Self-Assembled Monolayer of Cr7Ni Molecular Nanomagnets by Sublimation

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• 作者：Alberto Ghirri ; Valdis Corradini ; Valerio Bellini ; Roberto Biagi ; Umberto del Pennino ; Valentina De Renzi ; Julio C. Cezar ; Christopher A. Muryn ; Grigore A. Timco ; Richard E. P. Winpenny ; Marco Affronte
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：September 27, 2011
• 年：2011
• 卷：5
• 期：9
• 页码：7090-7099
• 全文大小：1147K
• 年卷期：0
• ISSN：1936-086X

文摘

We show, by complementary spectroscopic and STM analysis, that Cr₇Ni derivatives are suitable to be sublimed in UHV conditions. Cr₇Ni-bu weakly bonds to gold surface and can diffuse relatively freely on it, forming monolayers with hexagonal 2D packing. Conversely, by adding a functional thiol group to the central dibutylamine, a covalent bond between the molecule and surface gold adatoms is promoted, leading to a strong molecular grafting and the formation of a disordered monolayer. These two examples demonstrate the possibility to control the assembly of a large molecular complex, as rationalized by DFT calculations that establish different energy scales in the deposition processes. Moreover, low-temperature XMCD sprectra show that the magnetic features of Cr₇Ni rings deposited in UHV on gold remain unchanged with respect to those of the corresponding bulk sample.