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A study on the structure and electrical properties of the fourth carbon allotrope: carbyne
Author(s) -
Cataldo Franco
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199710)44:2<191::aid-pi842>3.0.co;2-y
Subject(s) - carbyne , materials science , carbon fibers , nanotechnology , composite material , chemistry , organic chemistry , carbene , catalysis , composite number
The acetylenic and cumulenic forms of carbyne (α and β‐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 indefinite stability to this allotrope, whereas at high temperature in vacuo β‐carbyne is transformed to α‐carbyne, which is thermodynamically more stable. Carbyne chemical structure was studied and confirmed by FTIR spectroscopy, electronic spectroscopy, and X‐ray diffraction. The chemical reactivity of carbyne was checked versus chlorine in the presence of UV light and dinitrogen tetroxide. The specific conductivity of undoped carbyne obtained by Glaser synthesis was found to be in the range 2·11×10 ‐6 –1·41×10 ‐6 Scm ‐1 , just one order of magnitude lower than the conductivity of trans ‐polyacetylene. Polyeneyne or ‘Straus carbyne’ was synthesized via the Straus reaction and its structure was studied by FTIR and electronic spectroscopy. ©1997 SCI