title: Functional carbazole liquid-crystal block codendrimers with optical and electronic properties.
abstract: The synthesis and characterisation of a family of block codendrimers consisting of highly versatile mesogenic and carbazole-containing 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) dendrons are reported. The liquid-crystal behaviour was investigated by means of differential scanning calorimetry, polarised-light optical microscopy and X-ray diffraction. Depending on the chemical structure of the constituent dendrons, the codendrimers show lamellar or columnar mesophases. On the basis of the experimental results, models both at the molecular level and in the mesophase are proposed. The physical properties of the block codendrimers derived from the presence of the carbazole moiety in their structure were investigated: photoluminescence in solution and in the mesophase, electrochemical behaviour and hole transport. Electrodeposition of carbazole dendrons afforded a globular supramolecular conformation in which the mesogenic molecular side plays a key role.
authors.affiliation: Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón - CSIC, Universidad de Zaragoza, C/Pedro Cerbuna, 50009 Zaragoza (Spain).
authors.forename: Ismael
authors.initials: I
authors.lastname: Gracia
authors.forename: Beatriz
authors.initials: B
authors.lastname: Feringán
authors.forename: José Luis
authors.initials: JL
authors.lastname: Serrano
authors.forename: Roberto
authors.initials: R
authors.lastname: Termine
authors.forename: Attilio
authors.initials: A
authors.lastname: Golemme
authors.forename: Ana
authors.initials: A
authors.lastname: Omenat
authors.forename: Joaquín
authors.initials: J
authors.lastname: Barberá
keywords: charge transport; dendrimers; electrodeposition; liquid crystals; mesophases