title: New 3pi-2spiro ladder-type phenylene materials: synthesis, physicochemical properties and applications in OLEDs.
abstract: New routes to ladder-type phenylene materials 1 and 2 are described. The oligomers 1 and 2, which possess a "3pi-2spiro" architecture, have been synthesized by using extended diketone derivatives 3 and 10 as key intermediates. The physicochemical properties of the new blue-light emitter 2 were studied in detail and compared with those of the less-extended 1. Owing to the recent development of fluorenone derivatives and their corresponding more conjugated analogues as potential electron-transport materials in organic light-emitting diodes (OLEDs) and as n-type materials for photovoltaic applications, we also report herein the thermal, optical and electrochemical behavior of the key intermediates, diketones 3 and 10. Finally, the application of dispiro 2 as a new light-emitting material in OLEDs is reported.
authors.affiliation: Université de Rennes 1, UMR CNRS 6226 Sciences Chimiques de Rennes, Bat 10C, Campus de Beaulieu, 35042 Rennes Cedex, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Cocherel
authors.forename: Cyril
authors.initials: C
authors.lastname: Poriel
authors.forename: Joëlle
authors.initials: J
authors.lastname: Rault-Berthelot
authors.forename: Frédéric
authors.initials: F
authors.lastname: Barrière
authors.forename: Nathalie
authors.initials: N
authors.lastname: Audebrand
authors.forename: Alexandra M Z
authors.initials: AM
authors.lastname: Slawin
authors.forename: Laurence
authors.initials: L
authors.lastname: Vignau