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Rheinfrank E, Pörtner M, Nuñez Beyerle MDC, Haag F, Deimel PS, Allegretti F, Seufert K, Barth JV, Bocquet ML, Feulner P, Auwärter W. Actinide Coordination Chemistry on Surfaces: Synthesis, Manipulation, and Properties of Thorium Bis(porphyrinato) Complexes. J Am Chem Soc 2021; 143:14581-14591. [PMID: 34477375 DOI: 10.1021/jacs.1c04982] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Actinide-based metal-organic complexes and coordination architectures encompass intriguing properties and functionalities but are still largely unexplored on surfaces. We introduce the in situ synthesis of actinide tetrapyrrole complexes under ultrahigh-vacuum conditions, on both a metallic support and a 2D material. Specifically, exposure of a tetraphenylporphyrin (TPP) multilayer to an elemental beam of thorium followed by a temperature-programmed reaction and desorption of surplus molecules yields bis(porphyrinato)thorium (Th(TPP)2) assemblies on Ag(111) and hexagonal boron nitride/Cu(111). A multimethod characterization including X-ray photoelectron spectroscopy, scanning tunneling microscopy, temperature-programmed desorption, and complementary density functional theory modeling provides insights into conformational and electronic properties. Supramolecular assemblies of Th(TPP)2 as well as individual double-deckers are addressed with submolecular precision, e.g., demonstrating the reversible rotation of the top porphyrin in Th(TPP)2 by molecular manipulation. Our findings thus demonstrate prospects for actinide-based functional nanoarchitectures.
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27
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Bi H, Jing C, Hasch P, Gong Y, Gerster D, Barth JV, Reichert J. Single Molecules in Strong Optical Fields: A Variable-Temperature Molecular Junction Spectroscopy Setup. Anal Chem 2021; 93:9853-9859. [PMID: 34229433 DOI: 10.1021/acs.analchem.1c01633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In order to advance the development of molecular electronic devices, it is mandatory to improve the understanding of electron transport and functionalities in single molecules, integrated in a well-defined environment. However, limited information can be obtained by solely analyzing I-V characteristics, whence multiparameter studies are required to obtain more information on such systems including chemical bonds, geometry, and intramolecular strain. Therefore, we developed an analytical method incorporating an optical near-field technique, which allows us to investigate single-molecule junctions at variable temperatures in strong optical fields. An apertureless near-field emitter acts as a counter electrode and a plasmonic waveguide to focus surface plasmon polaritons into the molecular junctions, where a strongly enhanced evanescent field is confined to only a few nanometers around the apex of the tip. The proof of concept, even at low temperatures, is demonstrated by simultaneously investigating electronic and optical features of the molecule p-terphenyl-4,4″-dithiol in dependence of its charge state. This multichannel method can be employed to analyze a variety of nearly unexplored properties in single-molecule junctions such as photoconductance and photocurrent generation and allows a characterization of the molecular junctions by spectroscopic means as well.
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28
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Knecht P, Reichert J, Deimel PS, Feulner P, Haag F, Allegretti F, Garnica M, Schwarz M, Auwärter W, Ryan PTP, Lee T, Duncan DA, Seitsonen AP, Barth JV, Papageorgiou AC. Conformational Control of Chemical Reactivity for Surface-Confined Ru-Porphyrins. Angew Chem Int Ed Engl 2021; 60:16561-16567. [PMID: 33938629 PMCID: PMC8362151 DOI: 10.1002/anie.202104075] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/29/2021] [Indexed: 11/24/2022]
Abstract
We assess the crucial role of tetrapyrrole flexibility in the CO ligation to distinct Ru-porphyrins supported on an atomistically well-defined Ag(111) substrate. Our systematic real-space visualisation and manipulation experiments with scanning tunnelling microscopy directly probe the ligation, while bond-resolving atomic force microscopy and X-ray standing-wave measurements characterise the geometry, X-ray and ultraviolet photoelectron spectroscopy the electronic structure, and temperature-programmed desorption the binding strength. Density-functional-theory calculations provide additional insight into the functional interface. We unambiguously demonstrate that the substituents regulate the interfacial conformational adaptability, either promoting or obstructing the uptake of axial CO adducts.
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29
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Knecht P, Reichert J, Deimel PS, Feulner P, Haag F, Allegretti F, Garnica M, Schwarz M, Auwärter W, Ryan PTP, Lee T, Duncan DA, Seitsonen AP, Barth JV, Papageorgiou AC. Conformational Control of Chemical Reactivity for Surface‐Confined Ru‐Porphyrins. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Guo Y, Jiang L, Seitsonen AP, Zhang B, Reichert J, Papageorgiou AC, Barth JV. Interaction of cyclosporin A molecules with alkali and transition metal atoms on Cu(111). Chem Commun (Camb) 2021; 57:2923-2926. [PMID: 33620361 DOI: 10.1039/d1cc00125f] [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
The structure of a cyclic peptide with important biological functionalities, cyclosporin A (CsA), is investigated at the single molecule level. Its adsorption on Cu(111) under ultra-high vacuum is characterised with scanning tunnelling microscopy (STM) and density functional theory. With STM investigations, we demonstrate element specific on-surface coordination schemes of CsA with coadsorbed K, Co and Fe atoms. Thus, clear insights emerge in the behaviour of cyclic peptides at interfaces and their interactions with different metal atoms, providing control of the adsorption structure and assembly and paving the way for the integration of cyclic peptides in functional metal-organic nanostructures on surfaces.
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31
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Knecht P, Zhang B, Reichert J, Duncan DA, Schwarz M, Haag F, Ryan PTP, Lee TL, Deimel PS, Feulner P, Allegretti F, Auwärter W, Médard G, Seitsonen AP, Barth JV, Papageorgiou AC. Assembly and Manipulation of a Prototypical N-Heterocyclic Carbene with a Metalloporphyrin Pedestal on a Solid Surface. J Am Chem Soc 2021; 143:4433-4439. [DOI: 10.1021/jacs.1c01229] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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32
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Hu W, Zhang H, Cheng P, Chen L, Chen Z, Klyatskaya S, Ruben M, Barth JV, Wu K, Zhang YQ. Creating supramolecular semiregular Archimedean tilings via gas-mediated deprotonation of a terminal alkyne derivative. CrystEngComm 2021. [DOI: 10.1039/d1ce01413g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Combining surface-confined reactions with supramolecular self-assembly allows the chemical transformation of simple molecular precursors into higher-level tectons to generate complex tessellations with unique structural and functional properties.
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33
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Deimel PS, Aguilar PC, Paszkiewicz M, Duncan DA, Barth JV, Klappenberger F, Schöfberger W, Allegretti F. Stabilisation of tri-valent ions with a vacant coordination site at a corrole-metal interface. Chem Commun (Camb) 2020; 56:11219-11222. [PMID: 32818220 DOI: 10.1039/d0cc03947k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By exploiting an established on-surface metallation strategy, we address the ability of the corrolic macrocycle to stabilise transition metal ions in high-valent (III) oxidation states in metal-supported molecular layers. This approach offers a route to engineer adsorbed metal complexes that cannot be easily fabricated by organic synthesis methods and bear a vacant axial coordination site for catalytic conversions.
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34
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Ryan PTP, Lalaguna PL, Haag F, Braim MM, Ding P, Payne DJ, Barth JV, Lee TL, Woodruff DP, Allegretti F, Duncan DA. Validation of the inverted adsorption structure for free-base tetraphenyl porphyrin on Cu(111). Chem Commun (Camb) 2020; 56:3681-3684. [PMID: 32118210 DOI: 10.1039/c9cc09638h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Utilising normal incidence X-ray standing waves we rigourously scrutinise the "inverted model" as the adsorption structure of free-base tetraphenyl porphyrin on Cu(111). We demonstrate that the iminic N atoms are anchored at near-bridge adsorption sites on the surface displaced laterally by 1.1 ± 0.2 Å in excellent agreement with previously published calculations.
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Riss A, Richter M, Paz AP, Wang XY, Raju R, He Y, Ducke J, Corral E, Wuttke M, Seufert K, Garnica M, Rubio A, V Barth J, Narita A, Müllen K, Berger R, Feng X, Palma CA, Auwärter W. Polycyclic aromatic chains on metals and insulating layers by repetitive [3+2] cycloadditions. Nat Commun 2020; 11:1490. [PMID: 32198456 PMCID: PMC7083871 DOI: 10.1038/s41467-020-15210-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Accepted: 02/24/2020] [Indexed: 12/03/2022] Open
Abstract
The vast potential of organic materials for electronic, optoelectronic and spintronic devices entails substantial interest in the fabrication of π-conjugated systems with tailored functionality directly at insulating interfaces. On-surface fabrication of such materials on non-metal surfaces remains to be demonstrated with high yield and selectivity. Here we present the synthesis of polyaromatic chains on metallic substrates, insulating layers, and in the solid state. Scanning probe microscopy shows the formation of azaullazine repeating units on Au(111), Ag(111), and h-BN/Cu(111), stemming from intermolecular homo-coupling via cycloaddition reactions of CN-substituted polycyclic aromatic azomethine ylide (PAMY) intermediates followed by subsequent dehydrogenation. Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry demonstrates that the reaction also takes place in the solid state in the absence of any catalyst. Such intermolecular cycloaddition reactions are promising methods for direct synthesis of regioregular polyaromatic polymers on arbitrary insulating surfaces.
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Zhang R, Liu J, Gao Y, Hua M, Xia B, Knecht P, Papageorgiou AC, Reichert J, Barth JV, Xu H, Huang L, Lin N. On‐surface Synthesis of a Semiconducting 2D Metal–Organic Framework Cu
3
(C
6
O
6
) Exhibiting Dispersive Electronic Bands. Angew Chem Int Ed Engl 2020; 59:2669-2673. [DOI: 10.1002/anie.201913698] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Indexed: 11/06/2022]
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37
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Bi H, Palma CA, Gong Y, Stallhofer K, Nuber M, Jing C, Meggendorfer F, Wen S, Yam C, Kienberger R, Elbing M, Mayor M, Iglev H, Barth JV, Reichert J. Electron–Phonon Coupling in Current-Driven Single-Molecule Junctions. J Am Chem Soc 2020; 142:3384-3391. [DOI: 10.1021/jacs.9b07757] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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38
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Jing C, Zhang B, Synkule S, Ebrahimi M, Riss A, Auwärter W, Jiang L, Médard G, Reichert J, Barth JV, Papageorgiou AC. Snapshots of Dynamic Adaptation: Two-Dimensional Molecular Architectonics with Linear Bis-Hydroxamic Acid Modules. Angew Chem Int Ed Engl 2019; 58:18948-18956. [PMID: 31671244 PMCID: PMC6973039 DOI: 10.1002/anie.201912247] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Indexed: 12/13/2022]
Abstract
Linear modules equipped with two terminal hydroxamic acid groups act as the building block of diverse two-dimensional supramolecular motifs and patterns with room-temperature stability on the close-packed single-crystal surfaces of silver and gold, revealing a complex self-assembly scenario. By combining multiple investigation techniques (scanning tunneling microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and density functional theory calculations), we analyze the characteristics of the ordered assemblies which range from close-packed structures to polyporous networks featuring an exceptionally extended primitive unit cell with a side length exceeding 7 nm. The polyporous network shows potential for hosting and promoting the formation of chiral supramolecules, whereas a transition from 1D chiral randomness to an ordered racemate is discovered in a different porous phase. We correlate the observed structural changes to the adaptivity of the building block and surface-induced changes in the chemical state of the hydroxamic acid functional group.
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Jing C, Zhang B, Synkule S, Ebrahimi M, Riss A, Auwärter W, Jiang L, Médard G, Reichert J, Barth JV, Papageorgiou AC. Frontispiece: Snapshots of Dynamic Adaptation: Two‐Dimensional Molecular Architectonics with Linear Bis‐Hydroxamic Acid Modules. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/anie.201985262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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40
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Jing C, Zhang B, Synkule S, Ebrahimi M, Riss A, Auwärter W, Jiang L, Médard G, Reichert J, Barth JV, Papageorgiou AC. Frontispiz: Snapshots of Dynamic Adaptation: Two‐Dimensional Molecular Architectonics with Linear Bis‐Hydroxamic Acid Modules. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201985262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Jing C, Zhang B, Synkule S, Ebrahimi M, Riss A, Auwärter W, Jiang L, Médard G, Reichert J, Barth JV, Papageorgiou AC. Snapshots of Dynamic Adaptation: Two‐Dimensional Molecular Architectonics with Linear Bis‐Hydroxamic Acid Modules. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912247] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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42
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Riemensberger J, Neppl S, Potamianos D, Schäffer M, Schnitzenbaumer M, Ossiander M, Schröder C, Guggenmos A, Kleineberg U, Menzel D, Allegretti F, Barth JV, Kienberger R, Feulner P, Borisov AG, Echenique PM, Kazansky AK. Attosecond Dynamics of sp-Band Photoexcitation. PHYSICAL REVIEW LETTERS 2019; 123:176801. [PMID: 31702261 DOI: 10.1103/physrevlett.123.176801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 06/03/2019] [Indexed: 06/10/2023]
Abstract
We report measurements of the temporal dynamics of the valence band photoemission from the magnesium (0001) surface across the resonance of the Γ[over ¯] surface state at 134 eV and link them to observations of high-resolution synchrotron photoemission and numerical calculations of the time-dependent Schrödinger equation using an effective single-electron model potential. We observe a decrease in the time delay between photoemission from delocalized valence states and the localized core orbitals on resonance. Our approach to rigorously link excitation energy-resolved conventional steady-state photoemission with attosecond streaking spectroscopy reveals the connection between energy-space properties of bound electronic states and the temporal dynamics of the fundamental electronic excitations underlying the photoelectric effect.
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43
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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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Paintner T, Björk J, Du P, Klyatskaya S, Paszkiewicz M, Hellwig R, Uphoff M, Öner MA, Cuniberto E, Deimel PS, Zhang YQ, Palma CA, Allegretti F, Ruben M, Barth JV, Klappenberger F. Quantum Tunneling Mediated Interfacial Synthesis of a Benzofuran Derivative. Angew Chem Int Ed Engl 2019; 58:11285-11290. [PMID: 31120567 DOI: 10.1002/anie.201904030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Indexed: 11/05/2022]
Abstract
Reaction pathways involving quantum tunneling of protons are fundamental to chemistry and biology. They are responsible for essential aspects of interstellar synthesis, the degradation and isomerization of compounds, enzymatic activity, and protein dynamics. On-surface conditions have been demonstrated to open alternative routes for organic synthesis, often with intricate transformations not accessible in solution. Here, we investigate a hydroalkoxylation reaction of a molecular species adsorbed on a Ag(111) surface by scanning tunneling microscopy complemented by X-ray electron spectroscopy and density functional theory. The closure of the furan ring proceeds at low temperature (down to 150 K) and without detectable side reactions. We unravel a proton-tunneling-mediated pathway theoretically and confirm experimentally its dominant contribution through the kinetic isotope effect with the deuterated derivative.
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45
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Urgel JI, Écija D, Vijayaraghavan S, Pörtner M, Bocquet M, Auwärter W, Barth JV. In‐Situ Growth of Gadolinium Phthalocyaninato Sandwich Complexes on the Ag(111) Surface. Chemphyschem 2019; 20:2301-2304. [DOI: 10.1002/cphc.201900253] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 06/11/2019] [Indexed: 11/08/2022]
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46
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Paintner T, Björk J, Du P, Klyatskaya S, Paszkiewicz M, Hellwig R, Uphoff M, Öner MA, Cuniberto E, Deimel PS, Zhang Y, Palma C, Allegretti F, Ruben M, Barth JV, Klappenberger F. Quantum Tunneling Mediated Interfacial Synthesis of a Benzofuran Derivative. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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47
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Chen Z, Lin T, Zhang L, Zhang L, Xiang B, Xu H, Klappenberger F, Barth JV, Klyatskaya S, Ruben M. Surface‐Dependent Chemoselectivity in C−C Coupling Reactions. Angew Chem Int Ed Engl 2019; 58:8356-8361. [DOI: 10.1002/anie.201900636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 04/05/2019] [Indexed: 11/06/2022]
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48
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Deimel PS, Feulner P, Barth JV, Allegretti F. Spatial decoupling of macrocyclic metal-organic complexes from a metal support: a 4-fluorothiophenol self-assembled monolayer as a thermally removable spacer. Phys Chem Chem Phys 2019; 21:10992-11003. [PMID: 31106802 DOI: 10.1039/c9cp01583c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The precise control over the electronic properties and function of metal centres in metal-organic complexes such as metallo-porphyrins (MPs) and metallo-phthalocyanines (MPcs) holds promise for their targeted application in, e.g., nanoscale chemical conversion devices and molecular sensors. However, when immobilizing these flat chelate complexes on solid supports, the influence of the latter on the metal centres can decisively alter their chemistry and functional properties, e.g. through charge transfer and orbital hybridization on metal substrates. In the present work we explore a simple strategy to both spatially and electronically decouple prototypical MP and MPc compounds from a Ag(111) surface, by preventing direct physical contact with the underlying support via insertion of a self-assembled monolayer (SAM) of 4-fluorothiophenol (4-FTP). This spacer layer can be important to preserve the molecular properties of adsorbed MPs and MPcs and to design hybrid functional systems of increasing sophistication such as stacked multilayer architectures. Herein, we show that at low temperature (∼150 K) the 4-FTP SAM on Ag(111) can indeed serve to decouple iron-phthalocyanine (FePc) and ruthenium-tetraphenylporphyrin (Ru(CO)TPP) monolayers from the Ag(111) surface. When the temperature is increased, however, the system's configuration breaks down, resulting in an inverted stacking followed by the complete removal of 4-FTP at elevated temperatures. The SAM can thus play the role of a thermally removable spacer. We elucidate the structural and chemical evolution of the organic double-layer system by combination of X-ray photoelectron spectroscopy (XPS), temperature-programmed XPS (TP-XPS), temperature-programmed desorption (TPD), and low-energy electron diffraction (LEED) measurements.
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49
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Chen Z, Lin T, Zhang L, Zhang L, Xiang B, Xu H, Klappenberger F, Barth JV, Klyatskaya S, Ruben M. Surface‐Dependent Chemoselectivity in C−C Coupling Reactions. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Zhang YQ, Paintner T, Hellwig R, Haag F, Allegretti F, Feulner P, Klyatskaya S, Ruben M, Seitsonen AP, Barth JV, Klappenberger F. Synthesizing Highly Regular Single-Layer Alkynyl–Silver Networks at the Micrometer Scale via Gas-Mediated Surface Reaction. J Am Chem Soc 2019; 141:5087-5091. [DOI: 10.1021/jacs.8b13547] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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