5 research outputs found
Enseñar en Educación Secundaria, un compromiso con la construcción de aprendizajes relevantes y duraderos. Unidades didácticas, secuencias y proyectos, y sus propuestas de evaluación (2019). Parte 4. Propuestas para Lenguajes y Comunicación
Fil: Ferreyra, Horacio Ademar. Universidad Católica de Córdoba. Facultad de Educación; ArgentinaFil: Vidales, Silvia Noemí. Universidad Católica de Córdoba. Facultad de Educación; Argentin
Psicodelia: ecos de un pasado : historia de un movimiento cultural en Chile
Informe de memoria radial para optar al título de PeriodistaEl programa radial “Psicodelia, ecos de un pasado” es un aporte al rescate de las historias tras
una época de la cultura chilena. Desde la llegada del rock a Chile, pasando por el
revolucionado momento que vivía el mundo entero en los años 60, hasta indagar en el fondo de
las motivaciones y sustento de la naciente cultura hippie, el programa hace un recorrido por el
fenómeno psicodélico y el impacto que tuvo en los potentes cambios culturales vividos en la
segunda mitad del siglo XX en Chile. La investigación nace del interés por rescatar el rico
patrimonio musical y sonoro de un momento que definimos como clave en la posterior
construcción de una escena cultural en el país, a pesar del quiebre que supone el golpe de
estado en 1973. ¿Hubo psicodelia en Chile? ¿Cómo vivieron los jóvenes la experimentación
con drogas y la búsqueda de la libertad? ¿Cómo se viven hoy estas manifestaciones? Son
algunas de las preguntas que se ponen en diálogo en este espacio radial, una invitación a
revivir una época y su rico patrimonio musical
Triindole-Bridge-Triindole Dimers as Models for Two Dimensional Microporous Polymers
New dimers with two triindole subunits
bound together through different
linkers (<i>p</i>-phenylene or diacetylene groups) have
been synthesized and studied as model systems to determine the differences
in the electron transfer ability of the two bridging units. Our results
show that whereas a <i>p</i>-phenylene bridge nearly isolates
the two subunits of the dimers a diacetylene bridge allows a high
level of electronic connection between them
Symmetry Lowering in Triindoles: Impact on the Electronic and Photophysical Properties
The electronic and photophysical
properties of 6,11-dihydro-5<i>H</i>-diindolo[2,3-<i>a</i>:2′,3′-<i>c</i>]carbazole, an asymmetric
cyclic dehydrotrimer of indole, have been explored and compared to
its symmetric analogue, 10,15-dihydro-5<i>H</i>-diindolo[3,2-<i>a</i>:3′,2′-<i>c</i>]carbazole (triindole),
a well-known high hole mobility semiconductor. To this purpose, we
use a joint experimental and theoretical approach that combines absorption
and emission spectroscopies, cyclic voltammetry, and spectroelectrochemistry
with DFT calculations. Lowering the symmetry of the triindole platform
causes a red-shift of the absorption edge and emission maxima and
improved the fluorescence quantum yield. Cyclic voltammetry and spectroelectrochemistry
reveal the reversible nature of the two observable oxidation processes
in the alkylated asymmetric triindoles together with an increase in
the stabillity of their oxidized species. On the other hand, the insertion
of alkyl groups on the nitrogen atoms results in a further fluorescence
enhancement although larger reorganization energies are found. DFT
and time-dependent (TD-DFT) calculations successfully support the
experimental data and aid in the understanding of the tuning of the
physicochemical properties of the triindole platform upon symmetry
lowering toward their incorporation in electronic devices
Mobility versus Alignment of a Semiconducting π‑Extended Discotic Liquid-Crystalline Triindole
The
p-type semiconducting properties of a triphenylene-fused triindole
mesogen, have been studied by applying two complementary methods which
have different alignment requirements. The attachment of only three
flexible alkyl chains to the nitrogen atoms of this π-extended
core is sufficient to induce columnar mesomorphism. High hole mobility
values (0.65 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup>) have been estimated by space-charge limited current (SCLC) measurements
in a diode-like structure which are easily prepared from the melt,
rendering this material a good candidate for OPVs and OLEDs devices.
The mobility predicted theoretically via a hole-hopping mechanism
is in very good agreement with the experimental values determined
at the SCLC regime. On the other hand the hole mobility determined
on solution processed thin film transistors (OFETs) is significantly
lower, which can be rationalized by the high tendency of these large
molecules to align on surfaces with their extended π-conjugated
core parallel to the substrate as demonstrated by SERS. Despite the
differences obtained with the two methods, the acceptable performance
found on OFETs fabricated by simple drop-casting processing of such
an enlarged aromatic core is remarkable and suggests facile hopping
between neighboring molecular columns owing to the large conducting/isolating
ratio found in this discotic compound