Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), 08193 Bellaterra, Spain.
J Am Chem Soc. 2011 May 4;133(17):6603-12. doi: 10.1021/ja109296c. Epub 2011 Apr 12.
The two-dimensional self-assembly of a terbium(III) double-decker phthalocyanine on highly oriented pyrolitic graphite (HOPG) was studied by atomic force microscopy (AFM), and it was shown that it forms highly regular rectangular two-dimensional nanocrystals on the surface, that are aligned with the graphite symmetry axes, in which the molecules are organized in a rectangular lattice as shown by scanning tunneling microscopy. Molecular dynamics simulations were run in order to model the behavior of a collection of the double-decker complexes on HOPG. The results were in excellent agreement with the experiment, showing that-after diffusion on the graphite surface-the molecules self-assemble into nanoscopic islands which align preferentially along the three main graphite axes. These low dimension assemblies of independent magnetic centers are only one molecule thick (as shown by AFM) and are therefore very interesting nanoscopic magnetic objects, in which all of the molecules are in interaction with the graphite substrate and might therefore be affected by it. The magnetic properties of these self-assembled bar-shaped islands on HOPG were studied by X-ray magnetic circular dichroism, confirming that the compounds maintain their properties as single-molecule magnets when they are in close interaction with the graphite surface.
通过原子力显微镜（AFM）研究了在高度取向的热解石墨（HOPG）上的铽（III）双酞菁的二维自组装，结果表明它在表面上形成了高度规则的矩形二维纳米晶体，这些晶体与石墨对称轴对齐，通过扫描隧道显微镜可以看出分子在矩形晶格中排列。为了模拟双酞菁配合物在 HOPG 上的行为，进行了分子动力学模拟。结果与实验非常吻合，表明分子在石墨表面扩散后，自组装成纳米级小岛，这些小岛优先沿着三个主要的石墨轴排列。这些由独立磁中心组成的低维组装体只有一个分子厚（如 AFM 所示），因此是非常有趣的纳米级磁体，其中所有的分子都与石墨基底相互作用，因此可能会受到它的影响。通过 X 射线磁圆二色性研究了这些在 HOPG 上自组装的条形岛上的磁性，证实了当化合物与石墨表面紧密相互作用时，它们保持作为单分子磁体的特性。
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