Abstract
AbstractUsing the mixed‐metal approach, a direct synthesis route at ambient pressure was developed for a new type of bimetallic metal‐organic framework based on the CPO‐27 structure. The structural characterization of CPO‐27(Cu0.6−CS−Co0.4) using X‐ray diffraction, transmission electron microscopy, energy‐dispersive X‐ray mapping and X‐ray absorption spectroscopy revealed that the Cu2+ and Co2+ ions were exclusively incorporated at the metal positions of the CPO‐27 lattice, but with a core‐shell distribution within the crystallites. The parent framework material was then utilized as a precursor for the generation of novel bimetallic carbon‐supported materials using the controlled thermal decomposition in a reducing atmosphere. During this decomposition process, the distribution of the two metals remained the same, which resulted in unique needle‐shaped particles with a high dispersion of cobalt at the periphery of the amorphous carbon and agglomerated copper particles in the inside.
Highlights
Using the mixed-metal approach, a direct synthesis route at ambient pressure was developed for a new type of bimetallic metal-organic framework based on the CPO-27 structure
The concept of isostructural mixed-metal metal-organic framework materials, in which all metals are distributed over crystallographically equivalent framework position, is easy to realize when metals with similar properties are combined.[12]
Depending on the synthesis conditions and the combination of metals, different structural arrangements of the metal ions within the lattice can be obtained.[12a]. In the majority of multimetallic metal-organic framework (MOF) materials, a statistical distribution of all metal ions is targeted, which enables a straightforward tailoring of properties
Summary
Using the mixed-metal approach, a direct synthesis route at ambient pressure was developed for a new type of bimetallic metal-organic framework based on the CPO-27 structure. Even multimetallic[9] CPO-27 materials have been reported, in which the metals were claimed to be statistically distributed within the framework structure.
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