Structure properties relationships of liquid crystal bent core organic semiconductors based on benzo[2,1-b:3,4-b′]dithiophene-4,5-dione

Hecham Aboubakr (1) , M.-Gabriela Tamba , Abdou Karim Diallo (2) , Christine Videlot-Ackermann (1) , Lénaïk Bélec (3) , Olivier Siri (1) , Jean-Manuel Raimundo (1) , Georg Mehl , Hugues Brisset (3)

1 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille
2 Department of Applied Physics [Sénégal]
3 MAPIEM - Laboratoire Matériaux Polymères Interfaces Environnement Marin - EA 4323

We report the synthesis of a new diketone bridged dithiophene end-capped with the mesogenic functionalities: 2,7′-bis(alkoxy-biphenyl) and 2,7′-bis(alkoxy-phenyl)-benzo[2,1-b:3,4-b′]dithiophene-4,5-dione. Optical and electrochemical properties in solution were investigated by UV-visible absorption and cyclic voltammetry. Liquid crystal properties of these new materials were investigated by differential scanning calorimetry, optical polarizing microscopy, and X-ray diffraction studies. Both compounds exhibit layered phases though there are differences in the organisation of the phase structures. Thin films were implemented as active layers into organic thin-film transistors to evaluate the charge transport properties.

Domaines: Chimie

Hecham Aboubakr, M.-Gabriela Tamba, Abdou Karim Diallo, Christine Videlot-Ackermann, Lénaïk Bélec, et al.. Structure properties relationships of liquid crystal bent core organic semiconductors based on benzo[2,1-b:3,4-b′]dithiophene-4,5-dione. Journal of Materials Chemistry, 2012, 22 (43), pp.23159. ⟨10.1039/c2jm34803a⟩. ⟨hal-02533180⟩