No abstract

A fully π-conjugated nitrogen-rich three-dimensional covalent organic framework (PYTRI-COF-2) containing both pyrazine and triazine units was prepared through a post-synthetic strategy. The imine linkages in the pre-prepared PYTRI-COF-1 were converted into heterocyclic quinoline by the Povarov reaction. The obtained PYTRI-COF-2 displayed high Li-ion storage capacity and excellent cycling stability when it was used as the lithium (Li)-ion battery electrode.

We report a facile strategy to prepare a large amount of ultrathin graphdiyne (GDY) with good crystallinity in the mixture of oil–water systems. By simply mixing the solution of GDY monomer in CHCl3 and the copper acetate solution as a catalyst in water and stirring at room temperature, ultrathin GDY films with a thickness of ∼4 nm were obtained in a yield of 95 %. This work provides a feasible path for the substantial preparation of GDY films and may pave the way to the development of substantial preparation of the GDY materials.

The aggregation-induced emission fluorescent structures based on the imine bonds usually suffer fluorescence quenching owing to the possible charge transfer process between the lone pair electrons from the imine to the fluorescent luminogens. In this work, it was found that the extended molecular linker between the imine units and the TPE core can inhibit the charge transfer process and result in high AIE fluorescent property. A good regularity was found and summarized with a mechanism study. This work may help to solve the problem of the construction of AIE fluorescent structures based on the imine bond.