Self-Assembled Monolayer of Cr7Ni Molecular Nanomagnets by Sublimation

被引：38

作者：

Ghirri, Alberto ^{[1
]}

Corradini, Valdis ^{[1
]}

Bellini, Valerio ^{[1
]}

Biagi, Roberto ^{[1
,2
]}

del Pennino, Umberto ^{[1
,2
]}

De Renzi, Valentina ^{[1
,2
]}

Cezar, Julio C. ^{[3
]}

Muryn, Christopher A. ^{[4
,5
]}

Timco, Grigore A. ^{[4
,5
]}

Winpenny, Richard E. P. ^{[4
,5
]}

Affronte, Marco ^{[1
,2
]}

机构：

[1] CNR, Inst Nanosci, Ctr S3, I-41125 Modena I, Italy

[2] Univ Modena & Reggio Emilia, Dipartimento Fis, I-41125 Modena I, Italy

[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[4] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England

[5] Univ Manchester, Photon Sci Inst, Manchester M13 9PL, Lancs, England

来源：

ACS NANO | 2011年 / 5卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

molecular magnets; self-assembly; thermal deposition; thiol; STM; XMCD; density functional theory; SCANNING-TUNNELING-MICROSCOPY; GOLD SURFACES; MAGNETIC MOLECULES; AU(111); DEPOSITION; COMPLEXES; RINGS; SPIN;

D O I：

10.1021/nn201800e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：7090 / 7099

页数：10

共 47 条

[1] Will spin-relaxation times in molecular magnets permit quantum information processing? [J].