polyacetylene

{{Chembox |Verifiedfields = changed |verifiedrevid = 464209345 |IUPACName = Polyethyne |OtherNames = Polyacetylene, PAc |ImageFile1 = Trans-Polyacetylene.svg |ImageClass1 = skin-invert |ImageCaption1 = Skeletal formula of trans-polyacetylene |ImageName1 = trans-polyacetylene |ImageSize1 = 185px |ImageFile2 = Cis-Polyacetylene.svg |ImageClass2 = skin-invert |ImageCaption2 = Skeletal formula of cis-polyacetylene |ImageName2 = cis-polyacetylene |ImageSize2 = 180px |ImageFile3 = Cis-and-trans-polyacetylene-chains-symmetric-8-based-on-xtals-3D-bs-17.png |ImageClass3 = bg-transparent |ImageCaption3 = Ball-and-stick models of the transoidal (top) and cisoidal (bottom) conformations of the trans isomer |Section1 = |Section2 = {{Chembox Properties |Formula = {{chem2|[C2H2]_{n} }} |Solubility = insoluble}} |Section7 = |Section3 = }}

Polyacetylene (IUPAC name: polyethyne) usually refers to an organic polymer with the repeating unit {{chem2|[C2H2]_{n} }}. The name refers to its conceptual construction from polymerization of acetylene to give a chain with repeating olefin groups (a conjugated polyene). This compound is conceptually important, as the discovery of polyacetylene and its high conductivity upon doping helped to launch the field of organic conductive polymers. The high electrical conductivity discovered by Hideki Shirakawa, Alan Heeger, and Alan MacDiarmid for this polymer led to intense interest in the use of organic compounds in microelectronics (organic semiconductors). This discovery was recognized by the Nobel Prize in Chemistry in 2000. Early work in the field of polyacetylene research was aimed at using doped polymers as easily processable and lightweight "plastic metals". Despite the promise of this polymer in the field of conductive polymers, many of its properties such as instability to air and difficulty with processing have led to avoidance in commercial applications.