Imaging Aspect Ratio-Dependent Anisotropic Conversion of Bismuth-Based Metal-Organic Frameworks into Bismuth Oxides.

Metal-organic frameworks (MOFs) have emerged as promising templates and precursors that can be converted to a series of functional materials. Probing the dynamic conversion processes within individual MOF crystal particles in real-time is key to understanding the structure-activity relationship, but this remains challenging, particularly for anisotropic MOF crystals. Here, using dark-field optical microscopy, we visually image and quantify the dynamic oxidation conversion of a single bismuth-based metal-organic framework (Bi-MOF) into bismuth oxides by NaClO.

Imaging the Iodine Sorption-Induced Synchronous Skeleton-Pore Interactions of Single Covalent Organic Framework Particles.

Covalent organic frameworks (COFs) are promising iodine adsorbents. For improved performances, it is critical and essential to fundamentally understand the underlying mechanism. Here, using the operando dark-field optical microscopy (DFM) imaging technique, the observation of an extraordinary structure shrinkage of 2D triphenylbenzene (TPB)-dimethoxyterephthaldehyde (DMTP)-COF upon the adsorption of I vapor at the single-particle resolution is reported.