Structural design and determination of 3D covalent organic frameworks

Conjugated Three-Dimensional High-Connected Covalent Organic Frameworks for Lithium–Sulfur Batteries

“…3D COFs still remain relatively less explored in comparison with their 2D analogues due to the still limited building blocks and difficulty in solving their more complicated structure . Thus far, only building blocks with 3D tetrahedral ( T d ), − triangular prismatic ( D 3h ), − and cubic ( O h ) , symmetry have been used to fabricate 3D COFs, leading to corresponding materials with extended topologies of ctn , bor , dia , ion , pts , ljh , rra , nbo , tbo , fjh , ffc , acs , ceq , hea , stp , srs , pcb , and bcu , far from their analogous metal-organic frameworks (MOFs) .…”

Rationally Fabricating Three-Dimensional Covalent Organic Frameworks for Propyne/Propylene Separation

“…27−30,40,52−54 However, hindered by the limited building blocks and difficulty in structure determination, using 3D COFs for efficient gas separation is still in its infancy. 31,35,36 Thus, developing 3D COFs with tailored microporous structures and accessible active sites for gas separation, especially C 3 H 4 /C 3 H 6 separation, is of great significance. To achieve such a goal, there are two feasible design approaches: (1) introducing the specific adsorption sites 22,32,33 and (2) forming appropriate pore apertures to enhance the interaction of gas molecules and frameworks.…”

Multi-sulfonated functionalized hydrophilic covalent organic framework for highly efficient dye removal from real samples

“…Since covalent organic frameworks (COFs) were initially reported in 2005 by Yaghi, 1 COFs as a burgeoning class of nanoporous and crystalline materials were customarily constructed by linking building blocks through stable covalent bonds. [2][3][4][5] Their intriguing structural nature, such as the designability of the unit structure, highly ordered channels, tunable porous sizes, as well as excellent thermal and chemical stability, endows them with tremendous interest in gas sorption, 6 separation, 7,8 catalysis, 9,10 electronics, 11,12 sensors, 13,14 batteries, 15 photocatalytics 16,17 and so forth. Specifically, COFs as adsorbing materials have been extensively exploited for the selective removal of organic dyes from polluted water in view of their large surface areas and superb visible light absorbance based on the different interactions between dye molecules and COF surfaces: for example, electrostatic interaction, p-p stacking interaction and hydrogen bonding.…”