About some properties of new poly(phenylene vinylene) derivatives: PPV-ether and C1–4PPV-ether

Although, the presence of the substituted groups induce a difference in physical and chemical properties of the co-polymer, it does not affect its symmetry group. We deduce from IR and RRS analyses of C1–4PPV-ether, compared to those of PPV-ether, that the geometrical structural modifications with a decrease in the planarity of the chain and the vibrational features are possibly ascribed to conformational effects. The molecular packing effect is also outlined. Moreover, the decrease of the optical gap and the higher energy shifted transition could be assigned to the different lattice relaxations and vibrational behaviors shown by this co-polymer. Added to IR, RRS and optical density results, the PL measurements prove a great delocalization of π-electron system with a red shifted emission.