铁基三核金属有机纳米结构在局部电荷积累表面的研究
Iron-based trinuclear metal-organic nanostructures on a surface with local charge accumulation
摘要：
配位化学依赖于利用有机基质中的活性金属位点。多核配合物-由有机配体结合到几个金属原子的簇组成，由于其电子/磁性和功能反应途径的潜力而特别令人感兴趣。然而，它们的合成仍然具有挑战性;仅实现了有限数量的几何形状和配置。在这里，我们合成-通过超分子化学在贵金属表面-一维金属有机纳米结构组成的三联吡啶（tpy）为基础的分子与明确定义的多核铁簇。通过低温扫描探针显微镜技术和密度泛函理论相结合，我们证明了该配位基序由共面的tpy通过线性三铁节点连接在一个混合（正）价，金属-金属键配置。这种不寻常的连接是稳定的阳离子，配体和表面之间的界面上的电子的局部积累。后者通过自下而上的表面合成实现，暗示了化学活性金属中心，并为具有新型催化和磁性功能的纳米材料工程打开了大门。
英文摘要：
Coordination chemistry relies on harnessing active metal sites within organic matrices. Polynuclear complexes - consisting of organic ligands binding to clusters of several metal atoms are of particular interest, owing to their electronic/magnetic properties and potential for functional reactivity pathways. However, their synthesis remains challenging; only a limited number of geometries and configurations have been achieved. Here, we synthesise - via supramolecular chemistry on a noble metal surface - one-dimensional metal-organic nanostructures composed of terpyridine (tpy)-based molecules coordinated with well-defined polynuclear iron clusters. By a combination of low-temperature scanning probe microscopy techniques and density functional theory, we demonstrate that the coordination motif consists of coplanar tpy's linked via a linear tri-iron node in a mixed (positive) valence, metal-metal bond configuration. This unusual linkage is stabilized by a local accumulation of electrons at the interface between cations, ligand and surface. The latter, enabled by the bottom-up on-surface synthesis, hints at a chemically active metal centre, and opens the door to the engineering of nanomaterials with novel catalytic and magnetic functionalities.
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