Raman Spectroscopic Characterization of Polyselenophenes and Poly(3, 4‐ethylenenedioxyselenophene)s. Issue 5 (2nd April 2014)

• Record Type: Journal Article
• Authors: Ferrón, Cristina Capel; Sheynin, Yana; Li, Mao; Patra, Asit; Bendikov, Michael; López Navarrete, Juan T.; Hernández, Victor; Ruiz Delgado, M. Carmen
• Is Part Of: Israel journal of chemistry. Volume 54:Issue 5/6(2014)
• Page Start: 759
• Page End: 766
• Publication Date: 2014-04-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/ijch.201400024
• Languages: English
• ISSNs: 0021-2148

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Herein we present novel Raman spectroscopic studies carried out for polyselenophene (<bold>PSe</bold>), poly(3, 4‐ethylenedioxyselenophene) (<bold>PEDOS</bold>), and alkyl‐substituted poly(alkyl‐3, 4‐ethylenedioxyselenophene) (<bold>PEDOS</bold>‐<bold>C<italic>n</italic></bold>: <italic>n</italic>=2, 8, and 12) homologues. These spectroscopic data are combined with morphological and structural analysis techniques, such as AFM, and DFT simulations. An investigation into the extent of π‐conjugation in <bold>PSe</bold> is presented by comparing its spectral signatures with those of a homologous series of oligoselenophenes. Our experimental data suggest that π‐conjugation in the <bold>PSe</bold> backbone extends to more than six selenophene units. The incorporation of ethylenedioxy (EDO) groups in <bold>PEDOS</bold> results in a more complex spectrum and a downshift of the CC/CC stretching vibration (or effective conjugation coordinate (ECC) mode); this provides evidence for an improvement in the π‐conjugational properties along the <bold>PSe</bold> backbone upon EDO substitution. The dispersity of π‐conjugation lengths in different <bold>PEDOS</bold> samples obtained through different synthetic routes is evaluated as a function of different structural factors. Finally, we present experimental evidence that the insertion of alkyl chains into the EDO units slightly impacts on the π‐conjugational properties of the <bold>PEDOS</bold> backbone in the non‐annealed samples (with an improved π‐electron delocalization found in <bold>PEDOS</bold>‐<bold>C8</bold>), but moderately affects the degree of molecular order of polymer films upon thermal annealing.</p> </abstract>