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. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Grafting single molecule magnets on gold nanoparticles
PINEIDER, FRANCESCO;
2014-01-01
Abstract
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. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
