Browsing by Author "Malacrida, Claudia"

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    Electrochemical crosslinking strategies using redox-active units for optoelectronic thin film applications
    (2023) Malacrida, Claudia; Ludwigs, Sabine (Prof. Dr.)
    In this dissertation the electrochemical reactivity of different classes of redox molecules of optoelectronics interest, including thiophene and arylamine derivatives, is studied and exploited to crosslink precursor systems endowed with multiple dimerization sites to obtain functional electroactive films. The latter are characterized by a well-defined and controlled π-conjugation and redox behavior, which can be directly related to the one of the dimer of the starting redox unit. In the first section of the thesis, the electrochemical crosslinking from solution of different multimeric systems, including arylamine based push-pull molecules was exploited. In the second part of the thesis, insight of oxidative crosslinking as a post-solution deposition step to obtain electroactive films is provided. The dimerizing ability of triarylamine (TPA) and carbazole (Cbz) in the form of redox-active pendant units on a saturated polymer backbone as crosslinkers was studied upon oxidation.
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    In situ electrochemical investigations of inherently chiral 2,2′‐biindole architectures with oligothiophene terminals
    (2021) Malacrida, Claudia; Scapinello, Luca; Cirilli, Roberto; Grecchi, Sara; Penoni, Andrea; Benincori, Tiziana; Ludwigs, Sabine
    The synthesis and characterization of three new inherently chiral N,N′‐dipropyl‐3,3′‐diheteroaryl‐2,2′‐biindole monomers, nicknamed Ind2T4, Ind2T6 and Ind2Ph2T4, which differ in the number of thiophenes as terminals, are reported. In addition to a full monomer characterization, stable electroactive oligomeric films were obtained by electro‐oxidation upon cycling to potentials which activate the thiophene terminals. Cyclic voltammetry, UV‐Vis‐NIR spectroelectrochemistry and in situ conductance measurements show that oligomeric films of Ind2T6 present the best stability and electrochromic switching performance. Enantioselective tests with a chiral ferrocene amine clearly show the potential as chiral selectors for analytical and sensing purposes.