Nanometer-sized molybdenum-iron oxide capsule-surface modifications: External and internal
authors Muller, A; Bogge, H; Sousa, FL; Schmidtmann, M; Kurth, DG; Volkmer, D; van Slageren, J; Dressel, M; Kistler, ML; Liu, TB
journal SMALL
author keywords magnetic properties; metal oxides; molydenum; nanomanipulation; self-assembly
keywords AQUEOUS-SOLUTION; BUILDING-BLOCKS; GIANT; CHEMISTRY; IONS; MACROANIONS; MOLECULES; MAGNETISM; SPHERES
abstract The cluster {(Mo)Mo-5}(12)Fe-30(III) 1 a present in compound 1 (cluster diameter 2.3 nm), which belongs to the family of nanoscale spherical porous {(Mo)Mo-5}(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 LnCl(3)center dot-nH(2)O (Ln=Ce, Pr) thereby replacing six Fe-III ions with Ln(III) 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 Fe-III, 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 Fe-III and six Ln(III)-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.
publisher WILEY-V C H VERLAG GMBH
issn 1613-6810
year published 2007
volume 3
issue 6
beginning page 986
ending page 992
digital object identifier (doi) 10.1002/smll.200600567
web of science category Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
subject category Chemistry; Science & Technology - Other Topics; Materials Science; Physics
unique article identifier WOS:000247148200007
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journal impact factor 9.598
5 year journal impact factor 9.061
category normalized journal impact factor percentile 90.276
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