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Borsley S, Leigh DA, Roberts BMW. Molecular Ratchets and Kinetic Asymmetry: Giving Chemistry Direction. Angew Chem Int Ed Engl 2024; 63:e202400495. [PMID: 38568047 DOI: 10.1002/anie.202400495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Indexed: 05/03/2024]
Abstract
Over the last two decades ratchet mechanisms have transformed the understanding and design of stochastic molecular systems-biological, chemical and physical-in a move away from the mechanical macroscopic analogies that dominated thinking regarding molecular dynamics in the 1990s and early 2000s (e.g. pistons, springs, etc), to the more scale-relevant concepts that underpin out-of-equilibrium research in the molecular sciences today. Ratcheting has established molecular nanotechnology as a research frontier for energy transduction and metabolism, and has enabled the reverse engineering of biomolecular machinery, delivering insights into how molecules 'walk' and track-based synthesisers operate, how the acceleration of chemical reactions enables energy to be transduced by catalysts (both motor proteins and synthetic catalysts), and how dynamic systems can be driven away from equilibrium through catalysis. The recognition of molecular ratchet mechanisms in biology, and their invention in synthetic systems, is proving significant in areas as diverse as supramolecular chemistry, systems chemistry, dynamic covalent chemistry, DNA nanotechnology, polymer and materials science, molecular biology, heterogeneous catalysis, endergonic synthesis, the origin of life, and many other branches of chemical science. Put simply, ratchet mechanisms give chemistry direction. Kinetic asymmetry, the key feature of ratcheting, is the dynamic counterpart of structural asymmetry (i.e. chirality). Given the ubiquity of ratchet mechanisms in endergonic chemical processes in biology, and their significance for behaviour and function from systems to synthesis, it is surely just as fundamentally important. This Review charts the recognition, invention and development of molecular ratchets, focussing particularly on the role for which they were originally envisaged in chemistry, as design elements for molecular machinery. Different kinetically asymmetric systems are compared, and the consequences of their dynamic behaviour discussed. These archetypal examples demonstrate how chemical systems can be driven inexorably away from equilibrium, rather than relax towards it.
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Affiliation(s)
- Stefan Borsley
- Department of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, United Kingdom
| | - David A Leigh
- Department of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, United Kingdom
| | - Benjamin M W Roberts
- Department of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, United Kingdom
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2
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Saura-Sanmartin A. Synthesis of 'Impossible' Rotaxanes. Chemistry 2024; 30:e202304025. [PMID: 38168751 DOI: 10.1002/chem.202304025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 12/31/2023] [Accepted: 01/03/2024] [Indexed: 01/05/2024]
Abstract
'Impossible' rotaxanes, which are constituted by interlocked components without obvious binding motifs, have attracted the interest of the mechanically interlocked molecules (MIMs) community. Within the synthetic efforts reported in the last decades towards the preparation of MIMs, some innovative protocols for accessing 'impossible' rotaxanes have been developed. This short review highlights different selected synthetic examples of 'impossible' rotaxanes, as well as suggests some future directions of this research area.
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Affiliation(s)
- Adrian Saura-Sanmartin
- Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30100, Murcia, Spain
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3
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Han H, Seale JSW, Feng L, Qiu Y, Stoddart JF. Sequence‐controlled synthesis of rotaxanes. JOURNAL OF POLYMER SCIENCE 2023. [DOI: 10.1002/pol.20220691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Han Han
- Department of Chemistry Northwestern University Evanston Illinois USA
| | - James S. W. Seale
- Department of Chemistry Northwestern University Evanston Illinois USA
| | - Liang Feng
- Department of Chemistry Northwestern University Evanston Illinois USA
| | - Yunyan Qiu
- Department of Chemistry National University of Singapore Singapore Republic of Singapore
| | - J. Fraser Stoddart
- Department of Chemistry Northwestern University Evanston Illinois USA
- School of Chemistry University of New South Wales Sydney Australia
- Department of Chemistry, Stoddart Institute of Molecular Science Zhejiang University Hangzhou China
- ZJU‐Hangzhou Global Scientific and Technological Innovation Center Hangzhou China
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4
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Lauer JC, Bhat AS, Barwig C, Fritz N, Kirschbaum T, Rominger F, Mastalerz M. [2+3] Amide Cages by Oxidation of [2+3] Imine Cages – Revisiting Molecular Hosts for Highly Efficient Nitrate Binding. Chemistry 2022; 28:e202201527. [PMID: 35699158 PMCID: PMC9544679 DOI: 10.1002/chem.202201527] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Indexed: 11/16/2022]
Abstract
The pollution of groundwater with nitrate is a serious issue because nitrate can cause several diseases such as methemoglobinemia or cancer. Therefore, selective removal of nitrate by efficient binding to supramolecular hosts is highly desired. Here we describe how to make [2+3] amide cages in very high to quantitative yields by applying an optimized Pinnick oxidation protocol for the conversion of corresponding imine cages. By NMR titration experiments of the eight different [2+3] amide cages with nitrate, chloride and hydrogen sulfate we identified one cage with an unprecedented high selectivity towards nitrate binding vs. chloride (S=705) or hydrogensulfate (S>13500) in CD2Cl2/CD3CN (1 : 3). NMR experiments as well as single‐crystal structure comparison of host‐guest complexes give insight into structure‐property‐relationships.
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Affiliation(s)
- Jochen C. Lauer
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Avinash S. Bhat
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Chantal Barwig
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Nathalie Fritz
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Tobias Kirschbaum
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Frank Rominger
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Michael Mastalerz
- Organisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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5
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Binks L, Tian C, Fielden SDP, Vitorica-Yrezabal IJ, Leigh DA. Transamidation-Driven Molecular Pumps. J Am Chem Soc 2022; 144:15838-15844. [PMID: 35979923 PMCID: PMC9446885 DOI: 10.1021/jacs.2c06807] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We report a new class of synthetic molecular pumps that use a stepwise information ratchet mechanism to achieve the kinetic gating required to sequester their macrocyclic substrates from bulk solution. Threading occurs as a result of active template reactions between the pump terminus amine and an acyl electrophile, whereby the bond-forming reaction is accelerated through the cavity of a crown ether. Carboxylation of the resulting amide results in displacement of the ring to the collection region of the thread. Conversion of the carbamate to a phenolic ester provides an intermediate rotaxane suitable for further pumping cycles. In this way rings can be ratcheted onto a thread from one or both ends of appropriately designed molecular pumps. Each pumping cycle results in one additional ring being added to the thread per terminus acyl group. The absence of pseudorotaxane states ensures that no dethreading of intermediates occurs during the pump operation. This facilitates the loading of different macrocycles in any chosen sequence, illustrated by the pump-mediated synthesis of a [4]rotaxane containing three different macrocycles as a single sequence isomer. A [5]rotaxane synthesized using a dual-opening transamidation pump was structurally characterized by single-crystal X-ray diffraction, revealing a series of stabilizing CH···O interactions between the crown ethers and the polyethylene glycol catchment region of the thread.
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Affiliation(s)
- Lorna Binks
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Chong Tian
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Stephen D P Fielden
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | | | - David A Leigh
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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6
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Thomas D, Tetlow DJ, Ren Y, Kassem S, Karaca U, Leigh DA. Pumping between phases with a pulsed-fuel molecular ratchet. NATURE NANOTECHNOLOGY 2022; 17:701-707. [PMID: 35379944 DOI: 10.1038/s41565-022-01097-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 02/16/2022] [Indexed: 06/14/2023]
Abstract
The sorption of species from a solution into and onto solids underpins the sequestering of waste and pollutants, precious metal recovery, heterogeneous catalysis, analysis and separation science, and other technologies1,2. The transfer between phases tends to proceed spontaneously in the direction of equilibrium. For example, alkyl ammonium groups mounted on silica nanoparticles are used to chemisorb cucurbituril macrocycles from solution through host-guest binding3,4. Molecular ratchet mechanisms5-7, in which kinetic gating8-12 inhibits or accelerates particular steps, makes it possible to progressively drive dynamic systems13-16 away from equilibrium17-21. Here we report on molecular pumps22 immobilized on polymer beads23-25 that use an energy ratchet mechanism5,9,19-21,26-30 to directionally transport substrates from solution onto the beads. On the addition of trichloroacetic acid (CCl3CO2H)19,31-33 fuel19,34-37, micrometre-diameter polystyrene beads functionalized38 with solvent-accessible molecular pumps sequester from the solution crown ethers appended with fluorescent tags. After fuel consumption, the rings are mechanically trapped in a higher-energy, out-of-equilibrium state on the beads and cannot be removed by dilution or exhaustive washing. This differs from dissipative assembled materials11,13-16, which require a continuous supply of energy to persist, and from conventional host-guest complexes. The addition of a second fuel pulse causes the uptake of more macrocycles, which drives the system further away from equilibrium. The second macrocycle can be labelled with a different fluorescent tag, which confers sequence information39 on the absorbed structure. The polymer-bound substrates can be released back to the bulk either one compartment at a time or all at once. Non-equilibrium40 sorption by immobilized artificial molecular machines41-45 enables the transduction of energy from chemical fuels for the use, storage and release of energy and information.
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Affiliation(s)
- Dean Thomas
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Daniel J Tetlow
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Yansong Ren
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Salma Kassem
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Ulvi Karaca
- Department of Chemistry, University of Manchester, Manchester, UK
| | - David A Leigh
- Department of Chemistry, University of Manchester, Manchester, UK.
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, China.
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Hoshino S, Ono K, Kawai H. Ring-Over-Ring Deslipping From Imine-Bridged Heterorotaxanes. Front Chem 2022; 10:885939. [PMID: 35592307 PMCID: PMC9110657 DOI: 10.3389/fchem.2022.885939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 03/28/2022] [Indexed: 11/19/2022] Open
Abstract
Ring-over-ring slippage and ring-through-ring penetration are important processes in the construction of ring-in-ring multiple interlocked architectures. We have successfully observed “ring-over-ring deslipping” on the rotaxane axle by exploiting the dynamic covalent nature of imine bonds in imine-bridged heterorotaxanes R1 and R2 with two macrocycles of different ring sizes on the axle. When the imine bridges of R1 were cleaved, a hydrolyzed hetero[4]rotaxane [4]R1′ was formed as an intermediate under dynamic equilibrium, and the larger 38-membered macrocycle M was deslipped over the 24-membered ring (24C8 or DB24C8) to dissociate into a [3]rotaxane [3]R3 and a macrocycle M. The time dependent NMR measurement and the determined thermodynamic parameters revealed that the rate-limiting step of the deslipping process was attributed to steric hindrance between two rings and reduced mobility of M due to proximity to the crown ether, which was bound to the anilinium on the axle molecule.
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Affiliation(s)
- Sayaka Hoshino
- Department of Chemistry, Faculty of Science, Tokyo University of Science, Tokyo, Japan
| | - Kosuke Ono
- Department of Chemistry, Tokyo Institute of Technology, Tokyo, Japan
| | - Hidetoshi Kawai
- Department of Chemistry, Faculty of Science, Tokyo University of Science, Tokyo, Japan
- *Correspondence: Hidetoshi Kawai,
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8
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Au-Yeung HY, Deng Y. Distinctive features and challenges in catenane chemistry. Chem Sci 2022; 13:3315-3334. [PMID: 35432874 PMCID: PMC8943846 DOI: 10.1039/d1sc05391d] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 02/04/2022] [Indexed: 11/21/2022] Open
Abstract
From being an aesthetic molecular object to a building block for the construction of molecular machines, catenanes and related mechanically interlocked molecules (MIMs) continue to attract immense interest in many research areas. Catenane chemistry is closely tied to that of rotaxanes and knots, and involves concepts like mechanical bonds, chemical topology and co-conformation that are unique to these molecules. Yet, because of their different topological structures and mechanical bond properties, there are some fundamental differences between the chemistry of catenanes and that of rotaxanes and knots although the boundary is sometimes blurred. Clearly distinguishing these differences, in aspects of bonding, structure, synthesis and properties, between catenanes and other MIMs is therefore of fundamental importance to understand their chemistry and explore the new opportunities from mechanical bonds.
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Affiliation(s)
- Ho Yu Au-Yeung
- Department of Chemistry, The University of Hong Kong Pokfulam Road Hong Kong P. R. China
- State Key Laboratory of Synthetic Chemistry, The University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Yulin Deng
- Department of Chemistry, The University of Hong Kong Pokfulam Road Hong Kong P. R. China
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9
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Li A, Tan Z, Hu Y, Lu Z, Yuan J, Li X, Xie J, Zhang J, Zhu K. Precise Control of Radial Catenane Synthesis via Clipping and Pumping. J Am Chem Soc 2022; 144:2085-2089. [DOI: 10.1021/jacs.1c12303] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Anquan Li
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Zhengqi Tan
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Yiheng Hu
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Zonghuan Lu
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jun Yuan
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Xia Li
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jialin Xie
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jiangwei Zhang
- Dalian National Laboratory for Clean Energy & State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Kelong Zhu
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
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10
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Gaedke M, Hupatz H, Witte F, Rupf SM, Douglas C, Schröder HV, Fischer L, Malischewski M, Paulus B, Schalley CA. Sequence-sorted redox-switchable hetero[3]rotaxanes. Org Chem Front 2022. [DOI: 10.1039/d1qo01553b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Programming the sequence of functional units in redox-switchable hetero[3]rotaxanes is achieved by integrative self-sorting for a library of five crown ethers.
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Affiliation(s)
- Marius Gaedke
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 20, 14195 Berlin, Germany
| | - Henrik Hupatz
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 20, 14195 Berlin, Germany
| | - Felix Witte
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Susanne M. Rupf
- Institut für Chemie und Biochemie der Freien Universität Berlin, Fabeckstr. 34/36, 14195 Berlin, Germany
| | - Clara Douglas
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 20, 14195 Berlin, Germany
| | - Hendrik V. Schröder
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 20, 14195 Berlin, Germany
| | - Lukas Fischer
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 20, 14195 Berlin, Germany
| | - Moritz Malischewski
- Institut für Chemie und Biochemie der Freien Universität Berlin, Fabeckstr. 34/36, 14195 Berlin, Germany
| | - Beate Paulus
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Christoph A. Schalley
- Institut für Chemie und Biochemie der Freien Universität Berlin, Arnimallee 20, 14195 Berlin, Germany
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11
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Masai H, Oka Y, Terao J. Precision synthesis of linear oligorotaxanes and polyrotaxanes achieving well-defined positions and numbers of cyclic components on the axle. Chem Commun (Camb) 2021; 58:1644-1660. [PMID: 34927653 DOI: 10.1039/d1cc03507j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Interest in macromolecules has increased because of their functional properties, which can be tuned using precise organic synthetic methods. For example, desired functions have been imparted by controlling the nanoscale structures of such macromolecules. In particular, compounds with interlocked structures, including rotaxanes, have attracted attention because of their unique supramolecular structures. In such supramolecular structures, the mobility and freedom of the macrocycles are restricted by an axle and dependent on those of other macrocycles, which imparts unique functions to these threaded structures. Recently, methods for the ultrafine engineering and synthesis, as well as functions, of "defined" rotaxane structures that are not statistically dispersed on the axle (i.e., control over the number and position of cyclic molecules) have been reported. Various synthetic strategies allow access to such well-defined linear oligo- and polyrotaxanes, including [1]rotaxanes and [n]rotaxanes (mostly n > 3). These state-of-the-art synthetic methods have resulted in unique functions of these oligo-and polyrotaxane materials. Herein, we review the effective synthetic protocols and functions of precisely constructed one-dimensional oligomers and polymers bearing defined threaded structures, and discuss the latest reports and trends.
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Affiliation(s)
- Hiroshi Masai
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Japan.
| | - Yuki Oka
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Japan.
| | - Jun Terao
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Japan.
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12
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Stereodynamics of E/ Z isomerization in rotaxanes through mechanical shuttling and covalent bond rotation. Chem 2021; 7:2137-2150. [PMID: 34435161 PMCID: PMC8367298 DOI: 10.1016/j.chempr.2021.04.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 01/18/2021] [Accepted: 04/19/2021] [Indexed: 11/20/2022]
Abstract
The mechanical bond has opened a new world for structural and dynamic stereochemistry, which is still largely underexplored and whose significance for various applications is becoming increasingly evident. We demonstrate that designed rearrangements involving both covalent and mechanical bonds can be integrated in [2]rotaxanes, leading to interesting consequences in terms of E/Z isomerization mechanisms. Two entirely distinct and concomitant stereomutations, pertaining to the same stereogenic element but involving different kinds of linkages within the molecule, are observed and are thoroughly characterized. The rate of the two processes is affected in opposite ways upon changing solvent polarity; such a phenomenon can be used to selectively modify the rate of each motion and adjust the relative contribution of the two mechanisms to the isomerization. Although the movements are not synchronized, an analysis of the intriguing fundamental implications for transition state theory, reaction pathway bifurcation, and microscopic reversibility was triggered by our experimental observations. Rotaxanes that display E/Z stereoisomerism depending on the ring position Co-existence of two different stereomutations that yield the same product Mutual influence and opposite solvent dependence of the two dynamic processes Fundamental implications for microscopic reversibility and chemical equilibrium
The concurrence and interplay of different movements of molecular components within the same structure play a key role in providing function to naturally occurring molecular machines. Despite the progress made on artificial counterparts, the construction of molecular systems, where two (or more) motions are integrated together to produce an outcome, is still in its infancy. Molecules called rotaxanes, obtained by interlocking a ring with a dumbbell-shaped axle, are an appealing yet underexplored platform for this purpose. Here, we describe rotaxanes where two coexisting and radically different processes—rotation about a covalent bond and translation of the ring along the axle—lead to the same change in the overall molecular shape. These results are significant not only to improve our fundamental understanding of the way molecular components move but also to develop sophisticated artificial nanomachines capable of transforming or transmitting motion.
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Chan SM, Tang FK, Lam CY, Kwan CS, Hau SCK, Leung KCF. π-Stacking Stopper-Macrocycle Stabilized Dynamically Interlocked [2]Rotaxanes. Molecules 2021; 26:4704. [PMID: 34361858 PMCID: PMC8347712 DOI: 10.3390/molecules26154704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 07/30/2021] [Accepted: 08/01/2021] [Indexed: 11/16/2022] Open
Abstract
The synthesis of mechanically interlocked molecules is valuable due to their unique topologies. With π-stacking intercomponent interaction, e.g., phenanthroline and anthracene, novel [2]rotaxanes have been synthesized by dynamic imine clipping reaction. Their X-ray crystal structures indicate the π-stackings between the anthracene moiety (stopper) on the thread and the (hetero)aromatic rings at the macrocycle of the rotaxanes. Moreover, the length of glycol chains affects the extra π-stacking intercomponent interactions between the phenyl groups and the dimethoxy phenyl groups on the thread. Dynamic combinatorial library has shown at best 84% distribution of anthracene-threaded phenanthroline-based rotaxane, coinciding with the crystallography in that the additional π-stacking intercomponent interactions could increase the thermodynamic stability and selectivity of the rotaxanes.
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Affiliation(s)
- Sing-Ming Chan
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, The Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China; (S.-M.C.); (F.-K.T.); (C.-Y.L.); (C.-S.K.)
| | - Fung-Kit Tang
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, The Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China; (S.-M.C.); (F.-K.T.); (C.-Y.L.); (C.-S.K.)
| | - Ching-Yau Lam
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, The Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China; (S.-M.C.); (F.-K.T.); (C.-Y.L.); (C.-S.K.)
| | - Chak-Shing Kwan
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, The Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China; (S.-M.C.); (F.-K.T.); (C.-Y.L.); (C.-S.K.)
| | - Sam C. K. Hau
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China
| | - Ken Cham-Fai Leung
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, The Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China; (S.-M.C.); (F.-K.T.); (C.-Y.L.); (C.-S.K.)
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14
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Bazzoni M, Andreoni L, Silvi S, Credi A, Cera G, Secchi A, Arduini A. Selective access to constitutionally identical, orientationally isomeric calix[6]arene-based [3]rotaxanes by an active template approach. Chem Sci 2021; 12:6419-6428. [PMID: 34084442 PMCID: PMC8115267 DOI: 10.1039/d1sc00279a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Tris(phenylureido)calix[6]arene is endowed with unique properties that make it a valuable macrocyclic component for the synthesis of mechanically interlocked molecules. Its three-dimensional and intrinsically nonsymmetric structure is kinetically selective toward two processes: (i) in apolar media, the threading of bipyridinium based axle-like components takes place exclusively from the upper rim; (ii) SN2 alkylation reactions of a pyridylpyridinium precursor engulfed in the cavity occur selectively at pyridylpyridinium nitrogen atom located at the macrocycle upper rim (active template synthesis). Here we exploit such properties to prepare two series of [3]rotaxanes, each consisting of three sequence isomers that arise from the threading of two identical but nonsymmetric wheels on a symmetric thread differing only for the reciprocal orientation of the macrocycles. The features of the calix[6]arene and the active template synthetic approach, together with a careful selection of the precursors, enabled us to selectively synthesise the [3]rotaxane sequence isomers of each series with fast kinetics and high yields. Expedient access to a series of spatially controlled oriented [3]rotaxane isomers via a metal-free active template approach.![]()
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Affiliation(s)
- Margherita Bazzoni
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma Parco Area delle Scienze 17/A I-43124 Parma Italy
| | - Leonardo Andreoni
- Dipartimento di Chimica "G. Ciamician", Università di Bologna Via Selmi 2 I-40126 Bologna Italy
| | - Serena Silvi
- Dipartimento di Chimica "G. Ciamician", Università di Bologna Via Selmi 2 I-40126 Bologna Italy
| | - Alberto Credi
- Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche Via Gobetti 101 I-40129 Bologna Italy.,Dipartimento di Chimica Industriale "Toso Montanari", Università di Bologna Viale del Risorgimento 4 I-40136 Bologna Italy
| | - Gianpiero Cera
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma Parco Area delle Scienze 17/A I-43124 Parma Italy
| | - Andrea Secchi
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma Parco Area delle Scienze 17/A I-43124 Parma Italy
| | - Arturo Arduini
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma Parco Area delle Scienze 17/A I-43124 Parma Italy
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15
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Jerome P, Haribabu J, Bhuvanesh NSP, Karvembu R. Pd(II)‐NNN Pincer Complexes for Catalyzing Transfer Hydrogenation of Ketones. ChemistrySelect 2020. [DOI: 10.1002/slct.202003634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peter Jerome
- Department of Chemistry National Institute of Technology Tiruchirappalli 620015 India
| | - Jebiti Haribabu
- Department of Chemistry National Institute of Technology Tiruchirappalli 620015 India
| | | | - Ramasamy Karvembu
- Department of Chemistry National Institute of Technology Tiruchirappalli 620015 India
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16
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A Track-Based Molecular Synthesizer that Builds a Single-Sequence Oligomer through Iterative Carbon-Carbon Bond Formation. Chem 2020. [DOI: 10.1016/j.chempr.2020.09.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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17
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Hoyas Pérez N, Lewis JEM. Synthetic strategies towards mechanically interlocked oligomers and polymers. Org Biomol Chem 2020; 18:6757-6780. [PMID: 32840554 DOI: 10.1039/d0ob01583k] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Mechanically interlocked molecules have fascinated chemists for decades. Initially a tantalising synthetic challenge, interlocked molecules have continued to capture the imagination for their aesthetics and, increasingly, for their potential as molecular machines and use in materials applications. Whilst preliminary statistical attempts to prepare these molecules were exceedingly inefficient, a raft of template-directed strategies have now been realised, providing a vast toolbox from which chemists can access interlocked structures in excellent yields. For many envisaged applications it is desirable to move away from small, discrete interlocked molecules and turn to oligomers and polymers instead, either due to the need for multiple mechanical bonds within the desired material, or to exploit an extended scaffold for the organisation and arrangement of individual mechanically interlocked units. In this tutorial-style review we outline the synthetic strategies that have been employed for the synthesis of mechanically interlocked oligomers and polymers, including oligo-/polymerisation of (pseudo)interlocked precursors, metal-organic self-assembly, the use of orthogonal template motifs, iterative approaches and grafting onto polymer backbones.
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Affiliation(s)
- Nadia Hoyas Pérez
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 80 Wood Lane, London W12 0BZ, UK.
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18
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Tian C, Fielden SDP, Pérez-Saavedra B, Vitorica-Yrezabal IJ, Leigh DA. Single-Step Enantioselective Synthesis of Mechanically Planar Chiral [2]Rotaxanes Using a Chiral Leaving Group Strategy. J Am Chem Soc 2020; 142:9803-9808. [PMID: 32356978 PMCID: PMC7266371 DOI: 10.1021/jacs.0c03447] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
![]()
We report a one-step
enantioselective synthesis of mechanically
planar chiral [2]rotaxanes. Previous studies of such molecules have
generally involved the separation of enantiomers from racemic mixtures
or the preparation and separation of diastereomeric intermediates
followed by post-assembly modification to remove other sources of
chirality. Here, we demonstrate a simple asymmetric metal-free active
template rotaxane synthesis using a primary amine, an activated ester
with a chiral leaving group, and an achiral crown ether lacking rotational
symmetry. Mechanically planar chiral rotaxanes are obtained directly
in up to 50% enantiomeric excess. The rotaxanes were characterized
by NMR spectroscopy, high-resolution mass spectrometry, chiral HPLC,
single crystal X-ray diffraction, and circular dichroism. Either rotaxane
enantiomer could be prepared selectively by incorporating pseudoenantiomeric
cinchona alkaloids into the chiral leaving group.
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Affiliation(s)
- Chong Tian
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Stephen D P Fielden
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Borja Pérez-Saavedra
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | | | - David A Leigh
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.,School of Chemistry and Molecular Engineering, East China Normal University, 200062 Shanghai, China
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19
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Au-Yeung HY, Ng AWH. Mechanical Interlocking of Macrocycles in Different Sequences. Synlett 2020. [DOI: 10.1055/s-0039-1691573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Sequence isomerism is fundamental to the storage, transfer and expression of information in (bio)macromolecules and artificial polymers. Realization of sequence-specific properties in mechanically bonded molecules is extremely challenging due to the huge synthetic difficulty in the precise and controllable non-covalent interlocking of constitutionally different macrocycles in specific orders within a rotaxane or catenane. This Synpacts article highlights how sequence isomers of multicomponent rotaxanes and catenanes can be obtained by novel synthetic strategies and careful building block design.
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20
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Zhang Z, Tizzard GJ, Williams JAG, Goldup SM. Rotaxane Pt II-complexes: mechanical bonding for chemically robust luminophores and stimuli responsive behaviour. Chem Sci 2020; 11:1839-1847. [PMID: 34123277 PMCID: PMC8148368 DOI: 10.1039/c9sc05507j] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report an approach to rotaxanes in which the metal ion of a cyclometallated PtII luminophore is embedded in the space created by the mechanical bond. Our results show that the interlocked ligand environment stabilises a normally labile PtII–triazole bond against displacement by competing ligands and that the crowded environment of the mechanical bond retards oxidation of the PtII centre, without perturbing the photophysical properties of the complex. When an additional pyridyl binding site is included in the axle, the luminescence of the PtII centre is quenched, an effect that can be selectively reversed by the binding of AgI. Our results suggest that readily available interlocked metal-based phosphors can be designed to be stimuli responsive and have advantages as stabilised triplet harvesting dopants for device applications. We report an approach to interlocked PtII luminophores in which the mechanical bond stabilises the coordination environment of the embedded metal ion.![]()
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Affiliation(s)
- Zhihui Zhang
- Chemistry, University of Southampton Southampton SO51 5PG UK
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21
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Ye Z, Wang J, Kothapalli SSK, Yang Z, Chen L, Xu W, Cai Y, Zhang T, Xiao X, Deng P, Feng W, Yuan L. Controlling the selective synthesis of [2]- and [3]rotaxanes by intermolecular steric hindrance between the macrocyclic hosts. Chem Commun (Camb) 2019; 56:1066-1069. [PMID: 31872194 DOI: 10.1039/c9cc08253k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Two hydrogen-bonded azo-macrocycles with little disparity of the side chains in steric hindrance exhibited a substantial difference in complexation (slow/fast exchange) towards bipyridinium. Inspired by this finding, these macrocycles were applied to efficiently and selectively construct [2]- and [3]rotaxanes through one-pot synthesis. The origin of the selectivity in this novel approach was elucidated by comparing single crystal structures, DFT calculations and stepwise synthesis.
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Affiliation(s)
- Zecong Ye
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Jian Wang
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Sudarshana Santhosh Kumar Kothapalli
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Zhiyao Yang
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Lixi Chen
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Weitao Xu
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
| | - Yimin Cai
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Tinghui Zhang
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Xin Xiao
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
| | - Pengchi Deng
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Wen Feng
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
| | - Lihua Yuan
- College of Chemistry, Key Laboratory for Radiation Physics and Technology of Ministry of Education, Analytical & Testing Center, Sichuan University, Chengdu 610064, Sichuan, China.
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22
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Ng AWH, Yee C, Au‐Yeung HY. Radial Hetero[5]catenanes: Peripheral Isomer Sequences of the Interlocked Macrocycles. Angew Chem Int Ed Engl 2019; 58:17375-17382. [DOI: 10.1002/anie.201908576] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 09/05/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Antony Wing Hung Ng
- Department of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Chi‐Chung Yee
- Department of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Ho Yu Au‐Yeung
- Department of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
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23
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Ng AWH, Yee C, Au‐Yeung HY. Radial Hetero[5]catenanes: Peripheral Isomer Sequences of the Interlocked Macrocycles. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908576] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Antony Wing Hung Ng
- Department of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Chi‐Chung Yee
- Department of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
| | - Ho Yu Au‐Yeung
- Department of ChemistryThe University of Hong Kong Pokfulam Road Hong Kong P. R. China
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24
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Jerome P, Arafath SY, Haribabu J, Bhuvanesh NSP, Karvembu R. Effect of 2-Bromopyridine Ancillary Ligand in the Catalysis of Pd(II)-NNN Pincer Complexes towards Suzuki-Miyaura Cross-Coupling Reaction. ChemistrySelect 2019. [DOI: 10.1002/slct.201803893] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peter Jerome
- Department of Chemistry; National Institute of Technology; Tiruchirappalli 620015 India
| | | | - Jebiti Haribabu
- Department of Chemistry; National Institute of Technology; Tiruchirappalli 620015 India
| | | | - Ramasamy Karvembu
- Department of Chemistry; National Institute of Technology; Tiruchirappalli 620015 India
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25
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Abstract
Heterorotaxanes, in which at least two types of macrocycles were introduced as the wheel components in rotaxanes, have attracted more and more attention during the past few decades owing to their unique structural features and intriguing properties. The coexistence of varied macrocycles endows the resultant heterorotaxanes not only versatile shuttling and switching behaviors but also great potential for the construction of functional rotaxane systems for applications. In this feature article, a survey of the successful synthesis of heterorotaxanes will be provided based on the various strategies towards the synthesis of heterorotaxanes, i.e. orthogonal binding approach, self-sorting approach, cooperative capture approach, active metal template approach, etc.
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Affiliation(s)
- Xu-Qing Wang
- School of Chemistry and Molecular Engineering, East China Normal University, 3663 N. Zhongshan Road, Shanghai, China.
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26
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Gaeta C, Talotta C, Neri P. Calix[6]arene-based atropoisomeric pseudo[2]rotaxanes. Beilstein J Org Chem 2018; 14:2112-2124. [PMID: 30202465 PMCID: PMC6122310 DOI: 10.3762/bjoc.14.186] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 07/26/2018] [Indexed: 12/27/2022] Open
Abstract
Some examples of atropoisomeric pseudorotaxanes in which the isomerism arises by the different conformations adopted by the wheel are reported here. Upon threading hexahexyloxycalix[6]arene 1 with ammonium axles 2+ or 3+, bearing biphenyl or trifluoromethylbenzyl moieties, respectively, two atropoisomeric pseudorotaxanes were formed in which the calix[6]-wheel 1 adopts the 1,2,3-alternate and cone conformations. The interconversion between them cannot be obtained by simple rotation around the ArCH2Ar bonds of the calixarene wheel, which is blocked by the presence of the axle inside its cavity. Therefore, it can only be obtained through a mechanism of de-threading/re-threading of the axle. In all the examined cases, the 1,2,3-alternate and cone atropoisomers are, respectively, the kinetic and the thermodynamic ones.
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Affiliation(s)
- Carmine Gaeta
- Dipartimento di Chimica e Biologia " A. Zambelli", Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
| | - Carmen Talotta
- Dipartimento di Chimica e Biologia " A. Zambelli", Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
| | - Placido Neri
- Dipartimento di Chimica e Biologia " A. Zambelli", Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
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27
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Fujino T, Naitoh H, Miyagawa S, Kimura M, Kawasaki T, Yoshida K, Inoue H, Takagawa H, Tokunaga Y. Formation of [2]- and [3]Rotaxanes through Bridging under Kinetic and Thermodynamic Control. Org Lett 2018; 20:369-372. [PMID: 29283267 DOI: 10.1021/acs.orglett.7b03615] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient synthesis of a doubly stranded [3]rotaxane has been developed through bridging of a pseudo[3]rotaxane featuring two axle components. Reversible azine formation was effective as the bridging reaction. Kinetic and thermodynamic conditions provided the [2]- and [3]rotaxanes, respectively.
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Affiliation(s)
- Takaaki Fujino
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui , Bunkyo, Fukui 910-8507, Japan
| | - Hirotake Naitoh
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui , Bunkyo, Fukui 910-8507, Japan
| | - Shinobu Miyagawa
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui , Bunkyo, Fukui 910-8507, Japan
| | - Masaki Kimura
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui , Bunkyo, Fukui 910-8507, Japan
| | - Tsuneomi Kawasaki
- Department of Applied Chemistry, Tokyo University of Science , Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Kazuyuki Yoshida
- Forensic Science Laboratory, Fukui Prefectural Police Headquarters , Ohte, Fukui 910-8515, Japan
| | - Hajime Inoue
- Forensic Science Laboratory, Fukui Prefectural Police Headquarters , Ohte, Fukui 910-8515, Japan
| | - Hiroaki Takagawa
- Forensic Science Laboratory, Fukui Prefectural Police Headquarters , Ohte, Fukui 910-8515, Japan
| | - Yuji Tokunaga
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui , Bunkyo, Fukui 910-8507, Japan
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28
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Lewis JEM, Galli M, Goldup SM. Properties and emerging applications of mechanically interlocked ligands. Chem Commun (Camb) 2017; 53:298-312. [PMID: 27819362 DOI: 10.1039/c6cc07377h] [Citation(s) in RCA: 131] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mechanically interlocked molecules have a long and rich history as ligands thanks to the key role coordination chemistry has played in the development of high yielding passive template syntheses of rotaxanes and catenanes. In this Feature Article, we highlight the effect of the mechanical bond on the properties of metal ions bound within the sterically hindered environment of the macrocycle cavity, and discuss the emerging applications of interlocked ligands in catalysis, sensing and supramolecular materials.
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Affiliation(s)
- James E M Lewis
- Chemistry, University of Southampton, University Road, Southampton, SO17 1BJ, UK.
| | - Marzia Galli
- Chemistry, University of Southampton, University Road, Southampton, SO17 1BJ, UK.
| | - Stephen M Goldup
- Chemistry, University of Southampton, University Road, Southampton, SO17 1BJ, UK.
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29
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Evans NH, Akien GR. Rapid and simultaneous synthesis of a hydrogen bond templated [3]rotaxane and its related [2]rotaxane molecular shuttle. Supramol Chem 2017. [DOI: 10.1080/10610278.2017.1400031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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La Manna P, Talotta C, Gaeta C, Soriente A, De Rosa M, Neri P. Threading of an Inherently Directional Calixarene Wheel with Oriented Ammonium Axles. J Org Chem 2017; 82:8973-8983. [PMID: 28799754 DOI: 10.1021/acs.joc.7b01388] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The threading of monostoppered alkylbenzylammonium axles 7+ and 8+ with the calix[6]-wheel 3 can occur by both routes of entering the macrocycle 3 in the cone conformation: passage through the upper rim and the through the lower rim. Thus, under thermodynamic conditions, with both the axles 7+ and 8+, the two possible orientations of calix[2]pseudorotaxane, namely, endo-benzyl and endo-alkyl, are formed by a stereoselectivity controlled by the endo-alkyl rule. Interestingly, by 1H NMR monitoring of the threading process between 8+ and 3, we revealed two calix[2]pseudorotaxane isomers in which the calix-wheel adopts 1,2,3-alternate and cone conformations, which represent the kinetic and thermodynamic species, respectively. Finally, the synthesis of ammonium-based oriented calix[2]rotaxane is here described.
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Affiliation(s)
- Pellegrino La Manna
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Carmen Talotta
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Carmine Gaeta
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Annunziata Soriente
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Margherita De Rosa
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Placido Neri
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
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31
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Ahamed BN, Van Velthem P, Robeyns K, Fustin CA. Influence of a Single Catenane on the Solid-State Properties of Mechanically Linked Polymers. ACS Macro Lett 2017; 6:468-472. [PMID: 35610870 DOI: 10.1021/acsmacrolett.7b00204] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report on mechanically linked polymers containing a single catenane in the middle of the chain. These polymers were synthesized by a simple procedure consisting in "clicking" polymer chains onto a functionalized palladium-templated [2]catenane, allowing the preparation of a variety of mechanically linked polymers. The flexibility of the catenane junction was modulated by removing the Pd ion from the catenane to unlock the macrocycles and increase their mobility. We show that this mobility change has a strong impact on the solid-state properties of the polymers. This is illustrated by studying the glass transition temperature of polystyrene-based polymers and the crystallization behavior of poly(ethylene oxide)-based polymers. Our study proves that a change of flexibility of a single catenane inserted into a polymer chain drastically influences the polymer behavior in the solid state.
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Affiliation(s)
- B. Nisar Ahamed
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft
Matter Division (BSMA), and ‡Institute of Condensed Matter and Nanosciences (IMCN),
Molecules Structure and Reactivity Division (MOST), Université catholique de Louvain, Place Pasteur
1, 1348, Louvain-la-Neuve, Belgium
| | - Pascal Van Velthem
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft
Matter Division (BSMA), and ‡Institute of Condensed Matter and Nanosciences (IMCN),
Molecules Structure and Reactivity Division (MOST), Université catholique de Louvain, Place Pasteur
1, 1348, Louvain-la-Neuve, Belgium
| | - Koen Robeyns
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft
Matter Division (BSMA), and ‡Institute of Condensed Matter and Nanosciences (IMCN),
Molecules Structure and Reactivity Division (MOST), Université catholique de Louvain, Place Pasteur
1, 1348, Louvain-la-Neuve, Belgium
| | - Charles-André Fustin
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft
Matter Division (BSMA), and ‡Institute of Condensed Matter and Nanosciences (IMCN),
Molecules Structure and Reactivity Division (MOST), Université catholique de Louvain, Place Pasteur
1, 1348, Louvain-la-Neuve, Belgium
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32
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Lewis JEM, Winn J, Goldup SM. Stepwise, Protecting Group Free Synthesis of [4]Rotaxanes. Molecules 2017; 22:E89. [PMID: 28075366 PMCID: PMC6155830 DOI: 10.3390/molecules22010089] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 12/22/2016] [Accepted: 12/25/2016] [Indexed: 11/16/2022] Open
Abstract
Despite significant advances in the last three decades towards high yielding syntheses of rotaxanes, the preparation of systems constructed from more than two components remains a challenge. Herein we build upon our previous report of an active template copper-catalyzed azide-alkyne cycloaddition (CuAAC) rotaxane synthesis with a diyne in which, following the formation of the first mechanical bond, the steric bulk of the macrocycle tempers the reactivity of the second alkyne unit. We have now extended this approach to the use of 1,3,5-triethynylbenzene in order to successively prepare [2]-, [3]- and [4]rotaxanes without the need for protecting group chemistry. Whilst the first two iterations proceeded in good yield, the steric shielding that affords this selectivity also significantly reduces the efficacy of the active template (AT)-CuAAC reaction of the third alkyne towards the preparation of [4]rotaxanes, resulting in severely diminished yields.
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Affiliation(s)
- James E M Lewis
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK.
| | - Joby Winn
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK.
| | - Stephen M Goldup
- Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK.
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33
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Wang HX, Hu SZ, Shi Q, Chen CF. Complexation between a triptycene-derived oxacalixarene and π-extended viologens: linker-length-dependent orientation of the macrocycles in pseudo[3]rotaxanes. Org Biomol Chem 2016; 14:10481-10488. [PMID: 27761549 DOI: 10.1039/c6ob02093c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With an expanded electron-rich cavity and a fixed conformation, macrocycle H was found to encapsulate π-extended viologens G1-G4 to form the first case of pseudo[3]rotaxanes based on oxacalixarenes. The complexation was investigated in detail both in solution and in the solid state using NMR spectroscopy and X-ray crystallography. Due to the three-dimensional nonsymmetric structure of H, three orientational isomers of the pseudorotaxanes could be expected theoretically. However, as the crystal structure analysis revealed, only one of the three isomers was obtained with either G1 or G3. Moreover, with regard to the different lengths of the linkers in the guest molecules, completely opposite orientations of the macrocycles on the axles were observed, which could be explained by different complexation modes between the components in the pseudo[3]rotaxanes. Additionally, the complexation between the host and the guest could be reversibly switched on and off using a suitable acid and base. These results will provide us with the opportunity to design and elaborately regulate high-order molecular devices.
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Affiliation(s)
- Han-Xiao Wang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shu-Zhen Hu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Qiang Shi
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chuan-Feng Chen
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
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34
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Lewis JEM, Winn J, Cera L, Goldup SM. Iterative Synthesis of Oligo[n]rotaxanes in Excellent Yield. J Am Chem Soc 2016; 138:16329-16336. [PMID: 27700073 DOI: 10.1021/jacs.6b08958] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We present an operationally simple iterative coupling strategy for the synthesis of oligomeric homo- and hetero[n]rotaxanes with precise control over the position of each macrocycle. The exceptional yield of the AT-CuAAC reaction, combined with optimized conditions that allow the rapid synthesis of the target oligomers, opens the door to the study of precision-engineered oligomeric interlocked molecules.
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Affiliation(s)
- James E M Lewis
- Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, U.K
| | - Joby Winn
- School of Biological Sciences, Queen Mary University of London , London E1 4NS, U.K
| | - Luca Cera
- School of Biological Sciences, Queen Mary University of London , London E1 4NS, U.K
| | - Stephen M Goldup
- Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, U.K
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35
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Neal EA, Goldup SM. A Kinetic Self-Sorting Approach to Heterocircuit [3]Rotaxanes. Angew Chem Int Ed Engl 2016; 55:12488-93. [PMID: 27600208 PMCID: PMC5113769 DOI: 10.1002/anie.201606640] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Indexed: 11/24/2022]
Abstract
In this proof-of-concept study, an active-template coupling is used to demonstrate a novel kinetic self-sorting process. This process iteratively increases the yield of the target heterocircuit [3]rotaxane product at the expense of other threaded species.
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Affiliation(s)
- Edward A Neal
- School of Biological and Chemical Sciences, Queen Mary University of London, UK
| | - Stephen M Goldup
- School of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.
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36
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Neal EA, Goldup SM. A Kinetic Self-Sorting Approach to Heterocircuit [3]Rotaxanes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606640] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Edward A. Neal
- School of Biological and Chemical Sciences; Queen Mary University of London; UK
| | - Stephen M. Goldup
- School of Chemistry; University of Southampton; Highfield Southampton SO17 1BJ UK
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37
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Nisar Ahamed B, Duchêne R, Robeyns K, Fustin CA. Catenane-based mechanically-linked block copolymers. Chem Commun (Camb) 2016; 52:2149-52. [PMID: 26699198 DOI: 10.1039/c5cc09775d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
An original strategy for the synthesis of diblock copolymers where the blocks are linked by a catenane junction is described. Starting from a functionalized catenane precursor, our strategy enables the preparation of a variety of copolymers by different techniques such as ROP, ATRP and CuAAC click reaction.
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Affiliation(s)
- B Nisar Ahamed
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter division (BSMA), Université catholique de Louvain, Place Pasteur 1, 1348, Louvain-la-Neuve, Belgium.
| | - Roland Duchêne
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter division (BSMA), Université catholique de Louvain, Place Pasteur 1, 1348, Louvain-la-Neuve, Belgium.
| | - Koen Robeyns
- IMCN, Molecules Solids and Reactivity division (MOST), Université catholique de Louvain, Place Pasteur 1, 1348, Louvain-la-Neuve, Belgium
| | - Charles-André Fustin
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter division (BSMA), Université catholique de Louvain, Place Pasteur 1, 1348, Louvain-la-Neuve, Belgium.
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38
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Benson CR, Share AI, Marzo MG, Flood AH. Double Switching of Two Rings in Palindromic [3]Pseudorotaxanes: Cooperativity and Mechanism of Motion. Inorg Chem 2016; 55:3767-76. [DOI: 10.1021/acs.inorgchem.5b02554] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Christopher R. Benson
- Department
of Chemistry, Indiana University 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Andrew I. Share
- Department
of Chemistry, Indiana University 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Matthew G. Marzo
- Department
of Chemistry, Indiana University 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Amar H. Flood
- Department
of Chemistry, Indiana University 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
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39
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Cakmak Y, Erbas-Cakmak S, Leigh DA. Asymmetric Catalysis with a Mechanically Point-Chiral Rotaxane. J Am Chem Soc 2016; 138:1749-51. [PMID: 26835978 PMCID: PMC4805306 DOI: 10.1021/jacs.6b00303] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
![]()
Mechanical
point-chirality in a [2]rotaxane is utilized for asymmetric
catalysis. Stable enantiomers of the rotaxane result from a bulky
group in the middle of the thread preventing a benzylic amide macrocycle
shuttling between different sides of a prochiral center, creating
point chirality in the vicinity of a secondary amine group. The resulting
mechanochirogenesis delivers enantioselective organocatalysis via
both enamine (up to 71:29 er) and iminium (up to 68:32 er) activation
modes.
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Affiliation(s)
- Yusuf Cakmak
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Sundus Erbas-Cakmak
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - David A Leigh
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
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40
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Hayashi R, Slavík P, Mutoh Y, Kasama T, Saito S. Sequence-Selective Synthesis of Rotacatenane Isomers. J Org Chem 2016; 81:1175-84. [DOI: 10.1021/acs.joc.5b02697] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Ryuto Hayashi
- Department
of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan
| | - Petr Slavík
- Department
of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan
| | - Yuichiro Mutoh
- Department
of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan
| | - Takeshi Kasama
- Research
Center for Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo, Tokyo, 113-8510, Japan
| | - Shinichi Saito
- Department
of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan
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41
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Oprea S, Potolinca VO, Varganici CD. Synthesis and properties of polyurethane urea with pyridine-2,6-dicarboxamide moieties in their structure. RSC Adv 2016. [DOI: 10.1039/c6ra23660j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The inclusion of 2,6-pyridinedicarboxamide into polyurethanes structure strongly influenced their morphology, surface and thermo-mechanical properties. The 2,6-pyridinedicarboxamide units adopt syn-syn conformations into polyurethane matrix.
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Affiliation(s)
- S. Oprea
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi
- Romania
| | - V. O. Potolinca
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi
- Romania
| | - C.-D. Varganici
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi
- Romania
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42
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Ju H, Clegg JK, Park KM, Lindoy LF, Lee SS. Formation of a Dicopper Platform Based Polyrotaxane Whose "String" and "Bead" Are Constructed from the Same Components. J Am Chem Soc 2015; 137:9535-8. [PMID: 26185900 DOI: 10.1021/jacs.5b05770] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The combination of the dicopper platform [Cu2(L)2(THF)2] (1·2THF), where H2L is 1,1'-(1,3-phenylene)-bis-4,4-dimethylpentane-1,3-dione, and 1,4-bis(4-pyridyl)piperazine (bpp), afforded the first example of a one-dimensional polyrotaxane {[(1)(μ2-bpp)][(1)2(bpp)2]}n whose "string" and "bead" are constructed from the same components. The bead of stoichiometry [(1)2(bpp)2] has a large rectangular cavity of dimensions 7.40 × 15.64 Å and is threaded onto a stair-like string of composition [(1)(μ2-bpp)]n. The formation of the polyrotaxane is driven by π-π stacking between the string and the beads with precise electronic and steric complementarity between these components. A pathway for the formation of the polyrotaxane is proposed.
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Affiliation(s)
- Huiyeong Ju
- †Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, S. Korea
| | - Jack K Clegg
- ‡School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Ki-Min Park
- †Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, S. Korea
| | - Leonard F Lindoy
- †Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, S. Korea.,§School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Shim Sung Lee
- †Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, S. Korea
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43
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Hayashi R, Mutoh Y, Kasama T, Saito S. Synthesis of [3]Rotaxanes by the Combination of Copper-Mediated Coupling Reaction and Metal-Template Approach. J Org Chem 2015; 80:7536-46. [PMID: 26161508 DOI: 10.1021/acs.joc.5b01120] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
[3]Rotaxanes with two axle components and one ring component were synthesized by the combination of a coupling reaction using a transition-metal catalyst and a metal-template approach. Thus, [2]rotaxanes were prepared by the oxidative dimerization of alkyne promoted by macrocyclic phenanthroline-CuI complexes. The [2]rotaxane was reacted with a Cu(I) salt and an acyclic ligand to generate a tetrahedral Cu(I) complex. Metal-free [3]rotaxane was isolated by the end-capping reaction of the acyclic ligand, followed by the removal of Cu(I) ion. The stability of the tetrahedral Cu(I) complexes depended on the size of both the ring component and the acyclic ligand, which was correlated with the yield of the corresponding [3]rotaxane.
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Affiliation(s)
- Ryuto Hayashi
- †Department of Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - Yuichiro Mutoh
- †Department of Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
| | - Takeshi Kasama
- ‡Research Center for Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Shinichi Saito
- †Department of Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
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44
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Wilson EA, Vermeulen NA, McGonigal PR, Avestro AJ, Sarjeant AA, Stern CL, Stoddart JF. Formation of a hetero[3]rotaxane by a dynamic component-swapping strategy. Chem Commun (Camb) 2015; 50:9665-8. [PMID: 25019588 DOI: 10.1039/c4cc03612c] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Acid-catalysed scrambling of the mechanically interlocked components between two different homo[3]rotaxanes, constituted of dumbbells containing two secondary dialkylammonium ion recognition sites encircled by two [24]crown-8 rings, each containing a couple of imine bonds, affords a statistical mixture of a hetero[3]rotaxane along with the two homo[3]rotaxanes, indicating that neither selectivity nor cooperativity is operating during the assembly process.
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Affiliation(s)
- Eleanor A Wilson
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113, USA.
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45
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Burgess MG, Zafar MN, Horner ST, Clark GR, Wright LJ. Controlled translocation of palladium(II) within a 22 ring atom macrocyclic ligand. Dalton Trans 2015; 43:17006-16. [PMID: 24869561 DOI: 10.1039/c4dt00765d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Double aza-Michael addition of n-butylamine to the two acrylamide groups of acyclic N(2),N(6)-bis(6-acrylamidopyridin-2-yl)pyridine-2,6-dicarboxamide gives the corresponding macrocycle, H₄L. H₄L has potential coordination pockets associated with the 2,6-dicarboxamide (head) and the butylamine (tail) regions of the macrocycle. Depending on the conditions employed, macrocyclic complexes with palladium(II) coordinated to either the tail or the head of the macrocycle can be isolated. Thus, treatment of H₄L with [PdCl2(NCPh)2] and sodium acetate, or [Pd(OAc)2] gives the closely related "tail-coordinated" complexes [PdCl(H3L)] (3a) or [Pd(OAc)(H3L)] (3b), respectively. However, employment of the bases 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or pyridine during the treatment of H₄L with [Pd(OAc)2] results in the "head-coordinated" complexes [Pd(NH2R)(H2L)] (NH2R = N-(3-aminopropyl)caprolactam, which is formed by hydrolysis of DBU) (5) or [Pd(OH2)(H2L)] (6), respectively. Translocation of the palladium ion from the macrocycle tail in 3b to the head occurs on treatment with either DBU or N-(3-aminopropyl)caprolactam. In both cases the product 5 is formed. The aqua ligand in 6 is labile and easily displaced by the N-donor ligands n-butylamine, N-(3-aminopropyl)caprolactam or DBU to give the corresponding complexes [Pd(NH2(n)Bu)(H2L)] (4), (5), or [Pd(DBU)(H2L)] (7). The data suggest that hydrolysis of DBU to produce the N-(3-aminopropyl)caprolactam ligand in 5 is catalysed by the acetic acid formed during ligand metallation rather than by coordination to palladium. The X-ray crystal structures of H₄L, 5, and 6 are reported.
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Affiliation(s)
- Michael G Burgess
- School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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46
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Xue M, Yang Y, Chi X, Yan X, Huang F. Development of Pseudorotaxanes and Rotaxanes: From Synthesis to Stimuli-Responsive Motions to Applications. Chem Rev 2015; 115:7398-501. [DOI: 10.1021/cr5005869] [Citation(s) in RCA: 605] [Impact Index Per Article: 67.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Min Xue
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Yong Yang
- Department
of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, People’s Republic of China
| | - Xiaodong Chi
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Xuzhou Yan
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Feihe Huang
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
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47
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Cao ZQ, Li H, Yao J, Zou L, Qu DH, Tian H. A Perylene-Bridged Switchable [3]Rotaxane Molecular Shuttle with a Fluorescence Output. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201402201] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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48
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49
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Beves JE, Blanco V, Blight BA, Carrillo R, D'Souza DM, Howgego D, Leigh DA, Slawin AMZ, Symes MD. Toward metal complexes that can directionally walk along tracks: controlled stepping of a molecular biped with a palladium(II) foot. J Am Chem Soc 2014; 136:2094-100. [PMID: 24446768 DOI: 10.1021/ja4123973] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We report on the design, synthesis, and operation of a bimetallic molecular biped on a three-foothold track. The "walker" features a palladium(II) complex "foot" that can be selectively stepped between 4-dimethylaminopyridine and pyridine ligand sites on the track via reversible protonation while the walker remains attached to the track throughout by means of a kinetically inert platinum(II) complex foot. The substitution pattern of the three ligand binding sites, together with the kinetic stability of the metal-ligand coordination bonds, affords the two positional isomers a high degree of metastability, meaning that altering the chemical state of the track does not automatically instigate stepping in the absence of an additional stimulus (heat in the presence of a coordinating solvent). The use of metastable metal complexes for foot-track interactions offers a promising alternative to dynamic covalent chemistry for the design of small-molecule synthetic molecular walkers.
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Affiliation(s)
- Jonathon E Beves
- School of Chemistry, University of Edinburgh , The King's Buildings, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
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50
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Neal EA, Goldup SM. Chemical consequences of mechanical bonding in catenanes and rotaxanes: isomerism, modification, catalysis and molecular machines for synthesis. Chem Commun (Camb) 2014; 50:5128-42. [DOI: 10.1039/c3cc47842d] [Citation(s) in RCA: 207] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We highlight some of the less discussed consequences of mechanical bonding for the chemical behaviour of catenanes and rotaxanes, including striking recent examples where molecular motion controls chemical reactions.
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Affiliation(s)
- Edward A. Neal
- School of Biological and Chemical Science
- Queen Mary University of London
- London, UK
| | - Stephen M. Goldup
- School of Biological and Chemical Science
- Queen Mary University of London
- London, UK
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