A new nano-structured catalyst with phosphorus acid moieties, synthesized by the reaction of carbon quantum dots (CQDs) and phosphorus acid under refluxing EtOH.
Combining more than two metal−organic frameworks (MOFs) with different structures is an intelligent strategy for the architecture of hybrid MOFs. Herein, well-organized UiO-66(Zr)-on-MIL-125(Ti)-NH 2 growth with g-C 3 N 4 nanosheets was developed for the Gomberg−Buchmann−Hey reaction under visible light irradiation (λ > 420 nm). First, UiO-66(Zr) micropores as host MOFs were fabricated by a solvothermal method. Subsequently, MIL-125(Ti)-NH 2 crystals and g-C 3 N 4 nanosheets were grown inside UiO-66(Zr) to obtain a new type of the dual Zscheme Zr-MOF/Ti-MOF/g-C 3 N 4 heterojunction photocatalyst. Under visible light irradiation, this dual Z-scheme heterojunction acts as a highly efficient photocatalyst for forming C−C bonds via diazonium salts, which can compete with the best photocatalyst systems. The findings indicated that the presence of Zr and Ti metals in MOF-on-MOF and g-C 3 N 4 nanosheets could significantly increase the separation of photogenerated electron−hole pairs and then enhance the photocatalytic performance. The present study not only provides new insights into the architecture of MOFs on other MOFs but also develops Z-scheme heterojunction materials for coupling reactions and other organic reactions under visible light irradiation.
Herein, we report the design and
synthesis of Co-MOF-71/imidazole/SO3H as a novel porous
catalyst with sulfonic acid tags. The
structure and morphology of the catalyst were investigated using various
techniques such as Fourier transform-infrared spectroscopy (FT-IR),
X-ray diffraction, scanning electron microscopy (SEM), SEM elemental
mapping, energy-dispersive X-ray spectroscopy, Barret–Joyner–Halenda,
and N2 adsorption–desorption isotherms. Co-MOF-71/imidazole/SO3H was studied in the preparation of novel pyrazolo[3,4-b]pyridines under mild and green conditions via a cooperative
vinylogous anomeric-based oxidation. A wide range of mono and bis
pyrazolo[3,4-b]pyridines were synthesized with good
to excellent yields (65–82%). A hot filtration test for the
heterogeneous nature of the catalyst indicated the high stability
of the prepared catalyst. The recyclability of Co-MOF-71/imidazole/SO3H is another advantage of the present methodology. The structures
of the final products were confirmed using FT-IR, 1H-NMR,
and 13C-NMR spectroscopic techniques.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.