that of diamond;^[4] this extraordinary number is, however, based on a novel definition of cross-sectional area that does not correspond to the space occupied by the structure. Carbyne has also been identified in interstellar space; however, its existence in condensed phases has been contested recently, as such chains would crosslink exothermically (and perhaps explosively) if they approached each other.^[5]

^ Kudryavtsev, Yu P. (1999). "The Discovery of Carbyne". In Heimann, Robert B.; Evsyukov, Sergey E.; Kavan, Ladislav (eds.). Carbyne and Carbynoid Structures. Physics and Chemistry of Materials with Low-Dimensional Structures. Vol. 21. Dordrecht, The Netherlands: Springer. pp. 1–6. doi:10.1007/978-94-011-4742-2_1. ISBN 0-7923-5323-4.
^ Baughman, R. H. (2006). "CHEMISTRY: Dangerously Seeking Linear Carbon". Science. 312 (5776): 1009–1110. doi:10.1126/science.1125999. PMID 16709775. S2CID 93868586.
^ La Torre, A.; Botello-Mendez, A.; Baaziz, W.; Charlier, J. -C.; Banhart, F. (2015). "Strain-induced metal–semiconductor transition observed in atomic carbon chains". Nature Communications. 6: 6636. Bibcode:2015NatCo...6.6636L. doi:10.1038/ncomms7636. PMC 4389248. PMID 25818506.
^ Itzhaki, L.; Altus, E.; Basch, H.; Hoz, S. (2005). "Harder than Diamond: Determining the Cross-Sectional Area and Young's Modulus of Molecular Rods". Angewandte Chemie. 117 (45): 7598. Bibcode:2005AngCh.117.7598I. doi:10.1002/ange.200502448. Itzhaki, L.; Altus, E.; Basch, H.; Hoz, S. (2005). "Harder than Diamond: Determining the Cross-Sectional Area and Young's Modulus of Molecular Rods". Angewandte Chemie International Edition. 44 (45): 7432–7435. doi:10.1002/anie.200502448. PMID 16240306.
^ Cite error: The named reference kroto was invoked but never defined (see the help page).

[1] Kudryavtsev, Yu P. (1999). "The Discovery of Carbyne". In Heimann, Robert B.; Evsyukov, Sergey E.; Kavan, Ladislav (eds.). Carbyne and Carbynoid Structures. Physics and Chemistry of Materials with Low-Dimensional Structures. Vol. 21. Dordrecht, The Netherlands: Springer. pp. 1–6. doi:10.1007/978-94-011-4742-2_1. ISBN 0-7923-5323-4.

[2] Baughman, R. H. (2006). "CHEMISTRY: Dangerously Seeking Linear Carbon". Science. 312 (5776): 1009–1110. doi:10.1126/science.1125999. PMID 16709775. S2CID 93868586.

[3] La Torre, A.; Botello-Mendez, A.; Baaziz, W.; Charlier, J. -C.; Banhart, F. (2015). "Strain-induced metal–semiconductor transition observed in atomic carbon chains". Nature Communications. 6: 6636. Bibcode:2015NatCo...6.6636L. doi:10.1038/ncomms7636. PMC 4389248. PMID 25818506.

[4] Itzhaki, L.; Altus, E.; Basch, H.; Hoz, S. (2005). "Harder than Diamond: Determining the Cross-Sectional Area and Young's Modulus of Molecular Rods". Angewandte Chemie. 117 (45): 7598. Bibcode:2005AngCh.117.7598I. doi:10.1002/ange.200502448. Itzhaki, L.; Altus, E.; Basch, H.; Hoz, S. (2005). "Harder than Diamond: Determining the Cross-Sectional Area and Young's Modulus of Molecular Rods". Angewandte Chemie International Edition. 44 (45): 7432–7435. doi:10.1002/anie.200502448. PMID 16240306.

[kroto-5] Cite error: The named reference kroto was invoked but never defined (see the help page).

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