Isolated Heterometallic Cr7Ni Rings Grafted on Au(111) Surface

详细信息    查看全文

• 作者：Valdis Corradini ; Roberto Biagi ; Umberto del Pennino ; Valentina De Renzi ; Alessandro Gambardella ; Marco Affronte ; Christopher A. Muryn ; Grigore A. Timco ; Richard E. P. Winpenny
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：June 11, 2007
• 年：2007
• 卷：46
• 期：12
• 页码：4937 - 4943
• 全文大小：665K
• 年卷期：v.46,no.12(June 11, 2007)
• ISSN：1520-510X

文摘

A study of the deposition of heterometallic antiferromagnetically coupled rings onto gold surfaces is reported. Twonew {Cr₇Ni} rings, [NH₂ⁿPr₂][Cr₇NiF₈(3-tpc)₁₆] (1) (where 3-tpc = 3-thiophenecarboxylate) and [ⁿBuNH₂CH₂CH₂SH][Cr₇NiF₈(O₂C^tBu)₁₆] (2) have been made and structurally characterized. They have been deposited from the liquidphase on Au(111) and the adsorbed molecules compared by means of scanning tunneling microscopy (STM) andX-ray photoemission spectroscopy (XPS). In both cases a two-dimensional distribution of individually accessible{Cr₇Ni} heterometallic rings on the gold surface has been obtained, exploiting the direct grafting of sulfur-functionalizedclusters. There is a competition between the chemisorption of the {Cr₇Ni} clusters and a thiolic self-assembledmonolayer (SAM) formed by free ligands. In 2, the presence of a single sulfur ligand should force the molecule tograft with the ring axis normal to the surface. The cluster stability in the STM images and the S-2p energy positionsdemonstrate, for both functionalizations, the strength of the grafting with the gold surface.