Fullerene helical polymer

As stated, this has been the last family to appear since the first example was reported in 1999 by the group of Dai, regarding the significant enhancement in the conduction experienced by polyanilines when mixed with polysulfonated fullerene [54]. Recently, other interesting examples of supramolecular helical polymers have been reported (Chapter 6) [55] as well as head-to-tail donor-acceptor supramolecular polymers based in concave-convex interactions [56]. 

Figure 6.1 Schematic illustration of fullerene-containing helical polymers, (a) and (b), and fullerene-encapsulated helical polymers (c).

Helical Polymers with Pendant Fullerenes via Covalent Bonds 131... 

Figure 6.5 (a) Schematic representation of the macromolecular helicity induction on poly(1 -co-5 ) upon complexation with L-alanine. The achiral fullerene and crown ether pendants represented by yellow and blue rings for clarity arrange in a helical array along the one-handed helical polymer backbone induced by noncovalent chiral interactions with L-alanine. (b) CD spectra of poly(1o.i-co-5o,) with L- and o-Ala HClO ([Ala-HCl04]/[poly(1o.,-co-5o,)] = 2) in dichloromethane-acetonitrile (8/2, v/v) at 25... 

Helical Array of Fullerenes along Helical Polymer Backbone via Noncovalent Bonds 137... 

Poly(cis-phenylacetylene) adopts a helical structure due to steric interaction of the phenyl rings. Chiral [60]fullerene-bisadduct 19 is complexed with anionic polyphenylacetylene 18 to form a fullerene nano-array on the polymer main chain, which induce its macromolecular helicity (Figure 9.22) [95]. Induchon of helicity is sensitive to the geometry of the [60]fullerene-bisadducts. The trans-3 adduct 19 transfers its chiral information onto the macromolecular helicity, whereas trans-2 and cis-3 do not (see Chapter 6 for more details of fullerene-containing helical polymers). 

Also, chiral fullerene derivatives have found use in biological applications [50] and in polymer science as helicity inducers [51]. Recently, fullerene chirality has demonstrated to be critical in generating a supramolecular architecture of donor-acceptor dyads (based in a chiral pyrrolidino[60]fullerene) giving rise to photoconductive nanofibers displaying very high ambipolar charge-carrier mobility ( 10 cm /(V s)), which was higher than that obtained from racemic dyads in spherical assembly [52]. 

Figure 8.10 Possible helical structures of a copolymer of achiral and chiral bounded phenylacetylenes. Space filling models are shown of the top (i) and side views (ii). The polymer backbones are shown in orange and the pentadecyl groups are omitted for clarity. The main chains have a right-handed helical structure. The fullerene units are arranged in right-handed (a) and left-handed helical arrays (b). The helix-sense of the main-chain is...

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