1
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Ajioka H, Komada M, Yao H. Mixed-ligand strategy for synthesizing water-soluble chiral gold clusters with phosphine ligands. Phys Chem Chem Phys 2022; 24:29223-29231. [PMID: 36445264 DOI: 10.1039/d2cp04021b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Water-soluble chiral metal clusters have drawn much attention by virtue of their fascinating physicochemical properties and potential biomedical applications, but currently, phosphine-protected Au clusters with both chirality and water-solubility are still very limited. In this article, we demonstrate a mixed-ligand strategy for the facile synthesis of atomically precise, water-soluble chiral Au clusters protected by phosphine alone. The clusters are obtained by the reduction of aurate ions in the presence of a phosphine mixture consisting of highly hydrophilic monophosphine (i.e., triphenylphosphine trisulfonate; TPPTS) and hydrophobic chiral diphosphine (i.e., S-Segphos or S-BINAP), both of which are commercially available. The clusters are size/composition-separated via gel electrophoresis, and notably, heptanuclear cluster Au7(S-Segphos)3(TPPTS)2 exhibits a large chiroptical activity with the maximum anisotropy factor (g-factor) of 4.7 × 10-3, one of the largest values in such Au clusters. Quantum chemical calculations for model Au7 cluster species suggest two important factors to obtain large chiroptical activity: (i) more than two axially-chiral diphosphine ligands, and (ii) the absence of configurational isomer averaging. Consequently, despite the experimental use of a mixture containing both chiral and achiral phosphines, a large chiroptical activity can be created in Au clusters with high water-solubility.
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Affiliation(s)
- Hiyori Ajioka
- Division of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan.
| | - Mayuko Komada
- Division of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan.
| | - Hiroshi Yao
- Division of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan.
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2
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3
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Man RWY, Yi H, Malola S, Takano S, Tsukuda T, Häkkinen H, Nambo M, Crudden CM. Synthesis and Characterization of Enantiopure Chiral Bis NHC-Stabilized Edge-Shared Au 10 Nanocluster with Unique Prolate Shape. J Am Chem Soc 2022; 144:2056-2061. [PMID: 35100506 DOI: 10.1021/jacs.1c11857] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Herein we report the first chiral Au10 nanoclusters stabilized by chiral bis N-heterocyclic carbene (bisNHC) ligands. ESI-MS and single-crystal X-ray crystallography confirmed the molecular formula to be [Au10(bisNHC)4Br2](O2CCF3)2. The chiral Au10 nanocluster adopts a linear edge-shared tetrahedral geometry with a prolate shape. DFT calculations provide insight into the electronic structure, optical absorption, and circular dichroism (CD) characteristics of this unique Au10 nanocluster. CD spectra demonstrate chirality transfer from the chiral bisNHC ligand to the inner Au10 nanocluster core. Examination of ESI-MS and UV-vis spectra show that cluster [Au9(bisNHC)4Br]Br2 is formed initially and then transformed into the Au10 nanocluster in solution.
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Affiliation(s)
- Renee W Y Man
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Furo, Chikusa, Nagoya 464-8602, Japan
| | - Hong Yi
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Furo, Chikusa, Nagoya 464-8602, Japan
| | - Sami Malola
- Departments of Chemistry and Physics, Nanoscience Center, University of Jyväskylä, 40014 Jyväskylä, Finland
| | - Shinjiro Takano
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tatsuya Tsukuda
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hannu Häkkinen
- Departments of Chemistry and Physics, Nanoscience Center, University of Jyväskylä, 40014 Jyväskylä, Finland
| | - Masakazu Nambo
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Furo, Chikusa, Nagoya 464-8602, Japan
| | - Cathleen M Crudden
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Furo, Chikusa, Nagoya 464-8602, Japan.,Department of Chemistry, Queen's University, Chernoff Hall, Kingston, Ontario K7L 3N6, Canada
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4
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Michelet V. Gold-Catalyzed Reactions Towards Diversity: From Simple Substrates to Functionalized Carbo- and Heterocycles. CHEM REC 2021; 21:3884-3896. [PMID: 34747571 DOI: 10.1002/tcr.202100253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 10/23/2021] [Indexed: 12/29/2022]
Abstract
The field of gold catalysis has been in constant expansion during the last twenty years. Based on the precept of π-activation of unsaturated simple substrates, several new rearrangements have been discovered, implying aryl, alkyne, alkene or keto derivatives as key partners. In this personal account, the main contributions in the field of gold catalysis from our group will be highlighted, emphasizing the recent reports, starting from 1,6- and 1,5-enynes and then moving to keto-ynes derivatives. The gold-catalyzed reactions will be presented starting from classical skeletal rearrangements (cycloisomerization) and then domino processes. In each part, the presentation of asymmetric versions will be highlighted.
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Affiliation(s)
- Véronique Michelet
- Côte d'Azur University, Institut de Chimie de Nice, UMR 7272 CNRS, Valrose Park, Faculty of Sciences, 06108, Nice Cedex 2, France
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5
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Si WD, Li YZ, Zhang SS, Wang S, Feng L, Gao ZY, Tung CH, Sun D. Toward Controlled Syntheses of Diphosphine-Protected Homochiral Gold Nanoclusters through Precursor Engineering. ACS NANO 2021; 15:16019-16029. [PMID: 34592104 DOI: 10.1021/acsnano.1c04421] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Controllable syntheses of Au nanoclusters (NCs) with different nuclearities are of great significance due to the kernel-dependent physicochemical properties. Herein, two pairs of enantiomeric Au NCs [Au19(R/S-BINAP)4(PhC≡C)Cl4] (SD/Au19) and [Au11(R/S-BINAP)4(PhC≡C)2]·Cl (SD/Au11), both with atropos (rigid axial chirality) diphosphine BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthalene) as the predominant organic ligands, were controllably synthesized through precursor engineering. The former was obtained by direct reduction of HAuCl4·4H2O, while the latter was obtained by reduction of [Au(SMe2)Cl] instead. Intriguingly, the kernel of SD/Au19 contains an Au7 pentagonal bipyramid capped by two boat-like Au6 rings, which represents another type of Au19 kernel, making SD/Au19 a good candidate for comparative study with other Au19 NCs to get more insight into the distinct structural evolution of phosphine-protected Au NCs. Despite the previous chiroptical studies on some other chiral undecagold NCs, the successful attainment of the X-ray crystal structures for SD/Au11 not only provides a step forward toward better correlating the chiroptical activities with their structural details but also reveals that even the auxiliary protecting ligands also play a nontrivial role in tuning the geometrical structures of the metal NCs. The chiroptical activities of both SD/Au19 and SD/Au11 were found to originate from the chiral ligands and core distortions; the extended π-electron systems in the BINAP ligands have proved to positively contribute to the electronic absorptions and thus disturb the corresponding circular dichroism (CD) responses.
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Affiliation(s)
- Wei-Dan Si
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, People's Republic of China
| | - Ying-Zhou Li
- Shandong Provincial Key Laboratory of Molecular Engineering, Qilu University of Technology (Shandong Academy of Science), Ji'nan 250353, People's Republic of China
| | - Shan-Shan Zhang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, People's Republic of China
| | - Suna Wang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, and School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, People's Republic of China
| | - Lei Feng
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, People's Republic of China
| | - Zhi-Yong Gao
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, People's Republic of China
| | - Di Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan 250100, People's Republic of China
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6
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Shinjo N, Takano S, Tsukuda T. Effects of
π‐Electron
Systems on Optical Activity of Au
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Clusters Protected by Chiral Diphosphines. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12363] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Naoaki Shinjo
- Department of Chemistry Graduate School of Science, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku Tokyo 113‐0033 Japan
| | - Shinjiro Takano
- Department of Chemistry Graduate School of Science, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku Tokyo 113‐0033 Japan
| | - Tatsuya Tsukuda
- Department of Chemistry Graduate School of Science, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku Tokyo 113‐0033 Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University, Katsura Kyoto 615‐8520 Japan
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7
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Yi H, Osten KM, Levchenko TI, Veinot AJ, Aramaki Y, Ooi T, Nambo M, Crudden CM. Synthesis and enantioseparation of chiral Au 13 nanoclusters protected by bis- N-heterocyclic carbene ligands. Chem Sci 2021; 12:10436-10440. [PMID: 34447535 PMCID: PMC8356741 DOI: 10.1039/d1sc03076k] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 06/27/2021] [Indexed: 12/18/2022] Open
Abstract
A series of chiral Au13 nanoclusters were synthesized via the direct reduction of achiral dinuclear Au(i) halide complexes ligated by ortho-xylyl-linked bis-N-heterocyclic carbene (NHC) ligands. A broad range of functional groups are tolerated as wingtip substituents, allowing for the synthesis of a variety of functionalized chiral Au13 nanoclusters. Single crystal X-ray crystallography confirmed the molecular formula to be [Au13(bisNHC)5Cl2]Cl3, with a chiral helical arrangement of the five bidentate NHC ligands around the icosahedral Au13 core. This Au13 nanocluster is highly luminescent, with a quantum yield of 23%. The two enantiomers of the Au13 clusters can be separated by chiral HPLC, and the isolated enantiomers were characterized by circular dichroism spectroscopy. The clusters show remarkable stability, including configurational stability, opening the door to further investigation of the effect of chirality on these clusters.
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Affiliation(s)
- Hong Yi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University Furo Chikusa Nagoya 464-8602 Japan
| | - Kimberly M Osten
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University Furo Chikusa Nagoya 464-8602 Japan
| | - Tetyana I Levchenko
- Department of Chemistry, Queen's University Chernoff Hall Kingston Ontario K7L 3N6 Canada
| | - Alex J Veinot
- Department of Chemistry, Queen's University Chernoff Hall Kingston Ontario K7L 3N6 Canada
| | - Yoshitaka Aramaki
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University Furo Chikusa Nagoya 464-8602 Japan
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University Nagoya 464-8601 Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University Furo Chikusa Nagoya 464-8602 Japan
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University Nagoya 464-8601 Japan
| | - Masakazu Nambo
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University Furo Chikusa Nagoya 464-8602 Japan
| | - Cathleen M Crudden
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University Furo Chikusa Nagoya 464-8602 Japan
- Department of Chemistry, Queen's University Chernoff Hall Kingston Ontario K7L 3N6 Canada
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8
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Rival JV, Mymoona P, Lakshmi KM, Pradeep T, Shibu ES. Self-Assembly of Precision Noble Metal Nanoclusters: Hierarchical Structural Complexity, Colloidal Superstructures, and Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2005718. [PMID: 33491918 DOI: 10.1002/smll.202005718] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/07/2020] [Indexed: 06/12/2023]
Abstract
Ligand protected noble metal nanoparticles are excellent building blocks for colloidal self-assembly. Metal nanoparticle self-assembly offers routes for a wide range of multifunctional nanomaterials with enhanced optoelectronic properties. The emergence of atomically precise monolayer thiol-protected noble metal nanoclusters has overcome numerous challenges such as uncontrolled aggregation, polydispersity, and directionalities faced in plasmonic nanoparticle self-assemblies. Because of their well-defined molecular compositions, enhanced stability, and diverse surface functionalities, nanoclusters offer an excellent platform for developing colloidal superstructures via the self-assembly driven by surface ligands and metal cores. More importantly, recent reports have also revealed the hierarchical structural complexity of several nanoclusters. In this review, the formulation and periodic self-assembly of different noble metal nanoclusters are focused upon. Further, self-assembly induced amplification of physicochemical properties, and their potential applications in molecular recognition, sensing, gas storage, device fabrication, bioimaging, therapeutics, and catalysis are discussed. The topics covered in this review are extensively associated with state-of-the-art achievements in the field of precision noble metal nanoclusters.
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Affiliation(s)
- Jose V Rival
- Smart Materials Lab, Electrochemical Power Sources (ECPS) Division, Council of Scientific and Industrial Research (CSIR)-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India
- Academy of Scientific and Innovative Research (AcSIR)-CSIR, Ghaziabad, Uttar Pradesh, 201002, India
| | - Paloli Mymoona
- Smart Materials Lab, Electrochemical Power Sources (ECPS) Division, Council of Scientific and Industrial Research (CSIR)-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India
- Academy of Scientific and Innovative Research (AcSIR)-CSIR, Ghaziabad, Uttar Pradesh, 201002, India
| | - Kavalloor Murali Lakshmi
- Smart Materials Lab, Electrochemical Power Sources (ECPS) Division, Council of Scientific and Industrial Research (CSIR)-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India
- Academy of Scientific and Innovative Research (AcSIR)-CSIR, Ghaziabad, Uttar Pradesh, 201002, India
| | - Thalappil Pradeep
- Department of Chemistry, DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Indian Institute of Technology (IIT) Madras, Chennai, Tamil Nadu, 600036, India
| | - Edakkattuparambil Sidharth Shibu
- Smart Materials Lab, Electrochemical Power Sources (ECPS) Division, Council of Scientific and Industrial Research (CSIR)-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India
- Academy of Scientific and Innovative Research (AcSIR)-CSIR, Ghaziabad, Uttar Pradesh, 201002, India
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9
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Liu W, Wang J, Yuan S, Chen X, Wang Q. Chiral Superatomic Nanoclusters Ag
47
Induced by the Ligation of Amino Acids. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100972] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Wen‐Di Liu
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
| | - Jia‐Qi Wang
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
| | - Shang‐Fu Yuan
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
| | - Xi Chen
- Department of Applied Physics Aalto University Otakaari 1 02150 Espoo Finland
| | - Quan‐Ming Wang
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
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10
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Liu W, Wang J, Yuan S, Chen X, Wang Q. Chiral Superatomic Nanoclusters Ag
47
Induced by the Ligation of Amino Acids. Angew Chem Int Ed Engl 2021; 60:11430-11435. [DOI: 10.1002/anie.202100972] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Indexed: 11/06/2022]
Affiliation(s)
- Wen‐Di Liu
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
| | - Jia‐Qi Wang
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
| | - Shang‐Fu Yuan
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
| | - Xi Chen
- Department of Applied Physics Aalto University Otakaari 1 02150 Espoo Finland
| | - Quan‐Ming Wang
- Department of Chemistry, Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing 100084 P. R. China
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11
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Milcendeau P, Sabat N, Ferry A, Guinchard X. Gold-catalyzed enantioselective functionalization of indoles. Org Biomol Chem 2020; 18:6006-6017. [DOI: 10.1039/d0ob01245a] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
This review documents the potential of enantioselective gold catalysis for the functionalization of indoles.
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Affiliation(s)
- Pierre Milcendeau
- Université Paris-Saclay
- CNRS
- Institut de Chimie des Substances Naturelles
- UPR 2301
- Gif-sur-Yvette
| | - Nazarii Sabat
- Université Paris-Saclay
- CNRS
- Institut de Chimie des Substances Naturelles
- UPR 2301
- Gif-sur-Yvette
| | | | - Xavier Guinchard
- Université Paris-Saclay
- CNRS
- Institut de Chimie des Substances Naturelles
- UPR 2301
- Gif-sur-Yvette
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12
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Sato Y, Mitani M, Yao H. Chirality in Au9 clusters protected by chiral/achiral mixed bidentate phosphine ligands: influence of the metal core and ligand array. Phys Chem Chem Phys 2019; 21:14984-14991. [DOI: 10.1039/c9cp02341k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Modulation of chiroptical activity in Au9 clusters by mixed-diphosphine ligation is associated with the difference in the degree of chirality of the cluster core.
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Affiliation(s)
- Yasuhiko Sato
- Division of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Mie 514-8507
- Japan
| | - Masaki Mitani
- Division of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Mie 514-8507
- Japan
| | - Hiroshi Yao
- Division of Chemistry for Materials
- Graduate School of Engineering
- Mie University
- Mie 514-8507
- Japan
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13
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Li YZ, Leong WK. A comparative study on atomically precise Au nanoclusters as catalysts for the aldehyde–alkyne–amine (A3) coupling reaction: ligand effects on the nature of the catalysis and efficiency. RSC Adv 2019; 9:5475-5479. [PMID: 35515902 PMCID: PMC9060790 DOI: 10.1039/c9ra00933g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 02/06/2019] [Indexed: 12/23/2022] Open
Abstract
Atomically precise Au13 nanoclusters stabilized by stibines catalyze the aldehyde–alkyne–amine coupling reaction more efficiently than those stabilized by thiols or phosphines. The nature of the catalytic activity is also different, and may be attributed to the weaker coordinating ability of the stibine ligands. A stibine-stabilised gold nanocluster which acts as a homogeneous catalyst in the A3 coupling reaction.![]()
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Affiliation(s)
- Ying-Zhou Li
- Division of Chemistry & Biological Chemistry
- Nanyang Technological University
- Singapore
- Shandong Provincial Key Laboratory of Molecular Engineering
- Qilu University of Technology (Shandong Academy of Science)
| | - Weng Kee Leong
- Division of Chemistry & Biological Chemistry
- Nanyang Technological University
- Singapore
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14
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Himmelstrup J, Buendia MB, Sun XW, Kramer S. Enantioselective aryl–aryl coupling facilitated by chiral binuclear gold complexes. Chem Commun (Camb) 2019; 55:12988-12991. [DOI: 10.1039/c9cc07175j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The first example of highly enantioselective aryl–aryl coupling mediated by chiral gold complexes is reported.
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Affiliation(s)
- Jonas Himmelstrup
- Department of Chemistry
- Technical University of Denmark
- 2800 Kgs. Lyngby
- Denmark
| | - Mikkel B. Buendia
- Department of Chemistry
- Technical University of Denmark
- 2800 Kgs. Lyngby
- Denmark
| | - Xing-Wen Sun
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
| | - Søren Kramer
- Department of Chemistry
- Technical University of Denmark
- 2800 Kgs. Lyngby
- Denmark
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15
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Szőllősi G. Asymmetric one-pot reactions using heterogeneous chemical catalysis: recent steps towards sustainable processes. Catal Sci Technol 2018. [DOI: 10.1039/c7cy01671a] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Asymmetric one-pot reactions applying heterogeneous chemical catalysts and unifying the benefits of these catalytic materials with the advantages of one-pot methods, are surveyed.
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Affiliation(s)
- György Szőllősi
- MTA-SZTE Stereochemistry Research Group
- University of Szeged
- H-6720 Szeged, Dóm tér 8
- Hungary
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16
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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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17
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Price GA, Brisdon AK, Randall S, Lewis E, Whittaker DM, Pritchard RG, Muryn CA, Flower KR, Quayle P. Some insights into the gold-catalysed A 3 -coupling reaction. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.06.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Chakraborty I, Pradeep T. Atomically Precise Clusters of Noble Metals: Emerging Link between Atoms and Nanoparticles. Chem Rev 2017; 117:8208-8271. [DOI: 10.1021/acs.chemrev.6b00769] [Citation(s) in RCA: 1305] [Impact Index Per Article: 186.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Indranath Chakraborty
- DST Unit of Nanoscience (DST
UNS) and Thematic Unit of Excellence, Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Thalappil Pradeep
- DST Unit of Nanoscience (DST
UNS) and Thematic Unit of Excellence, Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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19
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Ma W, Xu L, de Moura AF, Wu X, Kuang H, Xu C, Kotov NA. Chiral Inorganic Nanostructures. Chem Rev 2017; 117:8041-8093. [DOI: 10.1021/acs.chemrev.6b00755] [Citation(s) in RCA: 485] [Impact Index Per Article: 69.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - André F. de Moura
- Department
of Chemistry, Federal University of São Carlos, CP 676, CEP 13.565-905, São Carlos, SP, Brazil
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20
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Vilhanová B, Václavík J, Artiglia L, Ranocchiari M, Togni A, van Bokhoven JA. Subnanometer Gold Clusters on Amino-Functionalized Silica: An Efficient Catalyst for the Synthesis of 1,3-Diynes by Oxidative Alkyne Coupling. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00691] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Beáta Vilhanová
- Department
of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, Vladimir-Prelog-Weg 1-2, 8093 Zürich, Switzerland
- Department
of Organic Technology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech Republic
| | - Jiří Václavík
- Department
of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, Vladimir-Prelog-Weg 1-2, 8093 Zürich, Switzerland
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, 166 10 Prague, Czech Republic
| | - Luca Artiglia
- Laboratory
for Catalysis and Sustainable Chemistry, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland
| | - Marco Ranocchiari
- Laboratory
for Catalysis and Sustainable Chemistry, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland
| | - Antonio Togni
- Department
of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, Vladimir-Prelog-Weg 1-2, 8093 Zürich, Switzerland
| | - Jeroen A. van Bokhoven
- Department
of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, Vladimir-Prelog-Weg 1-2, 8093 Zürich, Switzerland
- Laboratory
for Catalysis and Sustainable Chemistry, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland
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21
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Huang T, Huang L, Jiang Y, Hu F, Sun Z, Pan G, Wei S. Direct self-focusing synthesis of monodisperse [Au8(PPh3)7]2+ nanoclusters. Dalton Trans 2017; 46:12239-12244. [DOI: 10.1039/c7dt02657a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Direct synthesis of atomically monodisperse Au8 nanoclusters via the self-focusing process during NaBH4 reduction of Au(PPh3)2Cl.
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Affiliation(s)
- Ting Huang
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- P. R. China
| | - Li Huang
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- P. R. China
| | - Yong Jiang
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- P. R. China
| | - Fengchun Hu
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- P. R. China
| | - Zhihu Sun
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- P. R. China
| | - Guoqiang Pan
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- P. R. China
| | - Shiqiang Wei
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- P. R. China
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22
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Yao LY, Yam VWW. Diphosphine-Stabilized Small Gold Nanoclusters: From Crystal Structure Determination to Ligation-Driven Symmetry Breaking and Anion Exchange Properties. J Am Chem Soc 2016; 138:15736-15742. [DOI: 10.1021/jacs.6b10168] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Liao-Yuan Yao
- Institute of Molecular Functional
Materials (Areas of Excellence Scheme, University Grants Committee
(Hong Kong)) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, P. R. China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional
Materials (Areas of Excellence Scheme, University Grants Committee
(Hong Kong)) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, P. R. China
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23
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Takano S, Tsukuda T. Amplification of the Optical Activity of Gold Clusters by the Proximity of BINAP. J Phys Chem Lett 2016; 7:4509-4513. [PMID: 27784158 DOI: 10.1021/acs.jpclett.6b02294] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Despite recent progress in the synthesis and characterization of optically active gold clusters, the factor determining optical rotatory strength has not been clarified due to the lack of structurally resolved, enantiomerically pure Au clusters. We addressed this issue by studying the correlation between the optical activity and geometrical structures of two types of Au clusters that were protected by chiral diphosphines: [Au11(R/S-DIOP)4Cl2]+ (DIOP = 1,4-bis(diphenylphosphino)-2,3-o-isopropylidene-2,3-butanediol) and [Au8(R/S-BINAP)3(PPh3)2]2+ (BINAP = 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl). [Au8(BINAP)3(PPh3)2]2+ showed stronger rotatory strengths than [Au11(DIOP)4Cl2]+ in the visible region, while the Hausdorff chirality measure calculated from the crystal data indicated that the Au core of the former is less chiral than that of the latter. We propose that the optical activity in the Au core-based transition due to the deformed core is further amplified by chiral arrangement of the binaphthyl moiety near the Au core.
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Affiliation(s)
- Shinjiro Takano
- Department of Chemistry, School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tatsuya Tsukuda
- Department of Chemistry, School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Elements Strategy Initiative for Catalysis and Batteries (ESICB), Kyoto University , Katsura, Kyoto 615-8520, Japan
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24
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Neaţu F, Ciobanu M, Ştoflea LE, Frunză L, Pârvulescu VI, Michelet V. Arylation of alkynes over hydrotalcite docked Rh-m-TPPTC complex. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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25
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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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26
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Barreiro EM, Boltukhina EV, White AJP, Hii KK(M. Atropisomeric [(diphosphine)Au2 Cl2 ] complexes and their catalytic activity towards asymmetric cycloisomerisation of 1,6-enynes. Chemistry 2015; 21:2686-90. [PMID: 25504519 PMCID: PMC4524423 DOI: 10.1002/chem.201404496] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Indexed: 11/22/2022]
Abstract
X-ray crystal structures of two [(diphosphine)Au2 Cl2 ] complexes (in which diphosphine=P-Phos and xylyl-P-Phos; P-Phos=[2,2',6,6'-Tetramethoxy-4,4'-bis(diphenylphosphino)-3,3'-bipyridine]) were determined and compared to the reported structures of similar atropisomeric gold complexes. Correlations between the Au⋅⋅⋅Au distances and torsional angles for the biaryl series of ligands (MeOBIPHEP, SEGPhos, and P-Phos; BIPHEP=2,2'-bis(diphenylphosphino)-1,1'-biphenyl, SEGPhos=[(4,4'-bi-1,3-benzodioxole)-5,5'-diyl]bis[diphenylphosphine]) can be made; these measurements appear to be very dependent upon the phosphorous substituent. Conversely, the same effect was not observed for ligands based on the binaphthyl (BINAP) series. The catalytic activity of these complexes was subsequently assessed in the enantioselective cycloisomerisation of 1,6-enynes and revealed an over-riding electronic effect: more-electron-rich phosphines promote greater enantioselectivity. The possibility of silver acting as a (co-)catalyst was ruled out in these reactions.
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Affiliation(s)
- Elena M Barreiro
- Department of Chemistry, Imperial College LondonExhibition Road, South Kensington, London SW7 2AZ (UK) E-mail:
| | | | - Andrew J P White
- Department of Chemistry, Imperial College LondonExhibition Road, South Kensington, London SW7 2AZ (UK) E-mail:
| | - King Kuok (Mimi) Hii
- Department of Chemistry, Imperial College LondonExhibition Road, South Kensington, London SW7 2AZ (UK) E-mail:
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27
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Valencia I, Ávila-Torres Y, Barba-Behrens N, Garzón IL. Structural, vibrational, and electronic properties of an uncoordinated pseudoephedrine derivative and its mononuclear and trinuclear copper(II)-coordinated compounds: A combined theoretical and experimental study. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.08.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Nishigaki JI, Koyasu K, Tsukuda T. Chemically Modified Gold Superatoms and Superatomic Molecules. CHEM REC 2014; 14:897-909. [DOI: 10.1002/tcr.201402011] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Indexed: 01/25/2023]
Affiliation(s)
- Jun-ichi Nishigaki
- Department of Chemistry; School of Science; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Kiichirou Koyasu
- Department of Chemistry; School of Science; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Tatsuya Tsukuda
- Department of Chemistry; School of Science; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB); Kyoto University; Katsura Kyoto 615-8520 Japan
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29
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Pradal A, Gladiali S, Michelet V, Toullec PY. Combinatorial approach to chiral tris-ligated carbophilic platinum complexes: application to asymmetric catalysis. Chemistry 2014; 20:7128-35. [PMID: 24757042 DOI: 10.1002/chem.201304794] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 02/17/2014] [Indexed: 11/09/2022]
Abstract
A straightforward methodology for the synthesis of libraries of chiral tris-ligated cationic platinum complexes and their in situ evaluation as asymmetric carbophilic catalysts in a model domino hydroarylation/cyclization reaction of a 1,6-enyne was developed. A catalyst-generation process based on a combination of a monodentate and a bidentate phosphorus ligand allowed the formation of 108 chiral complexes. One-pot screening of the stereoinduction obtained with this library in a test domino addition/cyclization reaction validated this approach and stressed the key role played by the monodentate ligand partner in obtaining high enantioselectivities. In the case of two challenging substrate/nucleophile combinations, the combinatorial approach resulted in a significant gain in enantioselectivity.
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Affiliation(s)
- Alexandre Pradal
- Institut de Recherche de Chimie Paris, UMR 8247, Chimie ParisTech, ENSCP, 11, rue Pierre et Marie Curie, 75231 Paris CEDEX 05 (France), Fax: (+33) 144071062
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30
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Hidalgo F, Noguez C, Olvera de la Cruz M. Metallic influence on the atomic structure and optical activity of ligand-protected nanoparticles: a comparison between Ag and Au. NANOSCALE 2014; 6:3325-3334. [PMID: 24519723 DOI: 10.1039/c3nr06202c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Using time-perturbed density functional theory the optical activity of metal-thiolate compounds formed by highly symmetric Ag and Au nanoparticles (NPs) and a methyl-thiol molecule is studied after performing atomic optimizations and electronic calculations upon adsorption. Many different sites and orientations of the adsorbed molecule on icosahedral Ag and Au NPs of 55 atoms are considered. Upon molecular adsorption atomic distortions on Au NPs are induced while not on Ag, which causes higher molecular adsorption energies in Au than in Ag. Structural distortions and the specific molecular adsorption site and orientation result in chiral metal-thiolate NPs. Ag and Au compounds with similar chirality, according to Hausdorff chirality measurements, show different optical activity signatures, where circular dichroism spectra of Au NPs are more intense. These dissimilarities are attributed in part to the differences in the electronic density of states, which are a consequence of relativistic effects and the atomic distortion. It is concluded that the optical activity of Ag and Au compounds is due to different mechanisms, while in Au it is mainly due to the atomic distortion of the metallic NPs induced after molecular adsorption, in Ag it is defined by the adsorption site and molecular orientation with respect to the NP symmetry.
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Affiliation(s)
- Francisco Hidalgo
- Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, Mexico D. F. 01000, Mexico.
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31
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Konishi K. Phosphine-Coordinated Pure-Gold Clusters: Diverse Geometrical Structures and Unique Optical Properties/Responses. STRUCTURE AND BONDING 2014. [DOI: 10.1007/430_2014_143] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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32
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Johnson GE, Priest T, Laskin J. Synthesis and Characterization of Gold Clusters Ligated with 1,3-Bis(dicyclohexylphosphino)propane. Chempluschem 2013; 78:1033-1039. [DOI: 10.1002/cplu.201300134] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Indexed: 11/11/2022]
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33
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Hidalgo F, Noguez C. Optical activity of achiral ligand SCH3 adsorbed on achiral Ag55 clusters: relationship between adsorption site and circular dichroism. ACS NANO 2013; 7:513-521. [PMID: 23256525 DOI: 10.1021/nn3046083] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The electronic circular dichroism (CD) spectra of a methyl-thiol adsorbed at different sites on an icosahedral silver nanoparticle is studied by using time-perturbed density functional theory. Despite that separately molecule and nanoparticle are achiral and consequently optically inactive, the Ag(55)-SCH(3) compound emerges with a new symmetry, which may be chiral or not depending on the adsorption site and orientation of the molecule. It is found that chirality is favored when the thiol is adsorbed between two atoms of different coordination number. Chiral compounds have characteristic CD spectra in the UV-visible region, where Ag(55) shows optical absorption but SCH(3) does not; revealing that highly degenerated molecular-like electronic states of Ag(55) are modified by the presence of the molecule inducing optical activity. It is concluded that CD line-shapes and magnitude strongly depend on the site where the adsorption takes place, while its intensity is modulated by the molecule orientation.
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Affiliation(s)
- Francisco Hidalgo
- Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, México D.F. 01000, México
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34
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Synthesis and characterization of a tetranuclear copper(II) complex with a chiral Schiff base ligand. CHINESE CHEM LETT 2013. [DOI: 10.1016/j.cclet.2012.11.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Xiang H, Lan Y, Jiang L, Zhang WX, Anson CE, Lu TB, Powell AK. A chiral tetranuclear copper(II) complex based on a new Schiff-base ligand: Synthesis, structure, magnetic property and CD spectra. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2011.11.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Axially chiral N-heterocyclic carbene gold(I) complex catalyzed asymmetric Friedel–Crafts/cyclization reaction of nitrogen-tethered 1,6-enynes with indole derivatives. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.12.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Pradal A, Chao CM, Toullec PY, Michelet V. Asymmetric Au-catalyzed cycloisomerization of 1,6-enynes: An entry to bicyclo[4.1.0]heptene. Beilstein J Org Chem 2011; 7:1021-9. [PMID: 21915203 PMCID: PMC3169187 DOI: 10.3762/bjoc.7.116] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Accepted: 07/12/2011] [Indexed: 11/23/2022] Open
Abstract
A comprehensive study on the asymmetric gold-catalyzed cycloisomerization reaction of heteroatom tethered 1,6-enynes is described. The cycloisomerization reactions were conducted in the presence of the chiral cationic Au(I) catalyst consisting of (R)-4-MeO-3,5-(t-Bu)(2)-MeOBIPHEP-(AuCl)(2) complex and silver salts (AgOTf or AgNTf(2)) in toluene under mild conditions to afford functionalized bicyclo[4.1.0]heptene derivatives. The reaction conditions were found to be highly substrate-dependent, the best results being obtained in the case of oxygen-tethered enynes. The formation of bicyclic derivatives, including cyclopropyl pentasubstituted ones, was reported in moderate to good yields and in enantiomeric excesses up to 99%.
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Affiliation(s)
- Alexandre Pradal
- Laboratoire Charles Friedel, UMR 7223, Ecole Nationale Supérieure de Chimie de Paris, Chimie ParisTech, 11 rue P. et M. Curie, F-75231 Paris Cedex 05, France
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38
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Kamei Y, Shichibu Y, Konishi K. Generation of Small Gold Clusters with Unique Geometries through Cluster-to-Cluster Transformations: Octanuclear Clusters with Edge-sharing Gold Tetrahedron Motifs. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102901] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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39
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Kamei Y, Shichibu Y, Konishi K. Generation of Small Gold Clusters with Unique Geometries through Cluster-to-Cluster Transformations: Octanuclear Clusters with Edge-sharing Gold Tetrahedron Motifs. Angew Chem Int Ed Engl 2011; 50:7442-5. [DOI: 10.1002/anie.201102901] [Citation(s) in RCA: 122] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Indexed: 11/12/2022]
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40
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Leseurre L, Le Boucher d’Herouville F, Püntener K, Scalone M, Genêt JP, Michelet V. Efficient Route to Atropisomeric Ligands – Application to the Synthesis of MeOBIPHEP Analogues. Org Lett 2011; 13:3250-3. [DOI: 10.1021/ol2011874] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lucie Leseurre
- Chimie ParisTech, UMR 7223, Laboratoire Charles Friedel 11 rue P. et M. Curie, 75231 Paris Cedex 05, France, and Process Research & Synthesis CoE Catalysis, F. Hoffmann-La Roche AG, CH-4070 Basel, Switzerland
| | - Florent Le Boucher d’Herouville
- Chimie ParisTech, UMR 7223, Laboratoire Charles Friedel 11 rue P. et M. Curie, 75231 Paris Cedex 05, France, and Process Research & Synthesis CoE Catalysis, F. Hoffmann-La Roche AG, CH-4070 Basel, Switzerland
| | - Kurt Püntener
- Chimie ParisTech, UMR 7223, Laboratoire Charles Friedel 11 rue P. et M. Curie, 75231 Paris Cedex 05, France, and Process Research & Synthesis CoE Catalysis, F. Hoffmann-La Roche AG, CH-4070 Basel, Switzerland
| | - Michelangelo Scalone
- Chimie ParisTech, UMR 7223, Laboratoire Charles Friedel 11 rue P. et M. Curie, 75231 Paris Cedex 05, France, and Process Research & Synthesis CoE Catalysis, F. Hoffmann-La Roche AG, CH-4070 Basel, Switzerland
| | - Jean-Pierre Genêt
- Chimie ParisTech, UMR 7223, Laboratoire Charles Friedel 11 rue P. et M. Curie, 75231 Paris Cedex 05, France, and Process Research & Synthesis CoE Catalysis, F. Hoffmann-La Roche AG, CH-4070 Basel, Switzerland
| | - Véronique Michelet
- Chimie ParisTech, UMR 7223, Laboratoire Charles Friedel 11 rue P. et M. Curie, 75231 Paris Cedex 05, France, and Process Research & Synthesis CoE Catalysis, F. Hoffmann-La Roche AG, CH-4070 Basel, Switzerland
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41
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Friederici M, Angurell I, Seco M, Rossell O, Llorca J. Synthetic strategies for the surface functionalisation of gold nanoparticles with metals and metal clusters. Dalton Trans 2011; 40:7934-40. [DOI: 10.1039/c1dt10456j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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