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Grafting Single Molecule Magnets on Gold Nanoparticles

The chemical synthesis and characterization of the first hybrid material composed by gold nanoparticles and single molecule magnets (SMMs) are described. Gold nanoparticles are functionalized via ligand exchange using a tetrairon(III) SMM containing two 1,2‐dithiolane end groups. The grafting is evidenced by the shift of the plasmon resonance peak recorded with a UV–vis spectrometer, by the suppression of nuclear magnetic resonance signals, by X‐ray photoemission spectroscopy peaks, and by transmission electron microscopy images. The latter evidence the formation of aggregates of nanoparticles as a consequence of the cross‐linking ability of Fe4 through the two 1,2‐dithiolane rings located on opposite sides of the metal core. The presence of intact Fe4 molecules is directly proven by synchrotron‐based X‐ray absorption spectroscopy and X‐ray magnetic circular dichroism spectroscopy, while a detailed magnetic characterization, obtained using electron paramagnetic resonance and alternating‐current susceptibility, confirms the persistence of SMM behavior in this new hybrid nanostructure.

A novel hybrid nanomaterial is obtained by functionalizing gold nanoparticles with a tetrairon(III) single‐molecule magnet containing two 1,2‐dithiolane end groups, which promote aggregation of the Au nanoparticles. The presence of intact Fe4 molecules is proven by synchrotron‐based Xray Absorption Spectroscopy and Xray Magnetic Circular Dichroism Spectroscopy, while a detailed magnetic characterization confirms the persistence of SMM behavior, thus opening interesting perspectives in the field of molecular spintronics.

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Authors:   Mauro Perfetti, Francesco Pineider, Lorenzo Poggini, Edwige Otero, Matteo Mannini, Lorenzo Sorace, Claudio Sangregorio, Andrea Cornia, Roberta Sessoli
Journal:   Small
Year:   2013
Pages:   n/a
DOI:   10.1002/smll.201301617
Publication date:   29-Aug-2013
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