Synthesis and Characterization of a Conducting Organomain Group Polymer,Poly[bis((3,4-ethylenedioxy)-2-thienyl) sulfide]:A Heteroaromatic Relative of Poly(p-phenylene sulfide)

摘要

A contemporary theme in polymer science is the introduction of inorganic elements into polymer backbones,either as wholly inorganic polymers or as "hybrid" materials combining organic and inorganic moieties.This strategy has been particularly attractive in the arena of conjugated organic polymers,in which the novel electronic features inherent in these systems can be modulated by incorporation of nonorganic components into the backbone.One approach has been to incorporate transition-metal-based species into the backbone of conjugated polymers,leading to conjugated "metallopolymers".Alternatively,multicomponent systems from combinations of organic and main group substrates are possible.Polyaniline and its derivatives are arguably the best known examples.Other pi-conjugated/main group polymers have incorporated other elements such as boron,silicon,phosphorus,and arsenic.Among group 16 elements,poly(p-phenylene sulfide) (PPS) derivatives have attracted attention because of the inherent robustness of the parent polymer.The electrical properties of other vinyl or het-eroaryl sulfides have been described but are poorly characterized;the stability of the oxidized (doped) forms of these polymers is poor,thereby hindering their further study or development.Herein we present the synthesis and properties of a new hybrid polymer based on 3,4-ethylenedioxythiophene (EDOT) moieties linked by divalent sulfur.This polymer exhibits excellent electrochemical stability as well as anomalously high conductivity for a formally nonconjugated polymer.