Single-Molecule Magnets: A New Approach To Investigate the Electronic Structure of Mn12 Molecules by Scanning Tunneling Spectroscopy

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• 作者：Michael Burgert ; Sö ; nke Voss ; Simon Herr ; Mikhail Fonin ; Ulrich Groth ; Ulrich Rü ; diger
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：November 21, 2007
• 年：2007
• 卷：129
• 期：46
• 页码：14362 - 14366
• 全文大小：314K
• 年卷期：v.129,no.46(November 21, 2007)
• ISSN：1520-5126

文摘

A new approach to the deposition of Mn₁₂ single-molecule magnet monolayers on thefunctionalized Au(111) surface optimized for the investigation by means of scanning tunneling spectroscopywas developed. To demonstrate this method, the new Mn₁₂ complex [Mn₁₂O₁₂(O₂CC₆H₄F)₁₆(EtOH)₄]·4.4CHCl₃ was synthesized and characterized. In MALDI-TOF mass spectra the isotopic distribution of themolecular ion peak of the latter complex was revealed. The complex was grafted to Au(111) surfaces viatwo different short conducting linker molecules. The Mn₁₂ molecules deposited on the functionalized surfacewere characterized by means of scanning tunneling microscopy showing homogeneous monolayers ofhighest quality. Scanning tunneling spectroscopy measurements over a wider energy range comparedwith previous results could be performed because of the optimized Au(111) surface functionalization.Furthermore, the results substantiate the general suitability of short acidic linker molecules for the preparationof Mn₁₂ monolayers via ligand exchange and represent a crucial step toward addressing the magneticproperties of individual Mn₁₂ single-molecule magnets.