Polyacetylene. Medical search. Frequent questions

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. (wikipedia.org)
Substituted polyacetylenes tend to be more rigid than saturated polymers. (wikipedia.org)
In: Conjugated Polymers, Oligomers and Dendrimers: From Polyacetylene to DNA, S. 205 - 262 (Hg. (mpg.de)
Poly(iminoborane)s (PIBs) are main group polymers with a B=N backbone, formally isoelectronic to polyacetylene. (chemistryviews.org)
The linear-backbone polymers such as polyacetylene, polypyrrole, and polyaniline are the main classes of conductive polymers. (parrot.org)

A segment of trans-polyacetylene Polyacetylene consists of a long chain of carbon atoms with alternating single and double bonds between them, each with one hydrogen atom. (wikipedia.org)
The controlled synthesis of each isomer of the polymer, cis-polyacetylene or trans-polyacetylene, can be achieved by changing the temperature at which the reaction is conducted. (wikipedia.org)
X-ray diffraction studies demonstrated that the resulting polyacetylene was trans-polyacetylene. (wikipedia.org)
Further studies led to improved control of the cis/trans isomer ratio and demonstrated that cis-polyacetylene doping led to higher conductivity than doping of trans-polyacetylene. (wikipedia.org)
Mori, Y & Kurihara, S 1988, ' Calculation of localized vibrational modes around a soliton in trans-polyacetylene using the molecular orbital method ', Synthetic Metals , vol. 22, no. 3, pp. 219-229. (elsevierpure.com)
We demonstrate nonadiabatic Thouless pumping of electrons in trans -polyacetylene in the framework of Floquet engineering using first-principles theory. (aps.org)

Sesquiterpene lactones, polyacetylenes, achilleine and flavonoids such as apigenin. (gaiaherbs.com)

Linear polyacetylene was first prepared by Giulio Natta in 1958. (wikipedia.org)
Many of today's flexible electronic devices can trace their ancestry back to the first synthesis of linear polyacetylene in 1958. (acs.org)

Synthesis of cyclic polyacetylene offers fresh take on classic semiconducting polymer. (acs.org)
Thin films of cyclic polyacetylene could prove useful in flexible electronic devices. (acs.org)
Cyclic polyacetylene is the largest annulene isolated to date, forming a circle of over 200 C-H units connected by alternating double and single bonds. (acs.org)
Another approach produced cyclic polyacetylene in a soluble form that could be chemically modified. (acs.org)
The Florida team first made the circular compound in 2016, and spent the intervening time confirming that it was indeed cyclic, rather than linear, polyacetylene. (acs.org)

I want to get the latest chemistry news from C&EN in my inbox every week. (acs.org)
Other areas of attention included the isolation, chemistry and biosynthesis of natural polyacetylenes from plant hairy root cultures as well as chemical and mechanistic aspects of chemically mediated plant-plant interactions (allelopathy) in the Florida Scrub. (lsu.edu)

Compounds called polyacetylenes also occur in nature, although in this context the term refers to polyynes, compounds containing multiple acetylene groups ("poly" meaning many), rather than to chains of olefin groups ("poly" meaning polymerization of). (wikipedia.org)

In 1987, BASF introduced polyacetylene with double the electrical conductivity of copper. (pcimag.com)

Shirakawa, Heeger, and MacDiarmid collaborated on further development of polyacetylene. (wikipedia.org)
Similarly, the defects introduced through chemical doping or photoexcitation show the characteristics of soliton-like states, with a single {"}mid-gap{"} electronic absorption feature which is at significantly higher energies than for stretched Durham or Shirakawa polyacetylene. (edu.sa)

After this first reported synthesis, few chemists were interested in polyacetylene because the product of Natta's preparation was an insoluble, air sensitive, and infusible black powder. (wikipedia.org)
I finally began working on polymer synthesis, my original interest, in my graduate program, but I started the work on polyacetylene, the work for which I now share the Nobel Prize, just after I received my doctorate and I became a research associate in April 1966. (nobelprize.org)

The resulting polyacetylene was linear, of high molecular weight, displayed high crystallinity, and had a regular structure. (wikipedia.org)
Vibrational frequencies of polyacetylene with a charged soliton are calculated for finite chain lengths using the molecular orbital method. (elsevierpure.com)

Despite the conjugated nature of the polyacetylene backbone, not all of the carbon-carbon bonds in the material are equal: a distinct single/double alternation exists. (wikipedia.org)

To account for such an increase in conductivity in polyacetylene, J. R. Schrieffer and Heeger considered the existence of topologically protected solitonic defects, their model is now known as the Su-Schrieffer-Heeger model, which has served as model in other contexts to understand topological insulators. (wikipedia.org)

abstract = "Polyacetylene prepared by the Durham precursor route can be obtained in a disordered form by thermal conversion of a solution-cast film of the precursor polymer, or in a highly oriented form by stretching the precursor film during the transformation reaction. (edu.sa)
abstract = "Ab initio Hartree-Fock-Roothaan calculations have been performed on clusters of increasing size modelling polyacetylene-polyme thineimeine copolymers of various compositions. (uaeu.ac.ae)

UV-guided isolation of enantiomeric polyacetylenes from Bupleurum scorzonerifolium Willd. (bvsalud.org)

The next major development of polyacetylene polymerization was made by Hideki Shirakawa's group who were able to prepare silvery films of polyacetylene. (wikipedia.org)
They discovered that the polymerization of polyacetylene could be achieved at the surface of a concentrated solution of the catalyst system of Et3Al and Ti(OBu)4 in an inert solvent such as toluene. (wikipedia.org)

The chemicals in blessed thistle - cnicin and polyacetylene can be helpful in fighting bacterial infections as they have activity against several types of bacteria. (diethealthclub.com)

This could be a fast, simple way to lay down high-purity polyacetylene coatings on flexible substrates. (acs.org)
Conjugated materials have attracted great attention since the discovery of high conductivity in donor and acceptor doped polyacetylene over two decades ago. (diva-portal.org)
in 1977 observed that polyacetylenes show high electrical conduction comparable with a metal when the insulating polyacetylenes obtain carriers by a bromine doping. (tcichemicals.com)
Because polyacetylene required large battery volume to achieve high capacity and had problems with instability, he switched to carbonaceous material for the anode and in 1985 fabricated and received the basic patent for the first prototype of the LIB. (nae.edu)

In the fall of 1967, only a short time after we started polyacetylene film through an unforeseeable experimental failure. (nobelprize.org)
however, one day, when a visiting scientist tried to make polyacetylene in the usual way, he only produced some ragged pieces of a film. (nobelprize.org)

I think people will be studying this material, just like they have linear polyacetylene, for a long time," says Adam S. Veige of the University of Florida, who led the work with his colleague Brent S. Sumerlin . (acs.org)

He began research on rechargeable batteries in 1981 and in 1983 fabricated a prototype rechargeable battery using lithium cobalt oxide (LiCoO 2 ) (discovered by John Goodenough in 1979) as cathode and polyacetylene as anode. (nae.edu)

Initially I was reluctant to work in this field, but actually, I realize that my experiences in this laboratory were of great importance to me when I worked with polyacetylene later on. (nobelprize.org)

The initial purpose of this study was to determine the polymierization mechanism of polyacetylene using the Ziegler-Natta catalysts. (nobelprize.org)

Polyacetylenes exhibit semiconducting-insulating properties by a lack of free electrons (carriers), although there are conducting pathways through π-conjugations. (tcichemicals.com)

Polyacetylene (IUPAC name: polyethyne) usually refers to an organic polymer with the repeating unit [C2H2]n. (wikipedia.org)
The controlled synthesis of each isomer of the polymer, cis-polyacetylene or trans-polyacetylene, can be achieved by changing the temperature at which the reaction is conducted. (wikipedia.org)

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. (wikipedia.org)

Yang, SRE 2019, ' Soliton fractional charges in graphene nanoribbon and polyacetylene: Similarities and differences ', Nanomaterials , vol. 9, no. 6, 885. (korea.ac.kr)

7. HPLC/UV analysis of polyacetylenes, phenylpropanoid and pyrrolidine alkaloids in medicinally used Codonopsis species. (nih.gov)
11. Quality evaluation of medicinally-used Codonopsis species and Codonopsis Radix based on the contents of pyrrolidine alkaloids, phenylpropanoid and polyacetylenes. (nih.gov)

In polyacetylene, a fermion mass potential in the Dirac equation produces an excitation gap, and a twist in this scalar potential produces a zero-energy chiral soliton. (korea.ac.kr)
In polyacetylene, a soliton is bound to a domain wall connecting two different dimerized phases. (korea.ac.kr)
The existence of a soliton in finite-length polyacetylene can induce formation of fractional charges on the opposite ends. (korea.ac.kr)

The method is employed to calculate the static and dynamic properties of the Su-Schrieffer-Heeger model for polyacetylene chains. (edpsciences.org)
39. Dinca S.A., Allis D.G., Lashua A.F., Sponsler M.B., and Hudson B.S. "Insulated polyacetylene chains in an inclusion complex by photopolymerization. (somewhereville.com)

Graphene nanoribbons and polyacetylene have chiral symmetry and share numerous similar properties, e.g., the bulk-edge correspondence between the Zak phase and the existence of edge states, along with the presence of chiral boundary states, which are important for charge fractionalization. (korea.ac.kr)

34. Lashua A.F., Allis D., Crill J., Dinca S., Sponsler M., and Hudson B.S. "Isolated polyacetylene in an inclusion complex: Exploration of synthetic methods. (somewhereville.com)

Electrical conductivity in doped polyacetylene. (nature.com)

To account for such an increase in conductivity in polyacetylene, J. R. Schrieffer and Heeger considered the existence of topologically protected solitonic defects, their model is now known as the Su-Schrieffer-Heeger model, which has served as model in other contexts to understand topological insulators. (wikipedia.org)

The next major development of polyacetylene polymerization was made by Hideki Shirakawa's group who were able to prepare silvery films of polyacetylene. (wikipedia.org)

We create analogues of two tight-binding models of fundamental importance: the polyacetylene (dimer) chain with topological domain-wall states, and the Lieb lattice with a flat electron band. (nature.com)

A variety of methods have been developed to synthesize polyacetylene, from pure acetylene and other monomers. (wikipedia.org)

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