Examinando por Autor "Harbuzaru, Alexandra"

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Synthesis and electronic properties of nitrogen-doped π-extended polycyclic aromatic dicarboximides with multiple redox processes
(The Royal Society of Chemistry, 2021) Alonso-Navarro, Matías J.; Harbuzaru, Alexandra; Martínez-Fernández, Marcos; Pérez Camero, Paula; López Navarrete, Teodomiro; Ramos, M. Mar; Ponce Ortíz, Rocío; Segura, José L.
In this work, a series of nitrogen-doped polycyclic aromatic mono and dicarboximides was designed, and their synthesis is reported by an innovative synthetic procedure that avoids metal-based crosscoupling reactions. A combined theoretical, electrochemical, optical spectroscopy and material characterization study allows the investigation of the interplay of different effects such as (i) the type of solubilizing chain, (ii) the all-acceptor vs. donor–acceptor nature of the novel systems, and (iii) the molecular ordering, on the ability to stabilize multiple charges and on the OTFT device response characteristics. The amphoteric redox behavior of some of the novel systems allow to obtain ambipolar mobilities while the electron mobility values of the three all-acceptor systems can be rationalized in terms of supramolecular aggregation and enhanced film-forming ability.
Tunable electroactive oligothiophene-naphthalimide semiconductors via end-capped engineering: Cumulative effects beyond the linker
(Royal Society of Chemistry, 2023) Alonso-Navarro, Matías J.; Harbuzaru, Alexandra; Gonzalez- Nuñez, Raúl; Ramos, M. Mar; Segura, José L.; Ponce Ortíz, Rocío
Aiming to obtain novel functional semiconducting materials for their use in organic electronics, the combination of strong donor moieties with electron-withdrawing units is one of the most useful strategies to obtain ambipolar semiconductors with tunable properties. Nowadays most of the efforts headed to efficient materials are based on small changes in the alkyl pendant chains or by replacing single atoms. However, a precise design of new functional materials is still challenging. For this reason, in this work we present a new synthetic approach for achieving redox amphoteric organic semiconductors by tuning their opto-electrochemical properties via rational chemical modifications. All these materials present low-lying LUMO levels, lower than 4.00 eV with broad absorption up to 800 nm in the UV-Vis-NIR spectra. In addition, they have been characterized by DFT, absorption and Raman vibrational spectroscopies, while their charge stabilization abilities are studied by means of spectroelectrochemical techniques. The results point out to a quite complex electronic scenario that goes beyond the expected cumulative effects of the independent molecular units constituting the final molecular assembly.