Ionothermal Synthesis of Imide‐Linked Covalent Organic Frameworks

Maschita, Johannes; Banerjee, Tanmay; Savasci, Goekcen; Haase, Frederik; Ochsenfeld, Christian und Lotsch, Bettina V. (2020): Ionothermal Synthesis of Imide‐Linked Covalent Organic Frameworks. In: Angewandte Chemie, Bd. 132, Nr. 36: S. 15880-15888

Abstract

Covalent organic frameworks (COFs) are an extensively studied class of porous materials, which distinguish themselves from other porous polymers in their crystallinity and high degree of modularity, enabling a wide range of applications. COFs are most commonly synthesized solvothermally, which is often a time‐consuming process and restricted to well‐soluble precursor molecules. Synthesis of polyimide‐linked COFs (PI‐COFs) is further complicated by the poor reversibility of the ring‐closing reaction under solvothermal conditions. Herein, we report the ionothermal synthesis of crystalline and porous PI‐COFs in zinc chloride and eutectic salt mixtures. This synthesis does not require soluble precursors and the reaction time is significantly reduced as compared to standard solvothermal synthesis methods. In addition to applying the synthesis to previously reported imide COFs, a new perylene‐based COF was also synthesized, which could not be obtained by the classical solvothermal route. In situ high‐temperature XRPD analysis hints to the formation of precursor–salt adducts as crystalline intermediates, which then react with each other to form the COF.

• Dokumententyp: Zeitschriftenartikel
• EU Funded Grant Agreement Number: 639233
• EU-Projekte: Horizon 2020 > ERC Grants > ERC Starting Grant > ERC Grant 639233: Fuel from sunlight: Covalent organic frameworks as integrated platforms for photocatalytic water splitting and CO2 reduction
• Publikationsform: Publisher's Version
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 1521-3757
• Sprache: Englisch