Polythiophenes based on 3,4-ethylenedioxythiophene

This unique conjunction of properties has given rise to a rich synthetic chemistry aimed at the development of new functional conducting polymers [13, 60, 62, 63]. An overview has been devoted to the electrochemistry of poly(3,4-alkylenedioxthiophene)s [64]. 

This result underlines the major impact of the sulfur atoms of the alkylsulfanyl groups on the steric distortion of the jt-conjugated chain [69]. Further work based on crystallographic, electrochemical and spectroscopic analysis of bis-EDOT, bis-EDST and mixed EDOT-EDST dimers has confirmed this fact. Whereas the solid-state structures of bis-EDOT and EDOT-EDST are planar and almost planar, respectively, bis-EDST presents a median torsion angle of 45° [70]. 

Electron rich or deficient (heterD)arDmatic rings Conjugated systems Metal complexes 

Alkane, polyether chains, crown-ether Electron rich and deficient aromatic rings Redox units, metal complexes. 

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