Total scattering reveals the hidden stacking disorder in a 2D covalent organic framework

Abstract

<p>Interactions between extended π-systems are often invoked as the main driving force for stacking and crystallization of 2D organic polymers. In covalent organic frameworks (COFs), the stacking strongly influences properties...</p>

Solving the COF trilemma: towards crystalline, stable and functional covalent organic frameworks

“…Investigation of the stacking in COFs is often limited by the information that can be extracted from the available powder X-ray diffraction data. As such, the most prominent stacking types that are identified from PXRD are the so-called eclipsed stacking, which is likely to be an approximate to the real stacking type only, 182 and the completely offset, staggered stacking, all others being rarely discerned. 3,128,[183][184][185] In addition to these simple descriptions of stacking, works on varied forms of stacking and their influence on structure and properties of COFs exist, 186 but here we will focus on the challenges of stacking for crystallinity in COFs.…”

Nanoscale covalent organic frameworks as theranostic platforms for oncotherapy: synthesis, functionalization, and applications

“…In addition, the stacking of COF layers may not be simple overlapping or staggered stacking. Some COFs with interlayer slips have been reported, [500][501][502][503][504][505][506][507] which further increases the difficulty of structural analysis.…”

Festkörperchemie

“…33) Lotsch und Dinnebier erforschten die 2-D-Struktur kovalenter organischer Gerüstverbindungen (covalent organic frameworks, COFs) anhand von Totalstreuung mit PDF-Analyse von Synchrotrondaten unterstützt durch Elektronenmikroskopie (Abbildung 8). 34) Stapelfehler in iminverknüpften TTI-COFs simulierten sie und klärten den zufälligen lokalen Versatz der Lagen (TTI = Triazin-triazin-triphenylimin).…”

“…Paarverteilungsfunktionen des MOFs Ni(BDC)(PNO) und dessen Zersetzungsprodukte bei verschiedenen Temperaturen im Vergleich mit einer Ni fcc PDF. Interatomare C-C-(Dreiecke), Ni-O-(Quadrate) und N-N-Abstände (offene Symbole) sind zugewiesen 34).…”