By P. Bernier
This edited paintings comprises 8 large, review-type contributions through top scientists within the box of artificial metals. The authors have been invited through the organisers of the foreign convention on technological know-how and know-how of artificial Metals '98 (ICSM'98) to check the growth of study some time past twenty years in a unifying and pedagogical demeanour. the current paintings highlights the cutting-edge of the sphere and assesses the customers for destiny learn.
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Additional resources for Advances in Synthetic Metals: Twenty years of progress in science and technology
Naphthalene has a different reduction potential from that of benzene and hence allows a modification of the band structure (color tuning). The work of Davidov and Avny demonstrates the possibility of color tuning in LED devices by (i) varying the chemical composition of the copolymers, (ii) controlling the film thickness of the copolymer, and (iii) varying the external applied voltage. Another route to poly(naphthalenevinylene) 69 comprises the ring-opening metathesis reaction (ROMP) of benzobarrelene derivatives 67 followed by oxidation of the soluble precursor polymer 68 (scheme 12) .
4. Polyphenylenevinylenes and polyphenyleneethynylenes The most popular way of making poly-para-phenylenevinylene (PPV) 17 comprises a precursor route introduced by Wessling and Zimmermann [ 10]. The starting compounds are sulfonium salts available from the reaction of ot,oL'dihalogenated-xylene with acyclic or non-cyclic aliphatic thioether, which are subjected to a base-induced polymerization, yielding the water-soluble precursor polyelectrolyte 63. The mechanism of the reaction has been intensively studied , whereby 1,6-elimination from 61 yielding a quinoid intermediate 62 is certainly one important step (see scheme 11).
A huge number of differently substituted PTs have been synthesized, characterized, and their scope for potential applications has been tested. A complete and detailed review of this vast scientific research is far beyond the limits of this text, interested readers are refered to the literature [ 148]. The synthesis of oligothiophenes has become more and more important since it was found that some of their physical properties even surpass those of the polymers. An example for the importance of oligomer synthesis is the all oLlinked sexithiophene, which has been used in an organic field-effect transistor and in a light modulating device due to the superior charge carrier mobility compared to the polymer .
Advances in Synthetic Metals: Twenty years of progress in science and technology by P. Bernier