1 research outputs found
Ionothermal Synthesis of Imide-Linked Covalent Organic Frameworks
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 timeāconsuming process and restricted to wellāsoluble precursor molecules. Synthesis of polyimideālinked COFs (PIāCOFs) is further complicated by the poor reversibility of the ringāclosing reaction under solvothermal conditions. Herein, we report the ionothermal synthesis of crystalline and porous PIāCOFs 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 peryleneābased COF was also synthesized, which could not be obtained by the classical solvothermal route. In situ highātemperature XRPD analysis hints to the formation of precursorāsalt adducts as crystalline intermediates, which then react with each other to form the COF