A study on the structure and electrical properties of the fourth carbon allotrope: carbyne

✍ Scribed by Franco Cataldo

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 355 KB
• Volume: 44
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199710)44:2<191::aid-pi842>3.0.co;2-y

✦ Synopsis

The acetylenic and cumulenic forms of carbyne (a and b-carbyne, respectively) have been obtained simultaneously by oxidative coupling of dicopper acetylide under Glaser conditions. Carbynes having copper atoms, or phenyl groups, at the ends of the chains were successfully synthesized. At room temperature these end-groups confer an indeÐnite stability to this allotrope, whereas at high temperature in vacuo b-carbyne is transformed to a-carbyne, which is thermodynamically more stable.

Carbyne chemical structure was studied and conÐrmed by FTIR spectroscopy, electronic spectroscopy, and X-ray di †raction. The chemical reactivity of carbyne was checked versus chlorine in the presence of UV light and dinitrogen tetroxide. The speciÐc conductivity of undoped carbyne obtained by Glaser synthesis was found to be in the range 2É11 ] 10~6È1É41 ] 10~6 S cm~1, just one order of magnitude lower than the conductivity of trans-polyacetylene. Polyeneyne or "Straus carbyneÏ was synthesized via the Straus reaction and its structure was studied by FTIR and electronic spectroscopy.