Volume 22, Issue 37 pp. 13218-13235
Full Paper

Importance of the Anchor Group Position (Para versus Meta) in Tetraphenylmethane Tripods: Synthesis and Self-Assembly Features

Marcin Lindner

Marcin Lindner

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

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Dr. Michal Valášek

Dr. Michal Valášek

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

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Jan Homberg

Jan Homberg

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

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Kevin Edelmann

Kevin Edelmann

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

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Dr. Lukas Gerhard

Dr. Lukas Gerhard

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

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Prof. Dr. Wulf Wulfhekel

Prof. Dr. Wulf Wulfhekel

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

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Dr. Olaf Fuhr

Dr. Olaf Fuhr

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

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Tobias Wächter

Tobias Wächter

Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany

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Prof. Dr. Michael Zharnikov

Prof. Dr. Michael Zharnikov

Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany

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Dr. Viliam Kolivoška

Dr. Viliam Kolivoška

J. Heyrovský Institute of Physical Chemistry of ASCR v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic

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Dr. Lubomír Pospíšil

Dr. Lubomír Pospíšil

J. Heyrovský Institute of Physical Chemistry of ASCR v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic

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Dr. Gábor Mészáros

Dr. Gábor Mészáros

Research Centre for Natural Sciences, HAS, Magyar tudósok krt. 2, 1117 Budapest, Hungary

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Dr. Magdaléna Hromadová

Dr. Magdaléna Hromadová

J. Heyrovský Institute of Physical Chemistry of ASCR v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic

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Prof. Dr. Marcel Mayor

Corresponding Author

Prof. Dr. Marcel Mayor

Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), P. O. Box 3640, 76021 Karlsruhe, Germany

Lehn Institute of Functional Materials (LIFM), Sun Yat-Sen University (SYSU), XinGangXi Rd. 135, 510275 Guangzhou, P. R. China

Department of Chemistry, University of Basel, St. Johannsring 19, 4056 Basel, Switzerland

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First published: 09 August 2016
Citations: 40

Graphical Abstract

Tripod architectures: The film-forming properties of tripodal tetraphenylmethanes are determined by the choice of the anchor group positions (see figure). The self-assembly features and properties of both meta and para derivatives are analyzed through a range of techniques.

Abstract

The efficient synthesis of tripodal platforms based on tetraphenylmethane with three acetyl-protected thiol groups in either meta or para positions relative to the central sp3 carbon for deposition on Au (111) surfaces is reported. These platforms are intended to provide a vertical arrangement of the substituent in position 4 of the perpendicular phenyl ring and an electronic coupling to the gold substrate. The self-assembly features of both derivatives are analyzed on Au (111) surfaces by low-temperature ultra-high-vacuum STM, high-resolution X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, and reductive voltammetric desorption studies. These experiments indicated that the meta derivative forms a well-ordered monolayer, with most of the anchoring groups bound to the surface, whereas the para derivative forms a multilayer film with physically adsorbed adlayers on the chemisorbed para monolayer. Single-molecule conductance values for both tripodal platforms are obtained through an STM break junction experiment.