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Polythiophenes optical changes

Strong optical changes in polythiophene solutions can also be induced by varying the solvent composition [17,18]. For instance, the addition of methanol (poor solvent) to a solution of poly(3-hexylthiophene) in chloroform (good solvent) results in a yellow to red-violet color change. This phenomenon is again related to a cooperative planar/nonplanar conformational transition of the backbone induced by a variation of the solvent quality. [Pg.698]

Langeveld-Voss, B.M.W. et ah. Inversion of optical activity of chiral polythiophene aggregates by a change of solvent. Macromolecules 31, 6702-6704, 1998. [Pg.400]

Goto, H., Okamoto, Y., and Yashrma, E., Solvent-induced chiroptical changes in supramolecular assemblies of an optically active, regioregular polythiophene. Macromolecules 35, 4590-4601, 2002. [Pg.401]

Thermochromism, the change of colour upon heating, is treated in detail in Chapter 3 of this Handbook. The substituted polythiophenes exhibit this interesting phenomenon, which is manifest in pronounced shifts of the optical absorption spectra, and thus of the band gap, upon temperature variations (Figure 2.17). The... [Pg.110]

The theoretical simulations we have reviewed here are consistent with the changes in optical absorption observed experimentally when the degree of interchain order is improved in alkyl-substituted polythiophene derivatives [60,61]. The CMS spectrum of RR-P3HT exhibits a pronounced charge-induced... [Pg.39]


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Polythiophenes and optical changes

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