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3 results on '"Robert Forschner"'

1. Luminescent liquid crystals: from supramolecular plant dyes to emissive flavylium salts

Author

Robert Forschner, Julius Agamemnon Knöller, Anna Zens, Wolfgang Frey, Yann Molard, Sabine Laschat, Universität Stuttgart [Stuttgart], Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Bundesministerium fuer Bildung und Forschung [01 R1 05177], Deutsche Forschungsgemeinschaft [La 907/17-2, La 907/20-1], German Academic Exchange Service [PHC Procope], Ministerium fuer Wissenschaft, Forschung und Kunst Baden-Wuerttemberg, Carl-Schneider-Stiftung, and Studienstiftung des Deutschen Volkes

Subjects
Xray, liquid crystals, [CHIM]Chemical Sciences, General Materials Science, General Chemistry, ionic liquid crystals, Condensed Matter Physics, Flavylium salts
Abstract

Accepted manuscript / Clean copy; International audience; Inspired by the supramolecular architecture of cornflower blue we developed luminescent flavylium salts with lipophilic alkoxy or thioether side chains which self-assemble into liquid crystalline phases. The current account highlights some fundamental aspects of our biological 'role model' anthocyanine, the origin of the natural pigment cornflower blue, and our recent developments on novel liquid crystalline emissive dyes. Starting with the general synthesis of flavylium salts, other topics address variations of flavylium ILCs, including specific tuning of their mesomorphic and photophysical behaviour.

Published
2023
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2. Self-Assembly and Fluorescence of Tetracationic Liquid Crystalline Tetraphenylethene

Author

Wolfgang Frey, Kevin Schweizer, Yann Molard, Sabine Laschat, Robert Forschner, Andrea Bühlmeyer, Frank Giesselmann, Jakob Knelles, Stuart J. Beardsworth, Johanna R. Bruckner, Korinna Bader, Universität Stuttgart [Stuttgart], Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synthèse Caractérisation Analyse de la Matière (ScanMAT), Université de Rennes (UR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), DFG [LA 907/20-1 SNAPSTER], ANR [ANR-18-CE92-0026], Fonds der Chemischen Industrie (Kekule fellowship), Carl-Schneider Stiftung Aalen, ANR-18-CE92-0026,SNAPSTER,Nanomatériaux supramoléculaires contenant des clusters métalliques luminescents(2018), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, aggregation-induced emission, Ionic bonding, Mesophase, tetraphenylethene, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Crystallography, Differential scanning calorimetry, liquid crystals, Liquid crystal, Phase (matter), Side chain, [CHIM]Chemical Sciences, Self-assembly, fluorescence, Physical and Theoretical Chemistry, 0210 nano-technology, Luminescence, ionic self-assembly
Abstract

International audience; A series of tetraguanidinium tetraphenylethene (TPE) arylsulfonates with different chain lengths was prepared via ionic self‐assembly of tetraguanidinium TPE chloride and the respective methyl arylsulfonates. Liquid crystalline properties were studied by differential scanning calorimetry, polarizing optical microscopy and X‐ray diffraction. Tetraguanidinium TPE arylsulfonates with chain lengths of C8–C12 displayed hexagonal columnar mesophases over a broad temperature range, while derivatives with longer chains showed oblique columnar phases. In solution all compounds displayed aggregation‐induced emission behaviour. Temperature‐dependent luminescence spectra of the bulk phase of the tetraguanidinium TPE arylsulfonate with C14 side chains revealed a strong luminescence both in the solid state and the oblique columnar mesophase. The emission behaviour was rationalized by a unique combination of restriction of intramolecular rotation of the TPE core, Coulomb interaction between the guanidinium cations and π–π interactions of the anionic arylsulfonate moieties.

Published
2019
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3. Luminescent liquid crystalline hybrid materials by embedding octahedral molybdenum cluster anions with soft organic shells derived from tribenzo[18]crown-6

Author

Andrea Bühlmeyer, Claire Roiland, Noée Dumait, Sabine Laschat, Philipp Ehni, Robert Forschner, Yann Molard, Max Ebert, Korinna Bader, Kevin Guy, Stuart J. Beardsworth, Institut für Organische Chemie, Universität Stuttgart [Stuttgart], Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Synthèse Caractérisation Analyse de la Matière (ScanMAT), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut de Chimie du CNRS (INC), PPP Procope program PLISE, Deutscher Akademischer Austauschdienst, ANR Clustomesogen ANR-13-BS07-0003-01, Agence Nationale de la Recherche, Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg, shared instrumentation grant # 01 RI 05177, Bundesministerium für Bildung und Forschung, ANR-13-BS07-0003,CLUSTOMESOGEN,Cristaux liquides hybrides organiques-inorganiques luminescents contenant des clusters octaédriques de métaux de transition(2013), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Lanthanide, Materials science, 010405 organic chemistry, 18-Crown-6, Supramolecular chemistry, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Scholl reaction, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Octahedron, Polymer chemistry, Cluster (physics), [CHIM]Chemical Sciences, Hybrid material, Ternary operation
Abstract

International audience; Crown ethers and their derivatives are versatile building blocks for the design of supramolecular materials. They can be functionalized at will and are well known for their abilities to complex with alkali cations. Here, we show that emissive lanthanide free hybrid materials can be generated by using such building blocks. The organic tribenzo[18]crown-6 central core was functionalized via six-fold Suzuki cross-coupling as a key reaction with three o-terphenyl units which could be converted into their corresponding triphenylenes by the Scholl reaction, leading to novel liquid-crystalline columnar materials. Selected tribenzo[18]crown-6 o-terphenyls could interact with emissive ternary metal cluster compound salts to generate hybrid materials combining the properties of both moieties. Due to synergistic effects and despite the anisometry of the cluster compounds, individual properties such as liquid-crystalline phase stability of the organic part and emission abilities of its inorganic counter-part are enhanced in the hybrid compounds.

Published
2018
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