Template Based Soluble CPs

3 TEMPLATE BASED AND SULFONATED CPs 8.3.1 Template Based Soluble CPs 

One of the few CP systems that may possibly qualify as one truly soluble in its more relevant, doped form is a system based on P(ANi) doped with Poly(Styrene Sulfonic Acid) (PSSA) or its salts. This and closely related systems were first described by Malhotra et al. [132] and subsequently studied in more detail by the Yang group 

Apart from the template-based sulfonated systems above very few examples abound of CP systems that may be considered to be truly soluble in doped and undoped forms. One of these is a poly(phenylene vinylene) (P(PV)) derivative reported by the Wudl group [253]. The polymer, prepared via conventional precursor-polymer routes commonly used for P(PV) s, has protonated and metal-salt forms (Fig. 8-2). Films can be cast readily from solution. The metal salt form yields films that readily redissolve in water, but films of the protonated form do not redissolve, apparently due to crosslinldng. The conductivities of films of the protonated and metal salt forms are, respectively, ca. 10 S/cm and 10 S/cm. 

Another sulfonated P(PV) derivative, which has an [0(CH2)3S03(Na/H)] group at both meta positions of every other phenylene ring in P(PV), has been described by the Reynolds group [254]. This was synthesized via a complex route using 1,4-phenyl bisboronic acid and Pd catalysts. As is characteristic for many of the sulfonated CPs, however, it is again highly soluble and processible only in its metal salt form. 

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