Regioregular poly derivatives

The crystalline composites obtained between poly(3-alkylthiophene) and polystyrene showed an enhanced conductivity (07MM6579). The preparation of regioregular poly(3-alkylthiophene) and perylene diimide derivatives composites have been reported (06MI384). The photoluminescence spectra of this type of composites exhibit a significant photoluminescence quenching of the perylene diimide derivative. This result implies that the light absorbed by the perylene diimide units could also contribute to the generation of current at the photovoltaic device. 

Regioregular poly(3,4-cycloalkylthiophene) derivatives, such as 536, have been reported (03JA5286). 

The cyclic voltammetry of poly(3 (2-methyl>I>buto >4>metylthiophene)[2P] (PMBMT), a polymer that can be obtained either in a pkmar or non-planar form at room temperature, is drown in Figure 11. The planar (violet) form has an oxidation potential of +0.70 V vs SCE while the non-planar (yellow) form has an oxidation potential of +0.88 V vs SCE. At a potential of +0.65 V, there is almost a 200-fold increase in the measured current giving rise to a very simple way of quantifying electrochemically the different field-induced chromic transitions of regioregular polythiophene derivatives[45]. 

Guillerez and Bidan [604] recently described a new synthesis of highly regioregular poly(3-octyl-thiophene) based on the Suzuki coupling reaction. The stable polymerizable precursor which bore an iodo and boronic ester derivative in the 2 and 5 positions was obtained in two steps from the 3-octyJ monomer. Polymerization of this in the presence of Pd(II) acetate gave a final CP said to contain up to 97% of head-to-tail couplings. This synthesis is summarized in Fig. 14-4. 

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