Thanks to the recent advancement in characterisation techniques, the preparation methodologies of single-atom catalysts (SACs) are increasingly unravelled and optimised. This mini-review highlights some key recent progress in the engineering of SACs within metal-organic frameworks (MOFs) and their catalytic applications. Briefly, the preparation methods can be categorised into (1) anchoring onto the functional ligand sites, (2) anchoring onto the nodal centres, and (3) by pyrolysis. The development of comprehensive characterisation techniques enables scientists to elucidate the structure-activity relationship of these catalysts, which aids the subsequent engineering of more superior catalytic systems at an atomistic perspective.
We
report the guest-anion-induced photoluminescence enhancement
of metal–organic frameworks (UiO-66-NH2), first
based upon diffraction and computational evidence. We found that only
limited anions, namely, carbonate and fluoride, can lead to a significant
enhancement in photoluminescence, whereas their related anions, such
as acetate and chloride, cannot. The optimized crystal structures
reveal that the guest carbonate and fluoride ions interact with four
framework amino functional groups through hydrogen bonding (ca. 1.6–1.7
Å) that ultimately forms a quaternary (−N(H))4···X– molecular bridge around the
nodal center. Hence, the hydrogen-bonded molecular bridge not only
restricts the intermolecular C–C rotation of the linker molecules
but also greatly perturbs the electronic densities between the guest
anions and the framework amino groups.
Precisely tuning the nuclearity of supported metal nanoclusters is pivotal for designing more superior catalytic systems, but it remains practically challenging. By utilising the chemical and molecular specificity of UiO-66-NH2...
The viability of using ammonia as a hydrogen storage vector is contingent on the development of catalytic systems active for ammonia decomposition at low temperatures. Zeolite-supported metal catalysts, unlike systems...
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