1
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Zeng Y, Lemay JC, Dong Y, Garcia J, Groves MN, McBreen PH. Ligand-Assisted Carbonyl Bond Activation in Single Diastereomeric Complexes on Platinum. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Yang Zeng
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Jean-Christian Lemay
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Yi Dong
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
| | - James Garcia
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92831, United States
| | - Michael. N Groves
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92831, United States
| | - Peter H. McBreen
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
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2
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Zaera F. Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts? Chem Rev 2022; 122:8594-8757. [PMID: 35240777 DOI: 10.1021/acs.chemrev.1c00905] [Citation(s) in RCA: 66] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A critical review of different prominent nanotechnologies adapted to catalysis is provided, with focus on how they contribute to the improvement of selectivity in heterogeneous catalysis. Ways to modify catalytic sites range from the use of the reversible or irreversible adsorption of molecular modifiers to the immobilization or tethering of homogeneous catalysts and the development of well-defined catalytic sites on solid surfaces. The latter covers methods for the dispersion of single-atom sites within solid supports as well as the use of complex nanostructures, and it includes the post-modification of materials via processes such as silylation and atomic layer deposition. All these methodologies exhibit both advantages and limitations, but all offer new avenues for the design of catalysts for specific applications. Because of the high cost of most nanotechnologies and the fact that the resulting materials may exhibit limited thermal or chemical stability, they may be best aimed at improving the selective synthesis of high value-added chemicals, to be incorporated in organic synthesis schemes, but other applications are being explored as well to address problems in energy production, for instance, and to design greener chemical processes. The details of each of these approaches are discussed, and representative examples are provided. We conclude with some general remarks on the future of this field.
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, United States
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3
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Stolz S, Danese M, Di Giovannantonio M, Urgel JI, Sun Q, Kinikar A, Bommert M, Mishra S, Brune H, Gröning O, Passerone D, Widmer R. Asymmetric Elimination Reaction on Chiral Metal Surfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2104481. [PMID: 34613643 DOI: 10.1002/adma.202104481] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 09/19/2021] [Indexed: 06/13/2023]
Abstract
The production of enantiopure materials and molecules is of uttermost relevance in research and industry in numerous contexts, ranging from nonlinear optics to asymmetric synthesis. In the context of the latter, dehalogenation, which is an essential reaction step for a broad class of chemical reactions, is investigated; specifically, dehalogenation of prochiral 5-bromo-7-methylbenz(a)anthracene (BMA) on prototypical, chiral, intermetallic PdGa{111} surfaces under ultrahigh vacuum conditions. Asymmetric halogen elimination is demonstrated by combining temperature-programmed X-ray photoelectron spectroscopy, scanning probe microscopy, and density functional theory. On the PdGa{111} surfaces, the difference in debromination temperatures for the two BMA surface enantiomers amounts up to an unprecedented 46 K. The significant dependence of the dehalogenation temperature of the BMA surface enantiomers on the atomic termination of the PdGa{111} surfaces implies that the ensemble effect is pronounced in this reaction step. These findings evidence enantiospecific control and hence promote intrinsically chiral crystals for asymmetric on-surface synthesis.
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Affiliation(s)
- Samuel Stolz
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland
| | - Martina Danese
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Marco Di Giovannantonio
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - José I Urgel
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Qiang Sun
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Amogh Kinikar
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Max Bommert
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Shantanu Mishra
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Harald Brune
- Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland
| | - Oliver Gröning
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Daniele Passerone
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
| | - Roland Widmer
- Nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf, CH-8600, Switzerland
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4
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Tamura M, Hayashigami N, Nakayama A, Nakagawa Y, Tomishige K. Heterogeneous Enantioselective Hydrogenation of Ketones by 2-Amino-2′-hydroxy-1,1′-binaphthyl-Modified CeO2-Supported Ir Nanoclusters. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masazumi Tamura
- Research Center for Artificial Photosynthesis, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Nao Hayashigami
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - Akira Nakayama
- Department of Chemical System Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yoshinao Nakagawa
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
| | - Keiichi Tomishige
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
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5
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Meier D, Adak AK, Knecht P, Reichert J, Mondal S, Suryadevara N, Kuppusamy SK, Eguchi K, Muntwiler MK, Allegretti F, Ruben M, Barth JV, Narasimhan S, Papageorgiou AC. Rotation in an Enantiospecific Self‐Assembled Array of Molecular Raffle Wheels. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107708] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dennis Meier
- Physics Department E20 Technical University of Munich (TUM) James Franck Strasse 1 85748 Garching Germany
| | - Abhishek K. Adak
- Theoretical Sciences Unit & School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Bangalore 560054 India
| | - Peter Knecht
- Physics Department E20 Technical University of Munich (TUM) James Franck Strasse 1 85748 Garching Germany
| | - Joachim Reichert
- Physics Department E20 Technical University of Munich (TUM) James Franck Strasse 1 85748 Garching Germany
| | - Sourav Mondal
- Theoretical Sciences Unit & School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Bangalore 560054 India
| | - Nithin Suryadevara
- Institute of Nanotechnology Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Senthil Kumar Kuppusamy
- Institute for Quantum Materials and Technologies Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Keitaro Eguchi
- Physics Department E20 Technical University of Munich (TUM) James Franck Strasse 1 85748 Garching Germany
| | | | - Francesco Allegretti
- Physics Department E20 Technical University of Munich (TUM) James Franck Strasse 1 85748 Garching Germany
| | - Mario Ruben
- Institute of Nanotechnology Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
- Institute for Quantum Materials and Technologies Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
- Centre Européen de Sciences Quantiques (CESQ) Institut de Science et d'Ingénierie Supramoléculaires (ISIS) 8 allée Gaspard Monge, BP 70028 67083 Strasbourg Cedex France
| | - Johannes V. Barth
- Physics Department E20 Technical University of Munich (TUM) James Franck Strasse 1 85748 Garching Germany
| | - Shobhana Narasimhan
- Theoretical Sciences Unit & School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Bangalore 560054 India
| | - Anthoula C. Papageorgiou
- Physics Department E20 Technical University of Munich (TUM) James Franck Strasse 1 85748 Garching Germany
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6
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7
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Meier D, Adak AK, Knecht P, Reichert J, Mondal S, Suryadevara N, Kuppusamy SK, Eguchi K, Muntwiler MK, Allegretti F, Ruben M, Barth JV, Narasimhan S, Papageorgiou AC. Rotation in an Enantiospecific Self-Assembled Array of Molecular Raffle Wheels. Angew Chem Int Ed Engl 2021; 60:26932-26938. [PMID: 34555241 PMCID: PMC9299480 DOI: 10.1002/anie.202107708] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 09/21/2021] [Indexed: 11/09/2022]
Abstract
Tailored nano-spaces can control enantioselective adsorption and molecular motion. We report on the spontaneous assembly of a dynamic system-a rigid kagome network with each pore occupied by a guest molecule-employing solely 2,6-bis(1H-pyrazol-1-yl)pyridine-4-carboxylic acid on Ag(111). The network cavity snugly hosts the chemically modified guest, bestows enantiomorphic adsorption and allows selective rotational motions. Temperature-dependent scanning tunnelling microscopy studies revealed distinct anchoring orientations of the guest unit switching with a 0.95 eV thermal barrier. H-bonding between the guest and the host transiently stabilises the rotating guest, as the flapper on a raffle wheel. Density functional theory investigations unravel the detailed molecular pirouette of the guest and how the energy landscape is determined by H-bond formation and breakage. The origin of the guest's enantiodirected, dynamic anchoring lies in the specific interplay of the kagome network and the silver surface.
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Affiliation(s)
- Dennis Meier
- Physics Department E20, Technical University of Munich (TUM), James Franck Strasse 1, 85748, Garching, Germany
| | - Abhishek K Adak
- Theoretical Sciences Unit & School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore, 560054, India
| | - Peter Knecht
- Physics Department E20, Technical University of Munich (TUM), James Franck Strasse 1, 85748, Garching, Germany
| | - Joachim Reichert
- Physics Department E20, Technical University of Munich (TUM), James Franck Strasse 1, 85748, Garching, Germany
| | - Sourav Mondal
- Theoretical Sciences Unit & School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore, 560054, India
| | - Nithin Suryadevara
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Senthil Kumar Kuppusamy
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Keitaro Eguchi
- Physics Department E20, Technical University of Munich (TUM), James Franck Strasse 1, 85748, Garching, Germany
| | | | - Francesco Allegretti
- Physics Department E20, Technical University of Munich (TUM), James Franck Strasse 1, 85748, Garching, Germany
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Centre Européen de Sciences Quantiques (CESQ), Institut de Science et d'Ingénierie Supramoléculaires (ISIS), 8 allée Gaspard Monge, BP 70028, 67083, Strasbourg Cedex, France
| | - Johannes V Barth
- Physics Department E20, Technical University of Munich (TUM), James Franck Strasse 1, 85748, Garching, Germany
| | - Shobhana Narasimhan
- Theoretical Sciences Unit & School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore, 560054, India
| | - Anthoula C Papageorgiou
- Physics Department E20, Technical University of Munich (TUM), James Franck Strasse 1, 85748, Garching, Germany
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8
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Dery S, Bellotti P, Ben-Tzvi T, Freitag M, Shahar T, Cossaro A, Verdini A, Floreano L, Glorius F, Gross E. Influence of N-Substituents on the Adsorption Geometry of OH-Functionalized Chiral N-Heterocyclic Carbenes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:10029-10035. [PMID: 34370475 PMCID: PMC9234974 DOI: 10.1021/acs.langmuir.1c01199] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Adsorption of chiral molecules on heterogeneous catalysts is a simple approach for inducing an asymmetric environment to enable enantioselective reactivity. Although the concept of chiral induction is straightforward, its practical utilization is far from simple, and only a few examples toward the successful chiral induction by surface anchoring of asymmetric modifiers have been demonstrated so far. Elucidating the factors that lead to successful chiral induction is therefore a crucial step for understanding the mechanism by which chirality is transferred. Herein, we identify the adsorption geometry of OH-functionalized N-heterocyclic carbenes (NHCs), which are chemical analogues to chiral modifiers that successfully promoted α-arylation reactions once anchored on Pd nanoparticles. Polarized near-edge X-ray absorption fine structure (NEXAFS) measurements on Pd(111) revealed that NHCs that were associated with low enantioselectivity were characterized with a well-ordered structure, in which the imidazole ring was vertically positioned and the OH-functionalized side arms were flat-lying. OH-functionalized NHCs that were associated with high enantioselectivity revealed a disordered/flexible adsorption geometry, which potentially enabled better interaction between the OH group and the prochiral reactant.
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Affiliation(s)
- Shahar Dery
- Institute
of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 91904, Israel
| | - Peter Bellotti
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität
Münster, Münster 48149, Germany
| | - Tzipora Ben-Tzvi
- Institute
of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 91904, Israel
| | - Matthias Freitag
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität
Münster, Münster 48149, Germany
| | - Tehila Shahar
- Institute
of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 91904, Israel
| | - Albano Cossaro
- CNR-IOM,
Laboratorio Nazionale TASC, Basovizza SS-14, Trieste 34012, Italy
| | - Alberto Verdini
- CNR-IOM,
Laboratorio Nazionale TASC, Basovizza SS-14, Trieste 34012, Italy
| | - Luca Floreano
- CNR-IOM,
Laboratorio Nazionale TASC, Basovizza SS-14, Trieste 34012, Italy
| | - Frank Glorius
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität
Münster, Münster 48149, Germany
| | - Elad Gross
- Institute
of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 91904, Israel
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9
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Asymmetric azide-alkyne Huisgen cycloaddition on chiral metal surfaces. Commun Chem 2021; 4:51. [PMID: 36697612 PMCID: PMC9814088 DOI: 10.1038/s42004-021-00488-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 03/09/2021] [Indexed: 01/28/2023] Open
Abstract
Achieving fundamental understanding of enantioselective heterogeneous synthesis is marred by the permanent presence of multitudinous arrangements of catalytically active sites in real catalysts. In this study, we address this issue by using structurally comparatively simple, well-defined, and chiral intermetallic PdGa{111} surfaces as catalytic substrates. We demonstrate the impact of chirality transfer and ensemble effect for the thermally activated azide-alkyne Huisgen cycloaddition between 3-(4-azidophenyl)propionic acid and 9-ethynylphenanthrene on these threefold symmetric intermetallic surfaces under ultrahigh vacuum conditions. Specifically, we encounter a dominating ensemble effect for this reaction as on the Pd3-terminated PdGa{111} surfaces no stable heterocoupled structures are created, while on the Pd1-terminated PdGa{111} surfaces, the cycloaddition proceeds regioselectively. Moreover, we observe chirality transfer from the substrate to the reaction products, as they are formed enantioselectively on the Pd1-terminated PdGa{111} surfaces. Our results evidence a determinant ensemble effect and the immense potential of PdGa as asymmetric heterogeneous catalyst.
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10
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Dutta S, Yun Y, Widom M, Gellman AJ. 2D Ising Model for Adsorption-induced Enantiopurification of Racemates. Chemphyschem 2020; 22:197-203. [PMID: 33336873 DOI: 10.1002/cphc.202000881] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Indexed: 11/10/2022]
Abstract
Mechanisms for the spontaneous transformation of achiral chemical systems into states of enantiomeric purity have important ramifications in modern pharmacology and potential relevance to the origins of homochirality in life on Earth. Such mechanisms for enantiopurification are needed for production of chiral pharmaceuticals and other bioactive compounds. Previously proposed chemical mechanisms leading from achiral systems to near homochirality are initiated by a symmetry-breaking step resulting in a minor excess of one enantiomer via statistical fluctuations in enantiomer concentrations. Subsequent irreversible processes then amplify the majority enantiomer concentration while simultaneously suppressing minority enantiomer production. Herein, equilibrium adsorption of amino acid enantiomer mixtures onto chiral and achiral surfaces reveals amplification of surface enantiomeric excess relative to the gas phase; i. e. enantiopurification of chiral adsorbates by adsorption. This adsorption-induced amplification of enantiomeric excess is shown to be well-describe by the 2D Ising model. More importantly, the 2D-Ising model predicts formation of homochiral monolayers from adsorption of racemic mixtures or prochiral molecules on achiral surfaces; i. e. enantiopurification with no apparent chiral driving force.
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Affiliation(s)
- Soham Dutta
- Department of Chemical Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA
| | - Yongju Yun
- Department of Chemical Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA.,Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Geongbyuk, 37673, Republic of Korea
| | - Michael Widom
- Department of Physics, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA, 15213, USA
| | - Andrew J Gellman
- Department of Chemical Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA.,W.E. Scott Institute for Energy Innovation, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA
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11
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Attia S, Spadafora EJ, Schmidt MC, Schröder C, Baumann AK, Schauermann S. Adsorption geometry and self-assembling of chiral modifier (R)-(+)-1-(1-naphthylethylamine) on Pt(111). Phys Chem Chem Phys 2020; 22:15696-15706. [PMID: 32618972 DOI: 10.1039/d0cp01946a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A mechanistic study on interaction of a chiral modifier - (R)-(+)-1-(1-naphthylethylamine) (R-NEA) - with a single crystalline Pt(111) surface is reported. The details of the adsorption geometry of individual R-NEA molecules and their intermolecular interactions are addressed by combination of infrared reflection absorption spectroscopy (IRAS) and scanning tunneling microscopy (STM). The spectroscopic observations suggest that the molecules are tilted with respect to the underlying metal substrate with the long axis of the naphthyl ring being parallel and the short axis tilted with respect to the surface. In the medium coverage range, formation of directed 3-5 membered chains was observed by STM for the first time, which points to intermolecular bonding between individual molecules and might account for an unusual tilted adsorption geometry deduced from the IR spectra. Based on the STM images revealing the atomic structure of the Pt grid close to the R-NEA chains, we propose the adsorption configuration of NEA fitting both the IRAS and STM data. The obtained results suggest that this strong intermolecular interaction energetically stabilizes the tilted adsorption geometry of the naphthyl ring, which otherwise would be expected to lie flat on the metal to maximize the dispersive interactions. At the coverage close to saturation, R-NEA builds a self-assembled overlayer with hexagonal symmetry, exhibiting intermolecular distances larger than in the directed chains.
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Affiliation(s)
- Smadar Attia
- Institute of Physical Chemistry, Christian-Albrechts-University, Kiel Max-Eyth-Str. 2, 24118 Kiel, Germany.
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12
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Lemay JC, Dong Y, Albert V, Inouye M, Groves MN, Boukouvalas J, McBreen PH. Relative Abundances of Surface Diastereomeric Complexes Formed by Two Chiral Modifiers That Differ by a Methyl Group. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04682] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
| | - Yi Dong
- CCVC et Département de Chimie, Université Laval, Québec, Quebec G1V 0A6, Canada
| | - Vincent Albert
- CCVC et Département de Chimie, Université Laval, Québec, Quebec G1V 0A6, Canada
| | - Monica Inouye
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92831, United States
| | - Michael N. Groves
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92831, United States
| | - John Boukouvalas
- CCVC et Département de Chimie, Université Laval, Québec, Quebec G1V 0A6, Canada
| | - Peter H. McBreen
- CCVC et Département de Chimie, Université Laval, Québec, Quebec G1V 0A6, Canada
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13
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14
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Larson AM, Groden K, Hannagan RT, McEwen JS, Sykes ECH. Understanding Enantioselective Interactions by Pulling Apart Molecular Rotor Complexes. ACS NANO 2019; 13:5939-5946. [PMID: 31070888 DOI: 10.1021/acsnano.9b01781] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Enantioselective interactions underpin many important phenomena from biological mechanisms to chemical catalysis. In this regard, there is great interest in understanding these effects at the molecular level. Surfaces provide a platform for these studies and aid in the long-term goal of designing heterogeneous enantiospecific interfaces. Herein we report a model system consisting of molecular rotors, one intrinsically chiral (propylene oxide) and one that becomes chiral when adsorbed on a surface (propene). Scanning tunneling microscopy (STM) measurements enable the chirality of each individual molecule to be directly visualized, and density functional theory based calculations are performed to rationalize the chiral time-averaged appearance of the molecular rotors. While there are no attractive intermolecular interactions between the molecular species themselves, when mixed together there is a strong preference for the formation of 1:1 heteromolecular pairs. We demonstrate that STM tip-induced molecular manipulations can be used to assemble these complexes, examine the chirality of each species, and thereby interrogate if their interactions are enantioselective. A statistical analysis of this data reveals that intrinsically chiral propylene oxide preferentially binds one of the enantiomers of propene with a 3:2 ratio, thereby demonstrating that the surface chirality of small nonchiral molecules can be directed with a chiral modifier. As such, this investigation sheds light onto previously reported ensemble studies in which chirally seeded layers of molecules that are achiral in the gas phase can lead to an amplification of enantioselective adsorption.
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Affiliation(s)
- Amanda M Larson
- Department of Chemistry , Tufts University , Medford , Massachusetts 02155 , United States
| | - Kyle Groden
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering , Washington State University , Pullman , Washington 99164 , United States
| | - Ryan T Hannagan
- Department of Chemistry , Tufts University , Medford , Massachusetts 02155 , United States
| | - Jean-Sabin McEwen
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering , Washington State University , Pullman , Washington 99164 , United States
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
- Department of Physics , Washington State University , Pullman , Washington 99164 , United States
- Department of Biological Systems Engineering , Washington State University , Pullman , Washington 99164 , United States
- Institute of Integrated Catalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - E Charles H Sykes
- Department of Chemistry , Tufts University , Medford , Massachusetts 02155 , United States
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15
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Attia S, Spadafora EJ, Hartmann J, Freund HJ, Schauermann S. Molecular beam/infrared reflection-absorption spectroscopy apparatus for probing heterogeneously catalyzed reactions on functionalized and nanostructured model surfaces. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:053903. [PMID: 31153295 DOI: 10.1063/1.5093487] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 05/06/2019] [Indexed: 06/09/2023]
Abstract
A new custom-designed ultrahigh vacuum (UHV) apparatus combining molecular beam techniques and in situ surface spectroscopy for reactivity measurements on complex nanostructured model surfaces is described. It has been specifically designed to study the mechanisms, kinetics, and dynamics of heterogeneously catalyzed reactions over well-defined model catalysts consisting of metal nanoparticles supported on thin oxide films epitaxially grown on metal single crystals. The reactivity studies can be performed in a broad pressure range starting from UHV up to the ambient pressure conditions. The UHV system includes (i) a preparation chamber providing the experimental techniques required for the preparation and structural characterization of single-crystal based model catalysts such as oxide supported metal particles or ordered oxide surfaces and (ii) the reaction chamber containing three molecular beams-two effusive and one supersonic, which are crossed at the same point on the sample surface, infrared reflection-absorption spectroscopy for the detection of surface-adsorbed species, and quadrupole mass spectrometry for gas phase analysis. The supersonic beam is generated in a pulsed supersonic expansion and can be modulated via a variable duty-cycle chopper. The effusive beams are produced by newly developed compact differentially pumped sources based on multichannel glass capillary arrays. Both effusive sources can be modulated by a vacuum-motor driven chopper and are capable of providing high flux and high purity beams. The apparatus contains an ambient pressure cell, which is connected to the preparation chamber via an in situ sample transfer system and provides an experimental possibility to study the reactivity of well-defined nanostructured model catalysts in a broad range of pressure conditions-up to ambient pressure-with the gas phase analysis based on gas chromatography. Additionally, a dedicated deposition chamber is connected to the preparation chamber, which is employed for the in situ functionalization of model surfaces with large organic molecules serving as promoters or modifiers of chemical reactions. We present a general overview of the apparatus as well as a description of the individual components and their interplay. The results of the test measurements involving the most important components are presented and discussed.
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Affiliation(s)
- Smadar Attia
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Evan J Spadafora
- Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany
| | - Jens Hartmann
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Hans-Joachim Freund
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Swetlana Schauermann
- Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany
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16
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Meemken F, Rodríguez-García L. Revealing Catalytically Relevant Surface Species by Kinetic Isotope Effect Spectroscopy: H-Bonding to Ester Carbonyl of trans-Ethyl Pyruvate Controls Enantioselectivity on a Cinchona-Modified Pt Catalyst. J Phys Chem Lett 2018; 9:996-1001. [PMID: 29420894 DOI: 10.1021/acs.jpclett.7b03360] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Monitoring active surface species on an operating technical catalyst is a challenging task due to the presence of multiple different adsorption sites and the abundance of bulk species. In this work, kinetic isotope effect (KIE) spectroscopy is introduced to capture the signals of catalytically relevant hydrogenation species from the IR spectroscopic detection in attenuated total reflection mode. The catalytic interface formed between a cinchona-modified Pt/Al2O3 catalyst and the solvent toluene is sensitively probed directly at the rate limiting step(s) during the asymmetric hydrogenation of ethyl pyruvate by measuring the effects of substituting H2 by D2 kinetically and spectroscopically in the same operando experiment. The application of KIE spectroscopy provides unprecedented molecular level insight into the structure of the diastereomeric intermediate surface complex and the phenomenon rate enhancement, which revolutionizes our understanding of chirally modified metal catalysts.
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Affiliation(s)
- Fabian Meemken
- Department of Chemistry and Applied Biosciences, Institute of Chemical and Biomolecular Engineering , ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
| | - Laura Rodríguez-García
- Department of Chemistry and Applied Biosciences, Institute of Chemical and Biomolecular Engineering , ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
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17
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Abstract
In the present review we survey the main advances made in recent years on the understanding of chemical chirality at solid surfaces. Chirality is an important topic, made particularly relevant by the homochiral nature of the biochemistry of life on Earth, and many chiral chemical reactions involve solid surfaces. Here we start our discussion with a description of surface chirality and of the different ways that chirality can be bestowed on solid surfaces. We then expand on the studies carried out to date to understand the adsorption of chiral compounds at a molecular level. We summarize the work published on the adsorption of pure enantiomers, of enantiomeric mixtures, and of prochiral molecules on chiral and achiral model surfaces, especially on well-defined metal single crystals but also on other flat substrates such as highly ordered pyrolytic graphite. Several phenomena are identified, including surface reconstruction and chiral imprinting upon adsorption of chiral agents, and the enhancement or suppression of enantioselectivity seen in some cases upon adsorption of enantiomixtures of chiral compounds. The possibility of enhancing the enantiopurity of adsorbed layers upon the addition of chiral seeds and the so-called "sergeants and soldiers" phenomenon are presented. Examples are provided where the chiral behavior has been associated with either thermodynamic or kinetic driving forces. Two main approaches to the creation of enantioselective surface sites are discussed, namely, via the formation of supramolecular chiral ensembles made out of small chiral adsorbates, and by adsorption of more complex chiral molecules capable of providing suitable chiral environments for reactants by themselves, via the formation of individual adsorbate:modifier adducts on the surface. Finally, a discussion is offered on the additional effects generated by the presence of the liquid phase often required in practical applications such as enantioselective crystallization, chiral chromatography, and enantioselective catalysis.
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, CA 92521, USA.
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18
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Meemken F, Baiker A. Recent Progress in Heterogeneous Asymmetric Hydrogenation of C═O and C═C Bonds on Supported Noble Metal Catalysts. Chem Rev 2017; 117:11522-11569. [DOI: 10.1021/acs.chemrev.7b00272] [Citation(s) in RCA: 198] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fabian Meemken
- Institute for Chemical and
Biochemical Engineering, Department of Chemistry and Applied Biosciences, ETH-Zurich, Hönggerberg, HCI, Vladimir Prelog Weg 1, CH-8093 Zurich, Switzerland
| | - Alfons Baiker
- Institute for Chemical and
Biochemical Engineering, Department of Chemistry and Applied Biosciences, ETH-Zurich, Hönggerberg, HCI, Vladimir Prelog Weg 1, CH-8093 Zurich, Switzerland
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19
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Jethwa SJ, Kolsbjerg EL, Vadapoo SR, Cramer JL, Lammich L, Gothelf KV, Hammer B, Linderoth TR. Supramolecular Corrals on Surfaces Resulting from Aromatic Interactions of Nonplanar Triazoles. ACS NANO 2017; 11:8302-8310. [PMID: 28762721 DOI: 10.1021/acsnano.7b03484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Interaction forces between aromatic moieties, often referred to as π-π interactions, are an important element in stabilizing complex supramolecular structures. For supramolecular self-assembly occurring on surfaces, where aromatic moieties are typically forced to adsorb coplanar with the surface, the possible role of intermolecular aromatic interactions is much less explored. Here, we report on unusual, ring-shaped supramolecular corral surface structures resulting from adsorption of a molecule with nonplanar structure, allowing for intermolecular aromatic interactions. The discrete corral structures are observed using high-resolution scanning tunneling microscopy, and the energetic driving forces for their formation are elucidated using density functional theory calculations and Monte Carlo simulations. The individual corrals involve between 11 and 18 molecules bound through triazole moieties to a ring-shaped ensemble of bridge site positions on (111) surfaces of copper, silver, or gold. The curvature required to form the corrals is identified to result from the angle dependence of aromatic interactions between molecular phenanthrene moieties. The study provides detailed quantitative insights into triazole-surface and aromatic interactions and illustrates how they may be used to drive surface supramolecular self-assembly.
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Affiliation(s)
- Siddharth J Jethwa
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
| | - Esben L Kolsbjerg
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
| | - Sundar R Vadapoo
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
| | - Jacob L Cramer
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
| | - Lutz Lammich
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
| | - Kurt V Gothelf
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
| | - Bjørk Hammer
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
| | - Trolle R Linderoth
- Department of Physics and Astronomy and ‡Department of Chemistry, Interdisciplinary Nanoscience Center (iNANO), Aarhus University , 8000 Aarhus, Denmark
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20
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry and
UCR Center for Catalysis, University of California, Riverside, California 92521, United States
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21
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Ni Y, Gordon AD, Tanicala F, Zaera F. Correlation between Chiral Modifier Adsorption and Enantioselectivity in Hydrogenation Catalysis. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yufei Ni
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
| | - Alexander D. Gordon
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
| | - Florisa Tanicala
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
| | - Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
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22
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Ni Y, Gordon AD, Tanicala F, Zaera F. Correlation between Chiral Modifier Adsorption and Enantioselectivity in Hydrogenation Catalysis. Angew Chem Int Ed Engl 2017; 56:7963-7966. [DOI: 10.1002/anie.201704880] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Yufei Ni
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
| | - Alexander D. Gordon
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
| | - Florisa Tanicala
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
| | - Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis University of California Riverside CA 92521 USA
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23
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Tysoe WT. Giving catalysts a hand. Nat Chem 2017; 9:503-504. [DOI: 10.1038/nchem.2762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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24
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Dong Y, Goubert G, Groves MN, Lemay JC, Hammer B, McBreen PH. Structure and Dynamics of Individual Diastereomeric Complexes on Platinum: Surface Studies Related to Heterogeneous Enantioselective Catalysis. Acc Chem Res 2017; 50:1163-1170. [PMID: 28418642 DOI: 10.1021/acs.accounts.6b00516] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The modification of heterogeneous catalysts through the chemisorption of chiral molecules is a method to create catalytic sites for enantioselective surface reactions. The chiral molecule is called a chiral modifier by analogy to the terms chiral auxiliary or chiral ligand used in homogeneous asymmetric catalysis. While there has been progress in understanding how chirality transfer occurs, the intrinsic difficulties in determining enantioselective reaction mechanisms are compounded by the multisite nature of heterogeneous catalysts and by the challenges facing stereospecific surface analysis. However, molecular descriptions have now emerged that are sufficiently detailed to herald rapid advances in the area. The driving force for the development of heterogeneous enantioselective catalysts stems, at the minimum, from the practical advantages they might offer over their homogeneous counterparts in terms of process scalability and catalyst reusability. The broader rewards from their study lie in the insights gained on factors controlling selectivity in heterogeneous catalysis. Reactions on surfaces to produce a desired enantiomer in high excess are particularly challenging since at room temperature, barrier differences as low as ∼2 kcal/mol between pathways to R and S products are sufficient to yield an enantiomeric ratio (er) of 90:10. Such small energy differences are comparable to weak interadsorbate interaction energies and are much smaller than chemisorption or even most physisorption energies. In this Account, we describe combined experimental and theoretical surface studies of individual diastereomeric complexes formed between chiral modifiers and prochiral reactants on the Pt(111) surface. Our work is inspired by the catalysis literature on the enantioselective hydrogenation of activated ketones on cinchona-modified Pt catalysts. Using scanning tunneling microscopy (STM) measurements and density functional theory (DFT) calculations, we probe the structures and relative abundances of non-covalently bonded complexes formed between three representative prochiral molecules and (R)-(+)-1-(1-naphthyl)ethylamine ((R)-NEA). All three prochiral molecules, 2,2,2-trifluoroacetophenone (TFAP), ketopantolactone (KPL), and methyl 3,3,3-trifluoropyruvate (MTFP), are found to form multiple complexation configurations around the ethylamine group of chemisorbed (R)-NEA. The principal intermolecular interaction is NH···O H-bonding. In each case, submolecularly resolved STM images permit the determination of the prochiral ratio (pr), pro-R to pro-S, proper to specific locations around the ethylamine group. The overall pr observed in experiments on large ensembles of KPL-(R)-NEA complexes is close to the er reported in the literature for the hydrogenation of KPL to pantolactone on (R)-NEA-modified Pt catalysts at 1 bar H2. The results of independent DFT and STM studies are merged to determine the geometries of the most abundant complexation configurations. The structures reveal the hierarchy of chemisorption and sometimes multiple H-bonding interactions operating in complexes. In particular, privileged complexes formed by KPL and MTFP reveal the participation of secondary CH···O interactions in stereocontrol. State-specific STM measurements on individual TFAP-(R)-NEA complexes show that complexation states interconvert through processes including prochiral inversion. The state-specific information on structure, prochirality, dynamics, and energy barriers delivered by the combination of DFT and STM provides insight on how to design better chiral modifiers.
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Affiliation(s)
- Yi Dong
- Department of Chemistry and FQRNT Centre in Green Chemistry and Catalysis, Laval University, Quebec City, Quebec G1V 0A6, Canada
| | - Guillaume Goubert
- Department of Chemistry and FQRNT Centre in Green Chemistry and Catalysis, Laval University, Quebec City, Quebec G1V 0A6, Canada
| | - Michael N. Groves
- Department
of Chemistry and Biochemistry, California State University, Fullerton, Fullerton, California 92834, United States
- iNano
and Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - Jean-Christian Lemay
- Department of Chemistry and FQRNT Centre in Green Chemistry and Catalysis, Laval University, Quebec City, Quebec G1V 0A6, Canada
| | - Bjørk Hammer
- iNano
and Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - Peter H. McBreen
- Department of Chemistry and FQRNT Centre in Green Chemistry and Catalysis, Laval University, Quebec City, Quebec G1V 0A6, Canada
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25
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Rodríguez-García L, Hungerbühler K, Baiker A, Meemken F. The Critical Role of Tilted Cinchona Surface Species for Enantioselective Hydrogenation. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00324] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laura Rodríguez-García
- Institute for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg,
HCI, CH-8093 Zürich, Switzerland
| | - Konrad Hungerbühler
- Institute for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg,
HCI, CH-8093 Zürich, Switzerland
| | - Alfons Baiker
- Institute for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg,
HCI, CH-8093 Zürich, Switzerland
| | - Fabian Meemken
- Institute for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg,
HCI, CH-8093 Zürich, Switzerland
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26
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Monitoring interconversion between stereochemical states in single chirality-transfer complexes on a platinum surface. Nat Chem 2017; 9:531-536. [DOI: 10.1038/nchem.2753] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 02/21/2017] [Indexed: 01/19/2023]
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27
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Dong Y, Svane K, Lemay JC, Groves MN, McBreen PH. STM Study of Ketopantolactone/(R)-1-(1-Naphthyl)ethylamine Complexes on Pt(111): Comparison of Prochiral and Enantiomeric Ratios and Examination of the Contribution of CH···OC Bonding. ACS Catal 2017. [DOI: 10.1021/acscatal.6b02590] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yi Dong
- Department of Chemistry, Laval University, Quebec City, Quebec G1V 0A6, Canada
| | - Katrine Svane
- Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
| | | | - Michael N. Groves
- Department of Chemistry and Biochemistry, California State University, Fullerton, Fullerton, California 92834, United States
| | - Peter H. McBreen
- Department of Chemistry, Laval University, Quebec City, Quebec G1V 0A6, Canada
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28
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Darling GR, Forster M, Lin C, Liu N, Raval R, Hodgson A. Chiral segregation driven by a dynamical response of the adsorption footprint to the local adsorption environment: bitartrate on Cu(110). Phys Chem Chem Phys 2017; 19:7617-7623. [DOI: 10.1039/c7cp00622e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Bitartrate, a strongly bound chiral modifier, is able to restructure its adsorption footprint on Cu(110) in response to local adsorbates.
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Affiliation(s)
- G. R. Darling
- Surface Science Research Centre and Department of Chemistry
- University of Liverpool
- Liverpool L69 3BX
- UK
| | - M. Forster
- Surface Science Research Centre and Department of Chemistry
- University of Liverpool
- Liverpool L69 3BX
- UK
| | - C. Lin
- Surface Science Research Centre and Department of Chemistry
- University of Liverpool
- Liverpool L69 3BX
- UK
| | - N. Liu
- Surface Science Research Centre and Department of Chemistry
- University of Liverpool
- Liverpool L69 3BX
- UK
| | - R. Raval
- Surface Science Research Centre and Department of Chemistry
- University of Liverpool
- Liverpool L69 3BX
- UK
| | - A. Hodgson
- Surface Science Research Centre and Department of Chemistry
- University of Liverpool
- Liverpool L69 3BX
- UK
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29
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Mahapatra M, Burkholder L, Garvey M, Bai Y, Saldin DK, Tysoe WT. Enhanced hydrogenation activity and diastereomeric interactions of methyl pyruvate co-adsorbed with R-1-(1-naphthyl)ethylamine on Pd(111). Nat Commun 2016; 7:12380. [PMID: 27488075 PMCID: PMC4976220 DOI: 10.1038/ncomms12380] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 06/28/2016] [Indexed: 11/30/2022] Open
Abstract
Unmodified racemic sites on heterogeneous chiral catalysts reduce their overall enantioselectivity, but this effect is mitigated in the Orito reaction (methyl pyruvate (MP) hydrogenation to methyl lactate) by an increased hydrogenation reactivity. Here, this effect is explored on a R-1-(1-naphthyl)ethylamine (NEA)-modified Pd(111) model catalyst where temperature-programmed desorption experiments reveal that NEA accelerates the rates of both MP hydrogenation and H/D exchange. NEA+MP docking complexes are imaged using scanning tunnelling microscopy supplemented by density functional theory calculations to allow the most stable docking complexes to be identified. The results show that diastereomeric interactions between NEA and MP occur predominantly by binding of the C=C of the enol tautomer of MP to the surface, while simultaneously optimizing C=O····H2N hydrogen-bonding interactions. The combination of chiral-NEA driven diastereomeric docking with a tautomeric preference enhances the hydrogenation activity since C=C bonds hydrogenate more easily than C=O bonds thus providing a rationale for the catalytic observations. Achiral sites on a catalyst can result in formation of racemic product, though this can be avoided where the chiral sites lead to enhanced reaction rates. Here, the authors report that for the hydrogenation of methyl pyruvate the chiral modifier enhances the hydrogenation reactivity by favouring the more reactive enol tautomer.
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Affiliation(s)
- Mausumi Mahapatra
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
| | - Luke Burkholder
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
| | - Michael Garvey
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA.,Applied Research Institute, University of Illinois at Urbana-Champaign, Champaign, Illinois 61820, USA
| | - Yun Bai
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
| | - Dilano K Saldin
- Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
| | - Wilfred T Tysoe
- Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
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30
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Abstract
A novel process is developed to prepare highly efficient single site Pt(111) hexagonal nanocrystals on a carbon support for the asymmetric hydrogenation of α-ketoesters.
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Affiliation(s)
- Poonam Sharma
- Department of Chemistry
- Indian Institute of Technology Jodhpur
- India
| | - Rakesh K. Sharma
- Department of Chemistry
- Indian Institute of Technology Jodhpur
- India
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31
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Forster M, Raval R. Simple rules and the emergence of complexity in surface chirality. Chem Commun (Camb) 2016; 52:14075-14084. [DOI: 10.1039/c6cc06523f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Surface chirality arising from self-organized molecular monolayers may manifest both a handedness and footedness, leading to a dual level of chiral expression.
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Affiliation(s)
- M. Forster
- Surface Science Research Centre
- Department of Chemistry
- University of Liverpool
- Liverpool
- UK
| | - R. Raval
- Surface Science Research Centre
- Department of Chemistry
- University of Liverpool
- Liverpool
- UK
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32
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Rodríguez-García L, Hungerbühler K, Baiker A, Meemken F. Enantioselection on Heterogeneous Noble Metal Catalyst: Proline-Induced Asymmetry in the Hydrogenation of Isophorone on Pd Catalyst. J Am Chem Soc 2015; 137:12121-30. [DOI: 10.1021/jacs.5b07904] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Laura Rodríguez-García
- Institute
for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg, HCI, CH-8093 Zürich, Switzerland
| | - Konrad Hungerbühler
- Institute
for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg, HCI, CH-8093 Zürich, Switzerland
| | - Alfons Baiker
- Institute
for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg, HCI, CH-8093 Zürich, Switzerland
| | - Fabian Meemken
- Institute
for Chemical and
Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Hönggerberg, HCI, CH-8093 Zürich, Switzerland
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33
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Kaushik M, Basu K, Benoit C, Cirtiu CM, Vali H, Moores A. Cellulose Nanocrystals as Chiral Inducers: Enantioselective Catalysis and Transmission Electron Microscopy 3D Characterization. J Am Chem Soc 2015; 137:6124-7. [PMID: 25915443 DOI: 10.1021/jacs.5b02034] [Citation(s) in RCA: 136] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Cellulose nanocrystals (CNCs), derived from cellulose, provide us with an opportunity to devise more sustainable solutions to current technological challenges. Enantioselective catalysis, especially heterogeneous, is the preferred method for the synthesis of pure chiral molecules in the fine chemical industries. Cellulose has been long sought as a chiral inducer in enantioselective catalysis. We report herein an unprecedentedly high enantiomeric excess (ee) for Pd patches deposited onto CNCs used as catalysts for the hydrogenation of prochiral ketones in water at room temperature and 4 bar H2. Our system, where CNCs acted as support and sole chiral source, achieved an ee of 65% with 100% conversions. Cryo-electron microscopy, high-resolution transmission electron microscopy, and tomography were used for the first time to study the 3D structure of a metal functionalized CNC hybrid. It established the presence of sub-nanometer-thick Pd patches at the surface of CNCs and provided insight into the chiral induction mechanism.
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Affiliation(s)
- Madhu Kaushik
- †Centre for Green Chemistry and Catalysis, Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
| | - Kaustuv Basu
- ‡Facility for Electron Microscopy Research, McGill University, 3640 University Street, Montréal, QC H3A 0C7, Canada
| | - Charles Benoit
- †Centre for Green Chemistry and Catalysis, Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
| | - Ciprian M Cirtiu
- †Centre for Green Chemistry and Catalysis, Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada.,∥Direction santé environnement et toxicologie, Institut National de Santé Publique du Québec, 945, avenue Wolfe, 4e étage Sainte-Foy, Quebec, QC G1V 5B3, Canada
| | - Hojatollah Vali
- ‡Facility for Electron Microscopy Research, McGill University, 3640 University Street, Montréal, QC H3A 0C7, Canada.,§Anatomy and Cell Biology, McGill University, 3640 University Street, Montréal, QC H3A 0C7, Canada
| | - Audrey Moores
- †Centre for Green Chemistry and Catalysis, Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
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34
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Hong J, Lee I, Zaera F. Correlated bifunctionality in heterogeneous catalysts: selective tethering of cinchonidine next to supported Pt nanoparticles. Catal Sci Technol 2015. [DOI: 10.1039/c4cy00844h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A strategy has been devised to add molecular functionality to heterogeneous catalysts in a spatially correlated fashion.
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Affiliation(s)
- Junghyun Hong
- Department of Chemistry
- University of California
- Riverside
- USA
| | - Ilkeun Lee
- Department of Chemistry
- University of California
- Riverside
- USA
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35
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Dementyev P, Peter M, Adamovsky S, Schauermann S. Chirally-modified metal surfaces: energetics of interaction with chiral molecules. Phys Chem Chem Phys 2015; 17:22726-35. [DOI: 10.1039/c5cp03627e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Imparting chirality to non-chiral metal surfaces by adsorption of chiral modifiers is a highly promising route to create effective heterogeneously catalyzed processes for the production of enantiopure pharmaceuticals.
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Affiliation(s)
| | | | | | - Swetlana Schauermann
- Fritz-Haber-Institut der Max-Planck-Gesellschaft
- Germany
- Institut of Physical Chemistry
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
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36
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Svane K, Dong Y, Groves MN, Demers-Carpentier V, Lemay JC, Ouellet M, Hammer B, McBreen PH. Single-chiral-catalytic-surface-sites: STM and DFT study of stereodirecting complexes formed between (R)-1-(1-naphthyl)ethylamine and ketopantolactone on Pt(111). Catal Sci Technol 2015. [DOI: 10.1039/c4cy01044b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Revealing the set of most stable bimolecular complexes formed by a prochiral molecule and a chiral modifier on Pt(111).
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Affiliation(s)
- Katrine Svane
- iNano and Department of Physics and Astronomy
- Aarhus University
- 8000 Aarhus C
- Denmark
| | - Yi Dong
- Department of Chemistry
- Laval University
- Quebec City
- Canada
| | - Michael N. Groves
- iNano and Department of Physics and Astronomy
- Aarhus University
- 8000 Aarhus C
- Denmark
| | | | | | | | - Bjørk Hammer
- iNano and Department of Physics and Astronomy
- Aarhus University
- 8000 Aarhus C
- Denmark
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37
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Meemken F, Steiger T, Holland MC, Gilmour R, Hungerbühler K, Baiker A. Adsorption and stability of chiral modifiers based on 1-(1-naphthyl)-ethylamine for Pt catalysed heterogeneous asymmetric hydrogenations. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01136h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic and in situ ATR-IR spectroscopic investigations provide mechanistic insight relevant to heterogeneous asymmetric hydrogenation on Pt catalyst using naphthylethylamine-based modifiers.
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Affiliation(s)
- Fabian Meemken
- ETH Zürich
- Department of Chemistry and Applied Biosciences
- Institute for Chemical and Bioengineering
- Hönggerberg
- HCI
| | - Titian Steiger
- ETH Zürich
- Department of Chemistry and Applied Biosciences
- Institute for Chemical and Bioengineering
- Hönggerberg
- HCI
| | - Mareike C. Holland
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Ryan Gilmour
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Konrad Hungerbühler
- ETH Zürich
- Department of Chemistry and Applied Biosciences
- Institute for Chemical and Bioengineering
- Hönggerberg
- HCI
| | - Alfons Baiker
- ETH Zürich
- Department of Chemistry and Applied Biosciences
- Institute for Chemical and Bioengineering
- Hönggerberg
- HCI
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38
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39
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MacLean MWA, Reid LM, Wu X, Crudden CM. Chirality in Ordered Porous Organosilica Hybrid Materials. Chem Asian J 2014; 10:70-82. [DOI: 10.1002/asia.201402682] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Indexed: 11/10/2022]
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40
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Meemken F, Hungerbühler K, Baiker A. Monitoring Surface Processes During Heterogeneous Asymmetric Hydrogenation of Ketones on a Chirally Modified Platinum Catalyst by Operando Spectroscopy. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402981] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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41
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Sonnenberg JF, Morris RH. Distinguishing homogeneous from nanoparticle asymmetric iron catalysis. Catal Sci Technol 2014. [DOI: 10.1039/c4cy00468j] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Meemken F, Hungerbühler K, Baiker A. Monitoring Surface Processes During Heterogeneous Asymmetric Hydrogenation of Ketones on a Chirally Modified Platinum Catalyst by Operando Spectroscopy. Angew Chem Int Ed Engl 2014; 53:8640-4. [DOI: 10.1002/anie.201402981] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Revised: 03/26/2014] [Indexed: 11/06/2022]
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43
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Rasmussen AMH, Groves MN, Hammer B. Remote Activation of Chemical Bonds in Heterogeneous Catalysis. ACS Catal 2014. [DOI: 10.1021/cs400875k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Anton M. H. Rasmussen
- iNANO and Department of Physics
and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - Michael N. Groves
- iNANO and Department of Physics
and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
| | - Bjørk Hammer
- iNANO and Department of Physics
and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
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44
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Goubert G, McBreen PH. Surface Diastereomeric Complexes Formed by Methyl Benzoylformate and (R)-1-(1-Naphthyl)ethylamine on Pt(111). ACS Catal 2014. [DOI: 10.1021/cs400846j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guillaume Goubert
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université Laval, Québec G1V 0A6, Canada
| | - Peter H. McBreen
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université Laval, Québec G1V 0A6, Canada
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45
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Kjeldsen ND, Funder ED, Gothelf KV. Synthesis of homochiral tris-indanyl molecular rods. Org Biomol Chem 2014; 12:3679-85. [DOI: 10.1039/c4ob00011k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By Ti-mediated alkyne trimerization and subsequent Sonogashira and Ohira–Bestman reactions, homochiral molecular rod molecules were prepared for surface self-assembly studies.
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Affiliation(s)
- Niels Due Kjeldsen
- Aarhus University
- iNANO and Department of Chemistry
- Gustav Wieds Vej 14, Denmark
| | - Erik Daa Funder
- Aarhus University
- iNANO and Department of Chemistry
- Gustav Wieds Vej 14, Denmark
| | - Kurt V. Gothelf
- Aarhus University
- iNANO and Department of Chemistry
- Gustav Wieds Vej 14, Denmark
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46
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Guo Z, De Cat I, Van Averbeke B, Lin J, Wang G, Xu H, Lazzaroni R, Beljonne D, Schenning APHJ, De Feyter S. Affecting surface chirality via multicomponent adsorption of chiral and achiral molecules. Chem Commun (Camb) 2014; 50:11903-6. [DOI: 10.1039/c4cc04393f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Here we report on the apparent reduction in surface chirality upon co-assembling a chiral and achiral molecule into a physisorbed self-assembled monolayer at the liquid/solid interface as revealed by scanning tunneling microscopy (STM).
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Affiliation(s)
- Zongxia Guo
- Division of Molecular Imaging and Photonics
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
- CAS Key Laboratory of Bio-based Materials
| | - Inge De Cat
- Division of Molecular Imaging and Photonics
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
| | | | - Jianbin Lin
- Laboratory of Macromolecular and Organic Chemistry
- Eindhoven University of Technology
- 5600 MB Eindhoven, The Netherlands
| | - Guojie Wang
- Division of Molecular Imaging and Photonics
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
| | - Hong Xu
- Division of Molecular Imaging and Photonics
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
| | - Roberto Lazzaroni
- Service de Chimie des Matériaux Nouveaux
- Université de Mons
- 7000 Mons, Belgium
| | - David Beljonne
- Service de Chimie des Matériaux Nouveaux
- Université de Mons
- 7000 Mons, Belgium
| | - Albertus P. H. J. Schenning
- Laboratory of Macromolecular and Organic Chemistry
- Eindhoven University of Technology
- 5600 MB Eindhoven, The Netherlands
| | - Steven De Feyter
- Division of Molecular Imaging and Photonics
- Department of Chemistry
- KU Leuven
- B-3001 Leuven, Belgium
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47
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Meemken F, Baiker A, Schenker S, Hungerbühler K. Chiral Modification of Platinum by Co-Adsorbed Cinchonidine and Trifluoroacetic Acid: Origin of Enhanced Stereocontrol in the Hydrogenation of Trifluoroacetophenone. Chemistry 2013; 20:1298-309. [DOI: 10.1002/chem.201303261] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Indexed: 11/08/2022]
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48
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Goubert G, Demers-Carpentier V, Loach RP, Lafleur-Lambert R, Lemay JC, Boukouvalas J, McBreen PH. Aminolactone Chiral Modifiers for Heterogeneous Asymmetric Hydrogenation: Corrected Structure of Pantoyl-Naphthylethylamine, In-Situ Hydrogenolysis, and Scanning Tunneling Microscopy Observation of Supramolecular Aminolactone/Substrate Assemblies on Pt(111). ACS Catal 2013. [DOI: 10.1021/cs4007588] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Guillaume Goubert
- Department of Chemistry and C3V, Université Laval, Québec, Canada G1V 0A6
| | | | - Richard P. Loach
- Department of Chemistry and C3V, Université Laval, Québec, Canada G1V 0A6
| | | | | | - John Boukouvalas
- Department of Chemistry and C3V, Université Laval, Québec, Canada G1V 0A6
| | - Peter H. McBreen
- Department of Chemistry and C3V, Université Laval, Québec, Canada G1V 0A6
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49
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Demers-Carpentier V, Rasmussen AMH, Goubert G, Ferrighi L, Dong Y, Lemay JC, Masini F, Zeng Y, Hammer B, McBreen PH. Stereodirection of an α-Ketoester at Sub-molecular Sites on Chirally Modified Pt(111): Heterogeneous Asymmetric Catalysis. J Am Chem Soc 2013; 135:9999-10002. [DOI: 10.1021/ja403955k] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Anton M. H. Rasmussen
- Interdisciplinary Nanoscience
Center (iNano) and Department of Physics and Astronomy, Aarhus University, DK 8000 Aarhus, Denmark
| | - Guillaume Goubert
- C3V and Department of Chemistry, Laval University, Québec, Canada G1V 0A6
| | - Lara Ferrighi
- Interdisciplinary Nanoscience
Center (iNano) and Department of Physics and Astronomy, Aarhus University, DK 8000 Aarhus, Denmark
| | - Yi Dong
- C3V and Department of Chemistry, Laval University, Québec, Canada G1V 0A6
| | | | - Federico Masini
- C3V and Department of Chemistry, Laval University, Québec, Canada G1V 0A6
| | - Yang Zeng
- C3V and Department of Chemistry, Laval University, Québec, Canada G1V 0A6
| | - Bjørk Hammer
- Interdisciplinary Nanoscience
Center (iNano) and Department of Physics and Astronomy, Aarhus University, DK 8000 Aarhus, Denmark
| | - Peter H. McBreen
- C3V and Department of Chemistry, Laval University, Québec, Canada G1V 0A6
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50
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Gordon AD, Zaera F. Adsorption of 1-(1-Naphthyl)ethylamine from Solution onto Platinum Surfaces: Implications for the Chiral Modification of Heterogeneous Catalysts. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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