Syntheses and electrical properties of halogen substituted PPV derivatives

Summary form only given. Halogen substituted PPV derivatives (PFPV, PClPV, FBrPV, PIPV) were prepared in film form from water soluble precursor route. The properties of these polymers were studied by UV-visible spectroscopy and electrical conductivity. According as phenylene ring was combined from fluorine to iodine, the position of maximum absorption shifts to the longer wavelength region. This indicates that the substituents halogen cause a bathochromic shift with changing from strong electron-withdrawing fluorine to weak electron-withdrawing iodine. The maximum absorptions and absorption edges due to /spl pi/-/spl pi/* transition of the polyconjugated systems show 400-430 nm and 510-530 nm, respectively. The electrical conductivity values of FeC1/sub 3/-doped polymer films are in the range of 10-sup -3/ S/cm and the drawn (L/L//sub /spl ring// = 5) ones are in the range of 10/sup -1/ S/cm. As the substituents are changed from fluorine to iodine, the conductivity values slightly increase because of their electronic and morphological effect.