Control of the Organization of 4,4′-bis Molecular Materials through Siloxane Functionalization

• Published in: Molecules (Basel, Switzerland) Vol. 28; no. 5
• Main Authors: Shaya, Janah, Ribierre, Jean-Charles, Correia, Gabriel, Dappe, Yannick J, Mathevet, Fabrice, Mager, Loïc, Heinrich, Benoît, Méry, Stéphane
• Format: Journal Article
• Language: English
• Published: MDPI AG 01-02-2023
• Subjects: Dielectric films; Siloxanes; Thin films; France
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules28052038

We show that through the introduction of short dimethylsiloxane chains, it was possible to suppress the crystalline state of CBP in favor of various types of organization, transitioning from a soft crystal to a fluid liquid crystal mesophase, then to a liquid state. Characterized by X-ray scattering, all organizations reveal a similar layered configuration in which layers of edge-on lying CBP cores alternate with siloxane. The difference between all CBP organizations essentially lay on the regularity of the molecular packing that modulates the interactions of neighboring conjugated cores. As a result, the materials show quite different thin film absorption and emission properties, which could be correlated to the features of the chemical architectures and the molecular organizations.