34ethylenedioxythiophene

3,4-ethylenedioxythiophene, commonly abbreviated as EDOT, is a heterocyclic monomer used to make the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT). The molecule features a thiophene ring fused to an ethylenedioxy bridge across the 3 and 4 positions, which increases planarity and electron density, facilitating oxidative polymerization.

EDOT can be polymerized chemically or electrochemically. In chemical methods, oxidants such as iron(III) salts or persulfates are used to form PEDOT. Electrochemical polymerization similarly induces oxidation at an electrode surface. The resulting PEDOT is a conjugated, highly conductive polymer when properly doped with counterions. PEDOT is frequently processed as PEDOT:PSS, a water-dispersible complex with polystyrene sulfonate that enables convenient coatings and film formation.

Applications of EDOT-derived materials are wide and include transparent conductive coatings, antistatic and EMI shielding films, and components in organic electronics such as OLEDs and solar cells. PEDOT and PEDOT:PSS are also used in sensors, electrochromic devices, and energy storage applications due to their combination of conductivity, stability, and flexibility.

Safety and handling considerations for EDOT include irritant effects to skin, eyes, and the respiratory tract; appropriate PPE and ventilation are advised. The polymer PEDOT is chemically stable under typical use conditions. The spelling 34ethylenedioxythiophene is an uncommon or nonstandard variant of the name, with 3,4-ethylenedioxythiophene being the preferred form.