Sln-Topological Covalent Organic Frameworks with Shape Dimorphism and Dipolar Rotors.

ABSTRACT: We report herein the first (i) covalent organic frameworks (COFs) with sln topology, (ii) drastic control of the shape of COF crystals with the same topology and chemical composition, (iii) insight that these different shapes are accompanied by conformational isomerism, and (iv) installation of dipolar rotors into three-dimensional (3D) COFs. We used a new building block, hexaarylbenzene with three dipolar 1,2-difluorophenyls. Depending on the solution composition, we generated two types of COF crystals with different shapes: hexagonal prism (TK-COF-P) and membrane (TK-COF-M). Although they exhibit distinctly different powder X-ray diffraction patterns, they are chemically identical. The structural determinations revealed that they have a low-symmetric, low-density

SUBMITTER: Wang X 

PROVIDER: S-EPMC12395412 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature