The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Noah Z. Burns - One of the best experts on this subject based on the ideXlab platform.
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Mechanochemical synthesis of an elusive fluorinated Polyacetylene
Nature Chemistry, 2020Co-Authors: Benjamin R. Boswell, Carl M. F. Mansson, Jordan M. Cox, Zexin Jin, Joseph A. H. Romaniuk, Kurt P. Lindquist, Lynette Cegelski, Yan Xia, Steven A. Lopez, Noah Z. BurnsAbstract:Fluorinated Polyacetylene has typically proven to be inaccessible using traditional Polymer synthesis, but there is much interest in its predicted properties. Now, a mechanochemical unzipping strategy has succeeded in the synthesis of a gold-coloured, semiconducting fluorinated Polyacetylene with improved stability in air compared to Polyacetylene. Polymer mechanochemistry has traditionally been employed to study the effects of mechanical force on chemical bonds within a Polymer backbone or to generate force-responsive materials. It is under-exploited for the scalable synthesis of wholly new materials by chemically transforming the Polymers, especially products inaccessible by other means. Here we utilize Polymer mechanochemistry to synthesize a fluorinated Polyacetylene, a long-sought-after air-stable Polyacetylene that has eluded synthesis by conventional means. We construct the monomer in four chemical steps on gram scale, which involves a rapid incorporation of fluorine atoms in an exotic photochemical cascade whose mechanism and exquisite stereoselectivity were informed by computation. After Polymerization, force activation by ultrasonication produces a gold-coloured, semiconducting fluoroPolymer. This work demonstrates that Polymer mechanochemistry is a valuable synthetic tool for accessing materials on a preparative scale.
Kwon-taek Lim - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and properties of an ionic Polyacetylene by the activated Polymerization of 2-ethynylpyridine with the ring-opening of propiolactone
Synthetic Metals, 2011Co-Authors: Yeong-soon Gal, Sung-ho Jin, Young-il Park, Jong-wook Park, Won Seok Lyoo, Kwon-taek LimAbstract:Abstract A new ionic Polyacetylene was prepared by the activated Polymerization of 2-ethynylpyridine with the ring-opening of β-propiolactone without any additional initiator or catalyst. The Polymerization proceed well in homogeneous manner even at the mild reaction conditions to give a high yield of Polymer (86%). The chemical structure of Polymer was characterized by various instrumental methods to have Polyacetylene Polymer backbone with (N-propionate)pyridium substituents. This zwitterionic Polymer was soluble in such polar protic solvents as water, methanol, DMF, DMSO, N,N-dimethylacetamide, or organic acids capable of hydrogen bonding with the propionate anion. The electrical conductivity of iodine-doped ionic Polyacetylene was 3.4 × 10 −3 S/cm. The photoluminescence spectrum of Polymer showed that the PL peak is located at 490 nm corresponding to the photon energy of 2.53 eV. The cyclovoltammograms of Polymer exhibited the irreversible electrochemical behaviors between the oxidation and reduction peaks. The oxidation current density of Polymer versus the scan rates is approximately linear relationship in the range of 30–120 mV/s. It was found that the kinetics of the redox process of Polymer is almost controlled by the reactant diffusion process from the oxidation current density of Polymer versus the scan rates.
Benjamin R. Boswell - One of the best experts on this subject based on the ideXlab platform.
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Mechanochemical synthesis of an elusive fluorinated Polyacetylene
Nature Chemistry, 2020Co-Authors: Benjamin R. Boswell, Carl M. F. Mansson, Jordan M. Cox, Zexin Jin, Joseph A. H. Romaniuk, Kurt P. Lindquist, Lynette Cegelski, Yan Xia, Steven A. Lopez, Noah Z. BurnsAbstract:Fluorinated Polyacetylene has typically proven to be inaccessible using traditional Polymer synthesis, but there is much interest in its predicted properties. Now, a mechanochemical unzipping strategy has succeeded in the synthesis of a gold-coloured, semiconducting fluorinated Polyacetylene with improved stability in air compared to Polyacetylene. Polymer mechanochemistry has traditionally been employed to study the effects of mechanical force on chemical bonds within a Polymer backbone or to generate force-responsive materials. It is under-exploited for the scalable synthesis of wholly new materials by chemically transforming the Polymers, especially products inaccessible by other means. Here we utilize Polymer mechanochemistry to synthesize a fluorinated Polyacetylene, a long-sought-after air-stable Polyacetylene that has eluded synthesis by conventional means. We construct the monomer in four chemical steps on gram scale, which involves a rapid incorporation of fluorine atoms in an exotic photochemical cascade whose mechanism and exquisite stereoselectivity were informed by computation. After Polymerization, force activation by ultrasonication produces a gold-coloured, semiconducting fluoroPolymer. This work demonstrates that Polymer mechanochemistry is a valuable synthetic tool for accessing materials on a preparative scale.
Yeong-soon Gal - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and properties of an ionic Polyacetylene by the activated Polymerization of 2-ethynylpyridine with the ring-opening of propiolactone
Synthetic Metals, 2011Co-Authors: Yeong-soon Gal, Sung-ho Jin, Young-il Park, Jong-wook Park, Won Seok Lyoo, Kwon-taek LimAbstract:Abstract A new ionic Polyacetylene was prepared by the activated Polymerization of 2-ethynylpyridine with the ring-opening of β-propiolactone without any additional initiator or catalyst. The Polymerization proceed well in homogeneous manner even at the mild reaction conditions to give a high yield of Polymer (86%). The chemical structure of Polymer was characterized by various instrumental methods to have Polyacetylene Polymer backbone with (N-propionate)pyridium substituents. This zwitterionic Polymer was soluble in such polar protic solvents as water, methanol, DMF, DMSO, N,N-dimethylacetamide, or organic acids capable of hydrogen bonding with the propionate anion. The electrical conductivity of iodine-doped ionic Polyacetylene was 3.4 × 10 −3 S/cm. The photoluminescence spectrum of Polymer showed that the PL peak is located at 490 nm corresponding to the photon energy of 2.53 eV. The cyclovoltammograms of Polymer exhibited the irreversible electrochemical behaviors between the oxidation and reduction peaks. The oxidation current density of Polymer versus the scan rates is approximately linear relationship in the range of 30–120 mV/s. It was found that the kinetics of the redox process of Polymer is almost controlled by the reactant diffusion process from the oxidation current density of Polymer versus the scan rates.
Joseph A. H. Romaniuk - One of the best experts on this subject based on the ideXlab platform.
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Mechanochemical synthesis of an elusive fluorinated Polyacetylene
Nature Chemistry, 2020Co-Authors: Benjamin R. Boswell, Carl M. F. Mansson, Jordan M. Cox, Zexin Jin, Joseph A. H. Romaniuk, Kurt P. Lindquist, Lynette Cegelski, Yan Xia, Steven A. Lopez, Noah Z. BurnsAbstract:Fluorinated Polyacetylene has typically proven to be inaccessible using traditional Polymer synthesis, but there is much interest in its predicted properties. Now, a mechanochemical unzipping strategy has succeeded in the synthesis of a gold-coloured, semiconducting fluorinated Polyacetylene with improved stability in air compared to Polyacetylene. Polymer mechanochemistry has traditionally been employed to study the effects of mechanical force on chemical bonds within a Polymer backbone or to generate force-responsive materials. It is under-exploited for the scalable synthesis of wholly new materials by chemically transforming the Polymers, especially products inaccessible by other means. Here we utilize Polymer mechanochemistry to synthesize a fluorinated Polyacetylene, a long-sought-after air-stable Polyacetylene that has eluded synthesis by conventional means. We construct the monomer in four chemical steps on gram scale, which involves a rapid incorporation of fluorine atoms in an exotic photochemical cascade whose mechanism and exquisite stereoselectivity were informed by computation. After Polymerization, force activation by ultrasonication produces a gold-coloured, semiconducting fluoroPolymer. This work demonstrates that Polymer mechanochemistry is a valuable synthetic tool for accessing materials on a preparative scale.