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44037-AC3
Self-Assembly of Metallic Nanoparticles Mediated by Metal-Organic and Metal-Organometallic Coordination Networks
Dwight A. Sweigart, Brown University
Nanoparticles, particularly magnetic NPs, have received much attention. We have attempted to arrange and modify Fe3O4 and FePt NPs with Organometallics that may function as catalytic sites. As a prelude to this, we demonstrated that (semiquinone)Mn(CO)3 (SQMTC)can form a monolayer on HOPG. Treatment of Fe3O4 NPs with (hydroquinone)Mn(CO)3 (HQMTC) results in the coordination of SQMTC to the iron centers on the NP surface. These centers function as templates for the formation of coordination polymers. The resulting hybrid materials have been characterized by magnetization, X-ray diffraction, TEM, and EDS studies. The NPs in these materials are randomly distributed and their presence is proven by ICP and TEM analysis. The metal notes that exist in the polymer include Mn(II) and Cd(II). The hybrid materials thus obtained can be easily separated by magnetic decantation. This represents the first time that coordination polymers have been synthesized that include magnetic nanoparticles. The manganese work is being expanded to rhodium and ruthenium, and the results so far are very encouraging for the synthesis of novel catalytic materials that can be separated by magnetic decantation.
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