title: Not Only Columns: High Hole Mobility in a Discotic Nematic Mesophase Formed by Metal-Containing Porphyrin-Core Dendrimers.
abstract: We report a new family of multifunctional liquid-crystalline porphyrin-core dendrimers that have coumarin functional groups around the porphyrin core. Porphyrin metalation strongly affects the photophysical properties, and therefore ZnIIand CuIIderivatives have also been prepared. All the synthesized dendrimers form a nematic discotic mesophase. Their high tendency for homeotropic alignment makes these dendrimers excellent candidates for device applications, owing to their easy processability, spontaneous alignment between electrodes, and self-healing of defects because of their dynamic nature. The charge mobility values of these materials are the highest ever reported for a nematic discotic phase. Moreover, these values are similar to the highest values reported for ordered columnar mesophases, and this shows that a supramolecular organization in columns is not necessary to achieve high charge mobility.
authors.affiliation: Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Orgánica, Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Concellón
authors.affiliation: Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Orgánica, Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain.
authors.forename: Mercedes
authors.initials: M
authors.lastname: Marcos
authors.affiliation: Instituto de Ciencia de Materiales de Aragón (ICMA), Departamento de Química Orgánica, Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain.
authors.forename: Pilar
authors.initials: P
authors.lastname: Romero
authors.affiliation: Instituto de Nanociencia de Aragón (INA), Departamento de Química Orgánica, Universidad de Zaragoza, 50009, Zaragoza, Spain.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Serrano
authors.affiliation: LASCAMM CR-INSTM, CNR-NANOTEC SS di Rende, Dipartimento di Fisica, Università della Calabria, 87036, Rende, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Termine
authors.affiliation: LASCAMM CR-INSTM, CNR-NANOTEC SS di Rende, Dipartimento di Fisica, Università della Calabria, 87036, Rende, Italy.
authors.forename: Attilio
authors.initials: A
authors.lastname: Golemme
keywords: antenna effect; charge transport; dendrimers; nematic discotic phases; porphyrins