Spectroscopic scanning tunneling microscopy studies of single surface-supported free-base corroles.

Spectroscopic scanning tunneling microscopy studies of single surface-supported free-base corroles.
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DOI:
10.1021/ja209225f
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发表时间:
2012-01-11
影响因子:
15
通讯作者:
Koch, Reinhold
Koch, Reinhold
中科院分区:
化学1区
文献类型:
--
作者:
Rashidi, Mohammad;Muellegger, Stefan;Roithner, Manuel;Schoefberger, Wolfgang;Koch, Reinhold

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科罗尔是一种在溶液中具有多种化学活性的试剂。将它们的应用扩展到表面支持的系统需要了解Corole-表面相互作用的基本知识。我们利用低温扫描隧道显微镜的尖端作为局域探针,在单分子水平上研究了表面负载的自由碱相关分子的电子性质和几何性质。为了给其他基于Corole的表面体系提供参考,我们选择原型的5,10,15-三(五氟苯基)Corole[H3(TpFPC)]作为模型体系,弱吸附在相互作用强度不同的两个表面上。我们证明了H3(TpFPC)在原始的Au(111)表面和中间有机层上的非解离吸附,这为在亚分子水平上研究几乎未受干扰的H3(TpFPC)分子的几何和前线轨道电子性质提供了足够的电子去耦合。与结构相似的卟啉相比,我们发现H3(TpFPC)的吸附行为有所偏离,其特征是一对手性分子-底物构型。
Corroles are versatile chemically active agents in solution. Expanding their applications toward surface-supported systems requires a fundamental knowledge of corrole–surface interactions. We employed the tip of a low-temperature scanning tunneling microscope as local probe to investigate at the single-molecule level the electronic and geometric properties of surface-supported free-base corrole molecules. To provide a suitable reference for other corrole-based systems on surfaces, we chose the archetypal 5,10,15-tris(pentafluorophenyl)corrole [H3(TpFPC)] as model system, weakly adsorbed on two surfaces with different interaction strengths. We demonstrate the nondissociative adsorption of H3(TpFPC) on pristine Au(111) and on an intermediate organic layer that provides sufficient electronic decoupling to investigate geometric and frontier orbital electronic properties of almost undisturbed H3(TpFPC) molecules at the submolecular level. We identify a deviating adsorption behavior of H3(TpFPC) compared to structurally similar porphyrins, characterized by a chiral pair of molecule–substrate configurations.
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