Nouveaux oligomères et polymères conjugués

National audienc

Nouveaux polymères conducteurs fonctionnalisés

National audienc

Synthesis and Chain-Length Dependence of the Electronic Properties of π-Conjugated Dithieno[3,2-b:2′,3′-d]pyrrole (DTP) Oligomers

N-(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]pyrrole has been prepared and its dimer and trimer have been synthesized by Stille coupling. The electrochemical and optical properties of these compounds have been investigated by cyclic voltammetry, UV–Vis, and fluorescence emission spectroscopies. The obtained results show that these strongly luminescent compounds can be oxidized into stable cation radical and dication state. The analysis of the chain length dependence of the electronic properties indicates that the predicted bandgap of an ideal polymer chain should be considerably smaller than the experimental results reported until now. This difference is discussed in terms of reactivity of the dithieno[3,2-b:2′,3′-d]pyrrole (DTP) unit

New Electropolymerizable 3D π-Conjugated Architectures towards Microporous Networks

Date du colloque : 06/2011</p

Nouveaux systèmes pi-conjugués fonctionnels

National audienc

New 3D π-Conjugated Architectures for Electrogenerated Microporous Polymers

Date du colloque : 10/2011</p

Molecular Engineering of the Internal Charge Transfer in Thiophene−Triphenylamine Hybrid π-Conjugated Systems

Introduction of electroaccepting groups at the periphery of triphenylamine-based derivatives leads to an internal charge-transfer band. Syntheses and spectroscopic, electrochemical, and theoretical studies of various derivatives which differ by the strength and the number of electroacceptor groups are presented. These various results show that the ICT band and the acceptor/donor abilities of derivatives can be finely tuned

Organic dye for dye-sensitized solar cells

Organic dye for a dye-sensitized solar cell (DSSC) comprising at least one electron-acceptor unit and at least one π-conjugated unit. Said organic dye is particularly useful in a dye-sensitized photoelectric transformation element which, in its turn, can be used in a dye-sensitized solar cell (DSSC)

A star-shaped triphenylamine π-conjugated system with internal charge-transfer as donor material for hetero-junction solar cells

Introduction of dicyanovinyl groups on a triphenylamine-based conjugated system leads to an intramolecular charge transfer which extends the spectral response and raises the open-circuit voltage of the resulting hetero-junction solar cells