Room Temperature Synthesis of Covalent–Organic Framework Films through Vapor-Assisted Conversion

Abstract

We describe the facile synthesis of several two-dimensional covalent–organic frameworks (2D COFs) as films by vapor-assisted conversion at room temperature. High-quality films of benzodithiophene-containing BDT-COF and COF-5 with tunable thickness were synthesized under different conditions on various substrates. BDT-COF films of several micrometer thickness exhibit mesoporosity as well as textural porosity, whereas thinner BDT-COF films materialize as a cohesive dense layer. In addition, we studied the formation of COF-5 films with different solvent mixture compositions serving as vapor source. Room temperature vapor-assisted conversion is an excellent method to form COF films of fragile precursors and on sensitive substrates.

Selective Molecular Sieving in Self‐Standing Porous Covalent‐Organic‐Framework Membranes

“…[21] These selfstanding COMs are flexible, continuous, devoid of Covalent organic frameworks (COFs) represent a new category of highly porous, crystalline polymers with uniformly arranged ordered pore channels. The other formidable obstacles that prevent utilization of COFs in real life separation applications are: i) chemical instability, [10] ii) difficult synthetic procedures, [11] iii) scalability, [12] and iv) insolubility in solvents. [9] The key issue behind this problem is the difficulty of fabricating COF particles into a selfstanding, stable membrane form.…”

“…[18c] In this context, the use of crystalline porous materials with precise pore channels (1-2 nm) can create a significant advancement in NF membrane, as it can enhance permeability and selectivity. The other formidable obstacles that prevent utilization of COFs in real life separation applications are: i) chemical instability, [10] ii) difficult synthetic procedures, [11] iii) scalability, [12] and iv) insolubility in solvents. However, almost all zeo lites or MOFbased membranes are fabricated either by incor porating these fillers within a polymer matrix or by growing them on a support.…”

“…The resultant COMs display higher porosity and crystallinity over their reported powder form. The other formidable obstacles that prevent utilization of COFs in real life separation applications are: i) chemical instability, [10] ii) difficult synthetic procedures, [11] iii) scalability, [12] and iv) insolubility in solvents. [1][2][3][4] Even though COFs have been dem onstrated for storage applications of a wide variety of molecular species like gasses, [5] nanoparticles, [6] enzymes [7] and drugs; [8] benefits of their ordered pore channels for molecular separation is hardly extracted.…”

One Step Facile Synthesis of Amine-Functionalized COF-1 with Enhanced Hydrostability

“…To probe the interactions between APTES and COF-1, 11 B multiple quantum magic angle spinning (MQMAS) 9,14, was employed. As shown in Figure 2, multiple tri-coordinate boron (B [3] ) and tetrahedral-coordinated boron (B [4] ) species are observed. The dominant B [3] peak at 34 ppm isotropic shift is assigned to the backbone structure of COF-1.…”

Covalent Organic Frameworks Baseados Em Carbazóis: Concepção, Síntese E Caracterização

“…Para isso, a obtenção de filmes finos desses materiais é imprescindível. Alguns trabalhos já obtiveram filmes finos a partir de COFs (Colson et al, 2011;Colson et al, 2015;Deblase et al, 2015;Medina et al, 2015). : 162, 160, 156, 146, 139, 129, 126, 123, 118. 6.2.6.…”