Poly(2,5-bis(3-sulfonatopropoxy)-1,4-phenylene, disodium salt-alt-1,4-phenylene) (PPP-OPSO3) is a water soluble conjugating polymer that can be used as a donor molecule. It has a poly(p-phenylene) skeleton with each repeating unit having two phenylene groups. It can be used for a variety of optoelectronic applications.PPP-OPSO3 is a π-conjugating polymer that can be used in organic light emitting diodes (OLEDs), thin film transistors (TFTs), and flexible organic solar cells.A water-soluble polyanionic blue-light emitting polymer.