Advances In Synthetic Metals. Twenty Years of Progress in - download pdf or read online

By Bernier P. (ed.), Lefrant S. (ed.), Bidan G. (ed.)

ISBN-10: 0444205322

ISBN-13: 9780444205322

ISBN-10: 0444720030

ISBN-13: 9780444720030

ISBN-10: 0444720049

ISBN-13: 9780444720047

ISBN-10: 0444720057

ISBN-13: 9780444720054

This edited paintings includes 8 large, review-type contributions through prime scientists within the box of man-made metals. The authors have been invited via the organisers of the overseas convention on technology and expertise of artificial Metals '98 (ICSM'98) to check the development of study long ago 20 years in a unifying and pedagogical demeanour. the current paintings highlights the state of the art of the sphere and assesses the customers for destiny examine.

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Kovacic reported on the synthesis of phenyl- and benzyl-substituted poly(N-methylpyrrole)s starting from the corresponding 2,5-dibromopyrroles 110 (scheme 27), R Kovacic + B r ~ B r I CH3 Mg + Ni(ll) - M gBr2 - Ni(I) R = Ph, -CH2Ph 110 Scheme 27 Kovacicmethod for the preparation of PAPys. I R 52 Advances in Synthetic Metals which were converted into the analogous Grignard compounds and oxidatively coupled by more than stoichiometric amounts of Ni(II)-complexes [170]. The molecular weight of these PPys is reported to be quite limited.

1 20 Years of "Synthetic Metals" 25 This problem could be limited by the use of dialkoxy-substituted benzenes or bridged biphenyl compounds, such as fluorene [93] and tetrahydropyrene [94]. Thereby, the two ortho-positions of neighboring benzene rings are bridged by saturated sp3-centers. This slight structural change not only reduces the conformational mobility of the chain, but also allows attachment of solubilizing alkyl chains without steric inhibition of resonance. While the resulting polymers polyfluorene 49 and polytetrahydropyrene 50 can be termed step-ladder polymers (see chart 10), a logical extension led to the synthesis of perfect ladder polymers 52 possessing a true, double-stranded structure [95].

Q 55 54 - CO Autoclav, 200~ toluene n Scheme 9 Synthesisof polyphenylenes via Diels-Alder reaction. ,psx; ‘H // 57 \ o \ R A 58 k w Scheme 10 Synthesis of generation 1 of polyphenylene dendrimers. W Advances in Synthetic Metals 30 ~IPS ~Pi~]~ TlTlPi~] 59 Chart 11 AB2-buildingblock giving access to hyperbranched dendrimers. 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].

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Advances In Synthetic Metals. Twenty Years of Progress in Science and Technology by Bernier P. (ed.), Lefrant S. (ed.), Bidan G. (ed.)

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