title: Luminescent liquid crystalline materials based on palladium(II) imine derivatives containing the 2-phenylpyridine core.
abstract: In this work we report our studies concerning the synthesis and characterisation of a series of imine derivatives that incorporate the 2-phenylpyridine (2-ppy) core. These derivatives were used in the cyclometalating reactions of platinum(II) or palladium(II) in order to prepare several complexes with liquid crystalline properties. Depending on the starting materials used as well as the solvents employed, different metal complexes were obtained, some of them showing both liquid crystalline behaviour and luminescence properties at room temperature. It was found that, even if there are two competing coordination sites, the cyclometalation process takes place always at the 2-ppy core with (for Pt) or without (for Pd) the imine bond cleavage. We successfully showed that it is possible to prepare emissive room temperature liquid crystalline materials based on double cyclopalladated heteroleptic complexes by varying the volume fraction of the long flexible alkyl tails on the ancillary benzoylthiourea (BTU) ligands.
authors.affiliation: Department of Inorganic Chemistry, University of Bucharest, 23 Dumbrava Rosie st, sector 2, Bucharest 020464, Romania. viorel_carcu@yahoo.com viorel.circu@g.unibuc.ro.
authors.forename: Marin
authors.initials: M
authors.lastname: Micutz
authors.forename: Monica
authors.initials: M
authors.lastname: Iliş
authors.forename: Teodora
authors.initials: T
authors.lastname: Staicu
authors.forename: Florea
authors.initials: F
authors.lastname: Dumitraşcu
authors.forename: Iuliana
authors.initials: I
authors.lastname: Pasuk
authors.forename: Yann
authors.initials: Y
authors.lastname: Molard
authors.forename: Thierry
authors.initials: T
authors.lastname: Roisnel
authors.forename: Viorel
authors.initials: V
authors.lastname: Cîrcu