Synthesis of structure-defined conjugated polymers directly bound to porphyrins

Kenichi Oyaizu, Manabu Hoshino, Takuya Imai, Hidenori Murata, Makoto Yuasa

研究成果: Paper

抄録

5-(3-Thienyl)-10,15,20-triethyl-21H,23H-porphine was prepared by the ring closure of pyrrole and a 3:1 mixture of propionaldehyde and 3- thiophenecarbaldehyde. Oxidative polymerization of the porphyrin with typical oxidants such as FeCl3 gave a polythiophene derivative bearing porphyrins directly bound to the β-position of the main chain. The very bulky β-substituents allowed the polymerization to proceed regioselectively even at room temperature, resulting in the formation of the β-substituted polythiophene with an HT-HT content of more than 90%. The porphyrin substituents aligned cofacially along the main chain, which served as the catalytic site for the four-electron reduction of O2 to H2O (O2 + 4e- + 4H+ = 2H2O) when cobalt ions were introduced into the porphyrins. A novel platinum-free catalyst for the reduction of O2 for fuel cell cathodes, 1/CB (M = CoII), was thus prepared by the electropolymerization of the porphyrin at the surface of carbon black (CB), which reduced O2 with four electrons at more poritive potentials than the standard two-electron reduction potential of O2 to H2O2.

本文言語English
ページ3030-3031
ページ数2
出版ステータスPublished - 2006 12 1
外部発表はい
イベント55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
継続期間: 2006 9 202006 9 22

Other

Other55th Society of Polymer Science Japan Symposium on Macromolecules
CountryJapan
CityToyama
Period06/9/2006/9/22

ASJC Scopus subject areas

  • Engineering(all)

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