Integration of an N‐Heterocyclic Carbene Precursor into a Covalent Triazine Framework for Organocatalysis

Abstract

The successful incorporation of a thermally fragile imidazolium moiety into a covalent triazine framework resulted in a heterogeneous organocatalyst active in carbene‐catalyzed umpolung reaction. The structural integrity of the imidazolium moiety was confirmed by combining solid‐state NMR and XPS experiments.

Finding the Sweet Spot of Photocatalysis─A Case Study Using Bipyridine-Based CTFs

“…400, 370 and 240 m 2 /g, for CTF-02-Bpy 0.33 , CTF-02-Bpy 0.66 and CTF-02-Bpy, respectively (Table 2). A possible explanation for the decrease in apparent surface area might include a non-favorable interaction of N 2 with the more polar surface of the bipyridine containing materials or a denser state of the flexible bipyridinecontaining CTFs after activation and cooling to 77 K. 44 Especially in heterogeneous catalysis, a high specific surface area in an open material is a key feature to assure accessibility of the active sites. As we aim for aqueous liquid phase catalysis, not only the apparent surface area, but also the interaction and porosity towards a given solvent has to be considered.…”

Metalated covalent organic frameworks: from synthetic strategies to diverse applications

“…275 An unavoidable challenge in constructing COFs with NHC or NHC–M monomers is their stability under solvothermal conditions. 276…”

Construction of a Stable Crystalline Polyimide Porous Organic Framework for C2H2/C2H4 and CO2/N2 Separation

“…[1,2,4,[7][8][9][10][11][12][13][14][15][16] Porous organic frameworks (POFs) or covalent organic frameworks (COFs), [17][18][19][20][21][22][23][24] an emerging family of porous materials, have attracted interest from the scientific communityf or their potentiali nm olecular separation, [25,26] catalysis, [27][28][29] drug delivery, [30,31] energy storage, [32][33][34][35] and many other applications. [36][37][38][39][40][41] In 2005, in pioneering work, crystalline COF-1 and COF-5 were fabricated by Yaghi and co-workers. [42] Since then crystalline variants have been obtained out by utilizing limited polymerization methodsa nd varying the building units.…”

“…Porous organic frameworks (POFs) or covalent organic frameworks (COFs), an emerging family of porous materials, have attracted interest from the scientific community for their potential in molecular separation, catalysis, drug delivery, energy storage, and many other applications . In 2005, in pioneering work, crystalline COF‐1 and COF‐5 were fabricated by Yaghi and co‐workers .…”