Rich nitrogen atoms in an azine covalent organic framework for gas uptake

Abstract

Covalent organic frameworks (COFs) are a new type of porous organic material with crystalline and nanoporous structures. Here, an azine-linked COF (Ns-COF) that can accommodate rich nitrogen atoms on the...

Porphyrin–anthracene covalent organic frameworks for sustainable photosterilization

“…To endow the material with good photothermal and sustained photodynamic properties, the photosensitive unit TAPP and the chemical source of 1 O 2 DPA were selected as monomers, and the required Por-DPA was constructed by the Schiff base reaction. The highly ordered crystal structure is beneficial to the transport of oxygen and the resulting 1 O 2 , 37–39 so the key factors affecting the formation of the COF, such as the reaction solvent, reaction time and reaction temperature, were optimized in detail (Fig. S1, ESI†).…”

“…To endow the material with good photothermal and sustained photodynamic properties, the photosensitive unit TAPP and the chemical source of 1 O 2 DPA were selected as monomers, and the required Por-DPA was constructed by the Schiff base reaction. The highly ordered crystal structure is beneficial to the transport of oxygen and the resulting 1 O 2 ,[37][38][39] so the key factors affecting the formation of the COF, such as the reaction solvent, reaction time and reaction temperature, were optimized in detail (Fig.S1, ESI †). As a result, the Por-DPA COF was obtained from TAPP and DPA in a mixture solution of mesitylene/n-butanol (9/1, v/v, 2.0 mL) with 6 mol L À1 aqueous acetic acid (0.2 mL) as the catalyst at 120 1C for 3 d. The as-prepared Por-DPA exhibits good photothermal and photodynamic activities under irradiation due to the existence of the TAPP unit and high crystal structure.…”

Fluorescent covalent organic frameworks for environmental pollutant detection sensors and enrichment sorbents: a mini-review

“…The CuCOF was applied to the detection of H 2 S in actual samples such as domestic water and Yellow River water, and the recoveries were in the range of 101.07–107%, proving its ability to detect H 2 S with high sensitivity and selectivity, which can achieve the detection of H 2 S in environmental samples and provide a new strategy for H 2 S detection based on fluorescence. Xing et al 78 have synthesized a nitrogen-rich COF (Ns-COF) using 2,4,6-tris(4-formylphenyl)-1,3,5-triazine (TFPT) with hydrazine hydrate. The iodine vapor uptake of the Ns-COF was examined at 350 K atmospheric pressure, and the absorption equilibrium was reached at 36 h with a maximum uptake of 4.21 g g −1 (Fig.…”