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Werner S, Vollgraff T, Fan Q, Bania K, Gottfried JM, Sundermeyer J. Reductive O-triflylation of naphthalene diimide: access to alkyne- and amine-functionalized 2,7-diazapyrenes. Org Chem Front 2021. [DOI: 10.1039/d1qo00862e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A reductive one-pot triflylation and silylation of naphthalene diimide is presented. Post-functionalization of the 1,3,6,8-tetratriflato key compound leads to so far non-accessible UHV processable tetraalkynyl and tetraaminyl 2,7-diazapyrenes.
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Affiliation(s)
- Simon Werner
- Fachbereich Chemie and Material Science Center (WZMW), Philipps-Universität Marburg, Hans Meerwein Straße 4, 35032 Marburg, Germany
| | - Tobias Vollgraff
- Fachbereich Chemie and Material Science Center (WZMW), Philipps-Universität Marburg, Hans Meerwein Straße 4, 35032 Marburg, Germany
| | - Qitang Fan
- Fachbereich Chemie and Material Science Center (WZMW), Philipps-Universität Marburg, Hans Meerwein Straße 4, 35032 Marburg, Germany
| | - Kevin Bania
- Fachbereich Chemie and Material Science Center (WZMW), Philipps-Universität Marburg, Hans Meerwein Straße 4, 35032 Marburg, Germany
| | - J. Michael Gottfried
- Fachbereich Chemie and Material Science Center (WZMW), Philipps-Universität Marburg, Hans Meerwein Straße 4, 35032 Marburg, Germany
| | - Jörg Sundermeyer
- Fachbereich Chemie and Material Science Center (WZMW), Philipps-Universität Marburg, Hans Meerwein Straße 4, 35032 Marburg, Germany
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2
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Barhoumi R, Amokrane A, Klyatskaya S, Boero M, Ruben M, Bucher JP. Screening the 4f-electron spin of TbPc 2 single-molecule magnets on metal substrates by ligand channeling. NANOSCALE 2019; 11:21167-21179. [PMID: 31663092 DOI: 10.1039/c9nr05873g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Bis(phthalocyaninato)lanthanide (LnPc2) double-decker-based devices have recently attracted a great deal of interest for data encoding purposes. Although the 4f-electrons of lanthanide ions play a key role in the experimental methodology, their localized character, deeper in energy compared to the 3d electrons of transition metals, hampers a detailed investigation. Here, our approach consists of the follow-up of the entanglement process with other molecules and with the substrate electrons by means of space-resolved detection of the Kondo resonance by scanning tunneling spectroscopy (STS), using different substrates (from weak to strong interaction). It is found that TbPc2 molecules firstly interact with their environment by means of the π-radicals of the ligand. The radical spin of TbPc2 can be identified by STS on a weakly interacting substrate such as Au(111). In the case of a Ag(111) substrate, we are able to analyze the effect of an electron transfer on the molecule (pairing-up of the radical spin) and the subsequent quenching of the Kondo resonance. Finally, on a strongly interacting substrate such as Cu(111), a significant rearrangement of electrons takes place and the Kondo screening of the 4f electrons of the Tb ion of TbPc2 is observed. By comparative STS measurements on YPc2, that has empty 4d and 4f shells, we prove that the Kondo resonance measured in the center of the TbPc2 molecule indeed stems from the 4f-electrons. At the same time, we provide evidence for the hybridization of the 4f states with the π electron.
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Affiliation(s)
- Rabei Barhoumi
- Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67034 Strasbourg, France.
| | - Anis Amokrane
- Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67034 Strasbourg, France.
| | - Svetlana Klyatskaya
- Karlsruher Institut für Technologie, Institut für Nanotechnologie, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Mauro Boero
- Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67034 Strasbourg, France.
| | - Mario Ruben
- Karlsruher Institut für Technologie, Institut für Nanotechnologie, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Jean-Pierre Bucher
- Université de Strasbourg, CNRS, IPCMS UMR 7504, F-67034 Strasbourg, France.
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Zhang L, Zhang YQ, Chen Z, Lin T, Paszkiewicz M, Hellwig R, Huang T, Ruben M, Barth JV, Klappenberger F. On-Surface Activation of Trimethylsilyl-Terminated Alkynes on Coinage Metal Surfaces. Chemphyschem 2019; 20:2382-2393. [PMID: 31120616 DOI: 10.1002/cphc.201900249] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/14/2019] [Indexed: 11/11/2022]
Abstract
The controlled attachment of protecting groups combined with the ability to selectively abstract them is central to organic synthesis. The trimethylsilyl (TMS) functional group is a popular protecting group in solution. However, insights on its activation behavior under ultra-high vacuum (UHV) and surface-confined conditions are scarce. Here we investigate a series of TMS-protected alkyne precursors via scanning tunneling microscopy (STM) regarding their compatibility with organic molecular beam epitaxy (OMBE) and their potential deprotection on various coinage metal surfaces. After in-situ evaporation on the substrates held in UHV at room temperature, we find that all molecules arrived and adsorbed as intact units forming ordered supramolecular aggregates stabilized by non-covalent interactions. Thus, TMS-functionalized alkyne precursors with weights up to 1100 atomic mass units are stable against OMBE evaporation in UHV. Furthermore, the TMS activation through thermal annealing is investigated with STM and X-ray photoelectron spectroscopy (XPS). We observe that deprotection starts to occur between 400 K and 500 K on the copper and gold surfaces, respectively. In contrast, on silver surfaces, the TMS-alkyne bond remains stable up to temperatures where molecular desorption sets in (≈600 K). Hence, TMS functional groups can be utilized as leaving groups on copper and gold surfaces while they serve as protecting groups on silver surfaces.
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Affiliation(s)
- Liding Zhang
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany
| | - Yi-Qi Zhang
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany
| | - Zhi Chen
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344, Eggenstein-Leopoldshafen, Germany
| | - Tao Lin
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany.,College of New Materials and New Energies, Shenzhen Technology University, 518118, Shenzhen, China
| | - Mateusz Paszkiewicz
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany
| | - Raphael Hellwig
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany
| | - Tianjiao Huang
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany
| | - Mario Ruben
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344, Eggenstein-Leopoldshafen, Germany.,Département des Matériaux Organiques (DMO), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), 67034, Strasbourg, France
| | - Johannes V Barth
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany
| | - Florian Klappenberger
- Physics Department E20, Technical University of Munich (TUM), 85748, Garching, Germany
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Tuerhong R, Boero M, Bucher JP. Molecular attachment to a microscope tip: inelastic tunneling, Kondo screening, and thermopower. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:1243-1250. [PMID: 31293862 PMCID: PMC6604733 DOI: 10.3762/bjnano.10.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 06/06/2019] [Indexed: 06/09/2023]
Abstract
The vibrational excitation related transport properties of a manganese phthalocyanine molecule suspended between the tip of a scanning tunneling microsope (STM) and a surface are investigated by combining the local manipulation capabilities of the STM with inelastic electron tunneling spectroscopy. By attachment of the molecule to the probe tip, the intrinsic physical properties similar to those exhibited by a free standing molecule become accessible. This technique allows one to study locally the magnetic properties, as well as other elementary excitations and their mutual interaction. In particular a clear correlation is observed between the Kondo resonance and the vibrations with a strong incidence of the Kondo correlation on the thermopower measured across the single-molecule junction.
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Affiliation(s)
| | - Mauro Boero
- Université de Strasbourg, IPCMS UMR 70504, 67034 Strasbourg, France
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Huttmann F, Schleheck N, Atodiresei N, Michely T. On-Surface Synthesis of Sandwich Molecular Nanowires on Graphene. J Am Chem Soc 2017; 139:9895-9900. [DOI: 10.1021/jacs.7b03381] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Felix Huttmann
- II.
Physikalisches Institut, Universität zu Köln, Zülpicher
Straße 77, 50937 Köln, Germany
| | - Nicolas Schleheck
- II.
Physikalisches Institut, Universität zu Köln, Zülpicher
Straße 77, 50937 Köln, Germany
| | - Nicolae Atodiresei
- Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, 52428 Jülich, Germany
| | - Thomas Michely
- II.
Physikalisches Institut, Universität zu Köln, Zülpicher
Straße 77, 50937 Köln, Germany
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