Nanometer‐Sized Molybdenum–Iron Oxide Capsule‐Surface Modifications: External and Internal
Source abstract
Abstract
Abstract The cluster {(Mo)Mo5}12FeIII30 1 a present in compound 1 (cluster diameter ≈2.3 nm), which belongs to the family of nanoscale spherical porous {(Mo)Mo5}12{Linker}30 capsules that allow a new type of nanochemistry inside their cavities as well as unprecedented aggregation processes under gaseous, solution, and solid‐state conditions, is the starting material for the present investigation. In solution it reacts with LnCl3⋅nH2O (Ln=Ce, Pr) thereby replacing six FeIII ions with LnIII ions to form compounds 2 (Ce) and 3 (Pr). During metal‐cation exchange, some of the pentagonal {(Mo)Mo5O21(H2O)6}6− units, which are connected to the FeIII centers in 1 a, decompose, thus leading to a temporary capsule opening and uptake of the formed smaller molybdate units into the capsule cavities. In 2 and 3, the pentagonal units are connected via 24 FeIII and six LnIII‐type linkers/spacers representing together the capsule skeletons, which are structurally well‐defined in contrast to the capsule contents. The new capsules self‐associate into single‐layer blackberry‐type structures, thus extending the variety of these types of assemblies; the assembly process, that is, the size of the final species, can be controlled by the pH, which allows the generation of differently sized nanoparticles. Magnetic properties of the two new nanomaterials 2 and 3 are also determined.
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Research context
OpenAlex topics: Polyoxometalates: Synthesis and Applications · Nanocluster Synthesis and Applications · Metalloenzymes and iron-sulfur proteins
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (66)
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