Substituted P Ac s

Substituted P(Ac)s may be synthesized using a wide variety of methods, primarily condensation polymerizations. Fig. 13-5 shows a sampling of these. Poly(phenyl acetylene) (P(PhAc)), a typical substituted P(Ac), is soluble in its undoped state in common organic solvents [563]. 

Examples of variety of methods available for substituted P(Ac) synthesis. After Reference [88], reproduced with permission. 

36-100% yield IcyLlunvr Ob tupruduc-tl (by light scattering) 21 IO32-10  

Typical schemes for polymerization of P(DiAc)s, and the structural difference between P(Ac)s and P(DiAc)s, are shown in Fig. 13-6. 

they could be made soluble in their undoped form, and that they could be doped [264, 566]. P(DiAc)s are typically named on the basis of die substituents R, R used. Some of the most common P(DiAc)s, and several others, are listed in Fig. 13-7 below. Many P(DiAc)s display thermochromism and solvatochromism (color changes based on temperature and solvent composition changes), e.g. yellow to red or blue. [567]. Indeed a thermochromic shift in Raman spectra has been observed. Photocurrent behavior in single crystals of PTS and MADF, two P(DiAc)s witli different substituent groups (Fig. 13-7 is very different [568], demonstrating the strong influence of the substituent groups in this class of CPs. 

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