Spin Structure of Surface-Supported Single-Molecule Magnets from Isomorphous Replacement and X-ray Magnetic Circular Dichroism

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• 作者：Matteo Mannini ; Erik Tancini ; Lorenzo Sorace ; Philippe Sainctavit ; Marie-Anne Arrio ; Yu Qian ; Edwige Otero ; Daniele Chiappe ; Ludovica Margheriti ; Julio C. Cezar ; Roberta Sessoli ; Andrea Cornia
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：April 4, 2011
• 年：2011
• 卷：50
• 期：7
• 页码：2911-2917
• 全文大小：870K
• 年卷期：v.50,no.7(April 4, 2011)
• ISSN：1520-510X

文摘

Surface-supported arrays of Fe₄-type Single-Molecule Magnets retain a memory effect and are of current interest in the frame of molecule-based information storage and spintronics. To reveal the spin structure of [Fe₄(L)₂(dpm)₆] (1) on Au, an isomorphous compound [Fe₃Cr(L)₂(dpm)₆] was synthesized and structurally and magnetically characterized (H₃L is tripodal ligand 11-(acetylthio)-2,2-bis(hydroxymethyl)undecan-1-ol and Hdpm is dipivaloylmethane). The new complex contains a central Cr³⁺ ion and has a S = 6 ground state as opposed to S = 5 in 1. Low-temperature X-ray Magnetic Circular Dichroism studies at Fe- and Cr-L_2,3 edges revealed that the antiparallel alignment between Fe and Cr spins is preserved on surfaces. Moreover, the different Fe-L_2,3 spectral features found in the homo- and heterometallic species disclose the opposing contribution of the central Fe³⁺ ion in the former compound, proving that its ferrimagnetic spin structure is retained on surfaces.