Synthesis and Optical Study of a New Oligophenylene

Polymers

Sarra Ben Amor²  Ayoub Haj Said²  Mourad Chemek³  Florian Massuyeau¹  Jany Wéry¹  Eric Faulques¹  Kamel Alimi³ 

[1] Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, UMR 6502, 2 rue de la Houssinière, B.P. 32229, 44322 Nantes, Cedex 03, France;Laboratoire Polymères, Biopolymères, Matériaux Organiques, Faculté des sciences, Université de Monastir, Boulevard de l’environnement, 5000, Tunisia;Unité de Recherche, Matériaux Nouveaux et Dispositifs Electroniques Organiques, Faculté des Sciences, Université de Monastir, Boulevard de l’environnement, 5000 Monastir, Tunisia;

关键词: conjugated polymers;    oligophenylenes;    photoluminescence;   

DOI  :  10.3390/polym4021226

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.