Synthesis of 3,4-propylenedioxythiophene based electrochromic polymers and investigation of their optoelectronic properties

Nowadays conjugated polymers have priority over their inorganic analogues in advanced technological applications. The main reason for this, both conductivity and outstanding properties of the polymers appear in a single material. One of the outstanding properties of these materials is that, designing the monomer structure, allows polymer's properties to be adjusted. Many different strategies have been used to synthesize monomers, however, the most useful method is the Donor-Acceptor-Donor (D-A-D) method. With the help of this method, it is possible to lower the band gap or to adjust the HOMO and LUMO levels of the polymers. In this thesis study, two novel monomers, 9,10-bis(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)anthracene (1) and 2,6-bis(3,3-didecyl-3,4-dihydro-2H- thieno [3,4-b] [1,4]dioxepin-6-yl)-4,4-dioctyl-4H-silolo[3,2-b:4,5-b']dithiophene (2), designed according to D-A-D method were synthesized and characterized by 1H NMR, mass or 13C NMR spectroscopies. Then electrocopolymerization of monomer 1 with 3,4-ethylenedioxythiophene and electrohomopolymerization of 2 were carried out. Electrochemical and optical properties of the obtained electrochromic polymers were investigated.