Used primarily as a monomer precursor in the synthesis of conductive polymers, especially poly(3,4-ethylenedioxythiophene) (PEDOT). It enables the production of water-soluble and processable forms of PEDOT when combined with polyelectrolytes like polystyrene sulfonate (PSS). These conductive materials are key components in organic electronic devices such as organic light-emitting diodes (OLEDs), organic solar cells, and organic field-effect transistors. Also employed in antistatic coatings, transparent electrodes, and electrochromic devices due to its excellent conductivity, optical transparency, and environmental stability. Its carboxylic acid functional groups allow for chemical modification and improved solubility, facilitating integration into various matrices and enhancing film-forming properties in industrial applications.