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Issue 33, 2019
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Controlling the stereospecific bonding motif of Au–thiolate links

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Abstract

Over the last decades, organosulfur compounds at the interface of noble metals have proved to be extremely versatile systems for both fundamental and applied research. However, the anchoring of thiols to gold remained an object of controversy for a long time. The RS–Au–SR linkage, in particular, is a robust bonding configuration that displays interesting properties. It is generated spontaneously at room temperature and can be used for the production of extended molecular nanostructures. In this work we explore the behavior of 1,4-bis(4-mercaptophenyl)benzene (BMB) on the Au(111) surface, which results in the formation of 2D crystalline metal–organic assemblies stabilized by this type of Au–thiolate bonds. We show how to control the thiolate's stereospecific bonding motif and thereby choose whether to form ordered arrays of Au3BMB3 units with embedded triangular nanopores or linearly stacked metal–organic chains. The former turn out to be thermodynamically favored structures and display confinement of the underneath Au(111) surface state. The electronic properties of single molecules as well as of the 2D crystalline self-assemblies have been characterized both on the metal–organic backbone and inside the associated pores.

Graphical abstract: Controlling the stereospecific bonding motif of Au–thiolate links

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Publication details

The article was received on 22 May 2019, accepted on 19 Jul 2019 and first published on 01 Aug 2019


Article type: Paper
DOI: 10.1039/C9NR04383G
Nanoscale, 2019,11, 15567-15575
  • Open access: Creative Commons BY-NC license
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    Controlling the stereospecific bonding motif of Au–thiolate links

    L. Colazzo, M. S. G. Mohammed, A. Gallardo, Z. M. Abd El-Fattah, J. A. Pomposo, P. Jelínek and D. G. de Oteyza, Nanoscale, 2019, 11, 15567
    DOI: 10.1039/C9NR04383G

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