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Science 19 May 2006:
Vol. 312. no. 5776, p. 969
DOI: 10.1126/science.312.5776.969c
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Figure 1 The networks of conjugated -orbitals in conducting polymers are stabilized either by bulky polyatomic side groups or phenyl groups incorporated within the backbone chains. Sun et al. (p. 1030; see the Perspective by Baughman) have prepared a polymer composed of strictly alternating C=C double and CC triple bonds, with only iodine atoms as side groups. The synthesis relied on prior templating of the diiododiacetylene monomer in a cocrystal with a dinitrile oxalamide host. Packing contacts between the nitriles and iodines allow the host structure to align the monomers in a column with relative spacings that changed little after polymerization. The product is a potential precursor to carbyne, a hypothesized but elusive linear allotrope of carbon.

CREDIT: SUN ET AL.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)