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  • Náhled
    Item type:Článek, listelement.badge.peer-reviewedpeer-reviewed, listelement.badge.statuspublishedAccess status: open access ,
    Controlling emissive behaviour through molecular design: 2,3-bis(2,5-dimethylthiophen-3-yl)quinoxalines with variable fluorene substitution
    (Royal Society of Chemistry (RSC), 2025) Loghina, Liudmila; Jančálek, Jiří; Houdek, Jakub; Zmrhalová, Zuzana; Jambor, Roman; Vlček, Miroslav
    We report a new family of donor–acceptor–donor (D–A–D) chromophores based on 2,3-bis(2,5-dimethyl thiophen-3-yl)quinoxaline, where the electronic and steric environment is tuned through fluorene substituents at the 5,8-positions. Variation of the 9,9-substituents (aryl, branched alkyl, and spiro-linked groups) enables systematic modulation of solubility, conformational rigidity, and intermolecular interactions while preserving the electron-deficient quinoxaline core. All synthesized derivatives (DMTQ1–DMTQ5) exhibit characteristic p–p* absorption around 380 nm and broad intramolecular charge-transfer (ICT) emission in solution (490–502 nm) with photoluminescence quantum yields up to 45% and lifetimes of 2.7–4.0 ns. A detailed solvatochromic and time-resolved study of DMTQ5 confirmed strong ICT character, manifested by red-shifted emission and polarity-dependent lifetime shortening. Electrochemical studies reveal consistent oxidation onsets (0.54–0.64 V vs. Fc/Fc+), corresponding to HOMO levels of 5.34 to 5.44 eV, while LUMO energies ( 2.57 to 2.67 eV) were derived from optical gaps of B2.8 eV. In the solid state, spin-coated films of selected derivatives exhibit pronounced photochromic switching of emission colour and intensity, a behaviour absent in solution and directly demonstrated using UV-LED excitation. These results establish fluorene substitution as a versatile strategy to direct emissive behaviour in quinoxaline-based chromophores, highlighting their potential as polarity-sensitive probes, light-responsive coatings, and optoelectronic materials.
  • Náhled
    Item type:item.dctype.ověřená technologie, Access status: Omezený přístup ,
  • Náhled
    Item type:Článek, listelement.badge.peer-reviewedpeer-reviewed, listelement.badge.statuspublishedAccess status: open access ,
    Participatory sense-making in deep disagreements: enriching multi-modal theory of argumentation with the enactive approach to linguistic bodies
    (Elsevier BV, 2026-07) Candiotto, Laura; Kiš, Serhij
    Deep disagreements – conflicts that concern issues of existential importance – pose a challenge for traditional argumentation theories. This paper explores how such disagreements unfold in dialogical exchanges, particularly in emotionally and existentially charged contexts. Using the movie We Live in Time (2024) as a case study of deep disagreement on procreation, we note that the multi-modal theory of argumentation seems initially promising but is ultimately limited as far as overcoming deep disagreements is concerned. This paper aims to remedy these limits of multi-modal argumentation by utilizing the enactive tool of participatory sense-making. While multi-modal argumentation facilitates resolution through mutual understanding and seeking of interlocutor’s shared grounds in most mundane disagreements, we argue that it remains insufficient in deep disagreements. This is because in deep disagreements the shared grounds between the interlocutors' respective positions are missing. By discussing qualitative sociological research on reproductive decision-making, we argue that what is needed in such cases is co-creation of new meanings between interlocutors. We propose integrating the enactive approach to participatory sense-making with multi-modal argumentation and we test the efficacy of this intervention by analyzing some crucial scenes of We Live in Time. Our final picture explains how participatory sense-making can help couples transform their deep disagreements into new meanings over a span of a shared form of life.
  • Náhled
    Item type:item.dctype.funkční vzorek, Access status: Omezený přístup ,
  • Náhled
    Item type:Časopis, listelement.badge.peer-reviewedpeer-reviewed, listelement.badge.statuspublishedAccess status: Omezený přístup ,
    2026/1 Ošetrovateľstvo a pôrodná asistencia
    (Slovenská komora sestier a pôrodných asistentiek, 2026)