Oligomer electroactive

J.-F. Morin, N. Drolet, Y. Tao, and M. Leclerc, Syntheses and characterization of electroactive and photoactive 2,7-carbazolenevinylene-based conjugated oligomers and polymers, Chem. Mater., 16 4619-4626, 2004. 

Polaronic and bipolaronic charge states are well known in electroactive polymers, and can be observed in model oligomers with overall delocalization lengths as small as 16 atoms. It has been suggested that localized charge states may be involved in oligomers and polymers having enhanced proper-... 

Work on electroactive TTF-type compounds has continued at a high level and synthesis of such compounds based upon l,3-dithiolane-2,4,5-trithione oligomer has been reviewed <06CHE423>. TTF derivatives with pendant mercaptoalkyl chains have been prepared and their electrochemistry as monolayers on a gold surface examined <0674419>. New dithiole and 77F-type donors prepared and studied include 46 <06711106>, 47 <0682815> and 48 <06H(67)655> while the calculated and experimental Raman spectra of 49 and its Z-isomer have been compared <06SM(156)75>. 8alts of formula (50)2lj have been studied... 

Scheme 11.1 Classification of conductive/ electroactive solids and films, (a) Molecular charge-transfer (CT) complexes and jt-conjugated linear oligomers (b) Mixed electronic-ionic conductors inorganic jt-conjugated polymers and polymer-like...

As shown in Scheme 11.Id, these polymers consist of the main backbone of (i) a nonconductive polymer (25-27), or a polymeric ionomer (29) or (ii) a backbone of an ECP (28) to which pendant, localized redox-centers, such as ferrocene (Fc), bipyridine-complexes of Ru, Os, and so forth, or even low-molecular-weight thiophene oligomers, are covalently attached (25, 27, and 26, respectively). Covalent attachment is characteristic of the structure 28, whereas 29 contains a typical electrostatic bond between the electroactive bipyridine-complex of Ru and the polymeric ionomer s backbone. 

Quartz fibers and Kevlar have also been coated. A uniform adherent, conducting, and electroactive coating is produced using this simple approach. The mechanical properties of the base textile are not significantly affected. The authors suggest that the adherent coating arises from the fact that it is not the monomer or oxidant that is adsorbed onto the textile, but rather the radical and/or oligomers. 

A polythiophene anode in an aqueous electrolytic system, showed irreversible changes at a potential beyond 0.9 V on repeated reduction, suggesting that the breakdown into lower oligomers occurs, as evident from its Raman spectra [268]. However, the loss of electroactivity, electrical conductivity, electrochromic properties, mechanical properties, compact morphology... 

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