Abstract
A new multifunctional FePt nanoparticle (NP) exhibiting catalytic activity, magnetic properties, and water-compatibility, has been developed. The initial thermal decomposition of iron carbonyl (Fe(CO)5), followed by reduction of platinum acetylacetonate (Pt(acac)2) in the presence of oleic acid and oleylamine produced FePt NPs with Fe-rich core and Pt-rich shell. The hydrophobic NPs were subsequently treated with γ-cyclodextrin (γ-CD), which renders them water-dispersible rather than in organic solvents. Characterization by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), superconducting quantum interface device (SQUID), and X-ray absorption fine structure (XAFS) measurements were performed. The FePt NPs capped with γ-CD (FePt-γ-CD) had a mean diameter of ca. 2.5 nm, which exhibited superparamagnetic behavior at 300 K with zero remanence and coercivity. The FePt-γ-CD was successfully employed as an efficient nanocatalyst for the aqueous hydrogenation reactions with the easy recovering from the reaction mixture by applying an external magnet. Moreover, the FePt-γ-CD prefers the hydrogenation of allyl alcohol over sterically hindered 3-cyclohexene-1-methanol in the competitive reaction due to the molecular recognition property imposed by the surface attached γ-CD.
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