Structure-properties relationship of tetrafluorostyrene-based monomers and polymers containing different donor moieties

Publication date: Available online 13 July 2019Source: Reactive and Functional PolymersAuthor(s): Galyna Sych, Jurate Simokaitiene, Ramunas Lygaitis, Egle Jatautiene, Ramin Pashazadeh, Gintaras Buika, Juozas Vidas GrazuleviciusAbstractA new series of monomers consisting of electron-deficient tetrafluorobenzene fragment and electron-donating units such as carbazole, di-tert-butyl carbazole, 9,9-dimethyl acridan and phenothiazine was prepared. Polymers containing well-defined donor-acceptor side chains were obtained via classical free radical polymerization of previously synthesized monomers. Comparative study of photophysical, electrochemical and thermal properties of the synthesized compounds was carried out. It was shown, that emission colour of the compounds from violet to yellow can be effectively adjusted by manipulation of the connected electron-donating fragments. The energy gaps of the compounds can also be fine-tuned by changing the moieties linked to the para-position of pentafluorostyrene moiety. Experimental optical energy gap values varied from 3.57 eV and 3.62 eV for carbazole based monomer and polymer to 2.99 eV and 3.24 for phenothiazine based monomer and polymer. Band gap values of polymers were found to be close to those of the corresponding monomers. The monomers demonstrated violet to yellow fluorescence in the solid state with quantum yields ranging from 1 to 22%. The solid films of polymers demonstrated blue to greenish fluorescence in the region of...

Source: Reactive and Functional Polymers - July 15, 2019 Category: Chemistry Source Type: research