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Nanometer-Sized Molybdenum-Iron Oxide Capsule-Surface Modifications: External and Internal

Müller, Achim ; Bögge, Hartmut ; Sousa, Filipa L. ; Schmidtmann, Marc ; Kurth, Dirk G. ; Volkmer, Dirk ; van Slageren, Joris ; Dressel, Martin ; Kistler, Melissa L. ; Liu, Tianbo

Small (Weinheim an der Bergstrasse, Germany), 2007-06, Vol.3 (6), p.986-992 [Periódico revisado por pares]

Weinheim: WILEY-VCH Verlag

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  • Título:
    Nanometer-Sized Molybdenum-Iron Oxide Capsule-Surface Modifications: External and Internal
  • Autor: Müller, Achim ; Bögge, Hartmut ; Sousa, Filipa L. ; Schmidtmann, Marc ; Kurth, Dirk G. ; Volkmer, Dirk ; van Slageren, Joris ; Dressel, Martin ; Kistler, Melissa L. ; Liu, Tianbo
  • Assuntos: Ferric Compounds - chemistry ; magnetic properties ; Metal Nanoparticles - chemistry ; metal oxides ; Models, Molecular ; molybdenum ; Molybdenum - chemistry ; Nanocapsules - chemistry ; nanomanipulation ; self-assembly ; Surface Properties ; Temperature
  • É parte de: Small (Weinheim an der Bergstrasse, Germany), 2007-06, Vol.3 (6), p.986-992
  • Notas: ark:/67375/WNG-5H8ZC1WX-7
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  • Descrição: 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. Uptake between “open” and “closed”: In hollow, spherical clusters and capsules, built up by linking pentagonal molybdenum–oxide‐based units via metal cations, partial substitution of the former by other kinds of metal cations is possible, which leads to capsule opening. During this process, molybdate ions from the exterior “flow” into the capsule and are subsequently distributed in the cavity in an irregular manner. A new, well‐defined capsule skeleton is formed containing the substituted metal cations.
  • Editor: Weinheim: WILEY-VCH Verlag
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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