Abstract: A new substituted oligophenylene was prepared by the Knoevenagel condensation of 4-methoxybezaldehyde with a functionalized oligophenylene (OMPA). The latter was obtained by (4-methoxy phenyl) acetonitrile electrochemical oxidation. The resulting modified oligomer was characterized by various spectroscopic techniques: NMR, FTIR and UV. The thermal study showed that the modified material exhibited a lower thermal stability compared with OMPA. Finally, the optical study revealed that in solution, the emission was red-shifted when compared with the non-modified oligomer emission and that the optical gap changed from 3.1 eV to 2.75 eV. In thin layer solid state, photoluminescence was again red-shifted by 120 nm, which is probably due to an interaction between the oligomer chains. In addition, a transient photoluminescence study was undertaken for the synthesized materials. It showed that the lifetimes of the photo-generated species were shortened by the conjugation extension in the modified oligomer and by the inter-chain interactions in the solid state.
Keywords: conjugated polymers; oligophenylenes; photoluminescence
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Amor, S.B.; Said, A.H.; Chemek, M.; Massuyeau, F.; Wéry, J.; Faulques, E.; Alimi, K.; Roudesli, S. Synthesis and Optical Study of a New Oligophenylene. Polymers 2012, 4, 1226-1241.
Amor SB, Said AH, Chemek M, Massuyeau F, Wéry J, Faulques E, Alimi K, Roudesli S. Synthesis and Optical Study of a New Oligophenylene. Polymers. 2012; 4(2):1226-1241.
Amor, Sarra Ben; Said, Ayoub Haj; Chemek, Mourad; Massuyeau, Florian; Wéry, Jany; Faulques, Eric; Alimi, Kamel; Roudesli, Sadok. 2012. "Synthesis and Optical Study of a New Oligophenylene." Polymers 4, no. 2: 1226-1241.