1
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Jaiswal M, Dasgupta S. Tuning Stopper Size in Multiresponsive [2]Rotaxanes for Fluoride Anion Selective Metastability. Org Lett 2024; 26:6776-6781. [PMID: 39053506 DOI: 10.1021/acs.orglett.4c02544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
[23]Crown-7-ether incorporated [2]rotaxanes, comprising an anthracene blocker and 4-isopropylphenyl/cyclohexyl end groups, exhibited varying degrees of metastability with a range of chemical (base, halide anions) and physical (solvent, heat) stimuli. Among halides, fluoride, chloride, and bromide anions affected the deslippage of 23-crown-7-ether in 4-isopropylphenyl stoppered [2]rotaxane. Surprisingly, only fluoride anions could selectively induce deslippage in cyclohexyl stoppered [2]rotaxane, whose fluorescence quenching provided an additional tool to selectively detect the fluoride anions down to 2.49 × 10-7 M.
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Affiliation(s)
- Mukesh Jaiswal
- Department of Chemistry, National Institute of Technology Patna, Patna 800005, India
| | - Suvankar Dasgupta
- Department of Chemistry, National Institute of Technology Patna, Patna 800005, India
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2
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Prakashni M, Dasgupta S. BP23C7: high-yield synthesis and application in constructing [3]rotaxanes and responsive pseudo[2]rotaxanes. Org Biomol Chem 2024; 22:1871-1884. [PMID: 38349013 DOI: 10.1039/d3ob02094k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
A biphenyl-23-crown-7 ether (BP23C7) is synthesized in 86% yield from commercially available starting materials. BP23C7 forms pseudo[2]rotaxane with a dibenzylammonium ion (DBA+), exhibiting a good association constant value (ka = 1 × 103 M-1). Subsequently, fluorophoric properties of BP23C7 and anthracene terminated axles are blended to create responsive pseudo[2]rotaxanes. The "turn-on" fluorescence response of BP23C7 due to the addition of fluoride and chloride anions to pseudo[2]rotaxane systems has been investigated. Concomitant fluorescence quenching of the anthracene moiety of corresponding axles due to ion-pair formation has been addressed. Furthermore, two variants of [23]crown ethers, i.e. BP23C7 and o-xylene-23-crown-7 ether (X23C7), are applied for constructing homo[3]rotaxane architectures. A half-axle comprising of DBA+ moiety and a terminal olefin is mixed separately with two [23]crown ethers and subjected to self-metathesis using Grubbs' first-generation catalyst.
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Affiliation(s)
- Manisha Prakashni
- Department of Chemistry, National Institute of Technology Patna, Patna - 800005, India.
| | - Suvankar Dasgupta
- Department of Chemistry, National Institute of Technology Patna, Patna - 800005, India.
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3
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Hertzog JE, Liu G, Rawe BW, Maddi VJ, Hart LF, Oh J, Dolinski ND, Rowan SJ. Balancing ring and stopper group size to control the stability of doubly threaded [3]rotaxanes. Org Biomol Chem 2023; 21:6969-6978. [PMID: 37581904 DOI: 10.1039/d3ob01123b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
Synthesizing doubly threaded [3]rotaxanes requires the use of larger rings than more traditional singly threaded [2]rotaxanes. A key challenge in accessing stable doubly threaded [3]rotaxanes with large rings is finding the right combination of ring to stopper size. In this study, a series of doubly threaded [3]rotaxanes derived from five different sized macrocycles in the size range of 40-48 atoms and two different stopper groups, which contain 1 or 2 tris(p-t-butylbiphenyl)methyl moieties, were prepared and their kinetic stability examined. These interlocked compounds were synthesized using a metal-templated approach and fully characterized utilizing a combination of mass spectrometry, NMR spectroscopy, and size-exclusion chromatography techniques. The effect of ring size on the stability of the doubly threaded [3]rotaxane was investigated via kinetic stability tests monitored using 1H-NMR spectroscopy. By tightening the macrocycle systematically every 2 atoms from 48 to 40 atoms, a wide range of doubly threaded interlocked molecules could be accessed in which the rate of room temperature slippage of the macrocycle from the dumbbells could be tuned. Using the larger stopper group with a 48-atom ring results in no observable rotaxane, 46-44 atom macrocycles result in metastable rotaxane species with a slippage half-life of ∼5 weeks and ∼9 weeks, respectively, while macrocycles of 42 atoms or smaller yield a stable rotaxane. The smaller sized stopper is not able to fully stabilize any of the [3]rotaxane structures but metastable [3]rotaxanes are obtained with slippage half-lives of 25 ± 2 hours and 13 ± 1 days using macrocycles with 42 or 40 atoms, respectively. These results highlight the dramatic effect that relatively small ring size changes can have on the structure of doubly threaded [3]rotaxanes and lay the synthetic groundwork for a range of higher order doubly threaded interlocked architectures.
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Affiliation(s)
- Jerald E Hertzog
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA.
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
| | - Guancen Liu
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA.
| | - Benjamin W Rawe
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
| | - Vincent J Maddi
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA.
| | - Laura F Hart
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
| | - Jongwon Oh
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
| | - Neil D Dolinski
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
| | - Stuart J Rowan
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA.
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
- Chemical Science and Engineering Division and Center for Molecular Engineering, Argonne National Laboratory, Lemont, IL 60434, USA
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4
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Prakashni M, Dasgupta S. Synthesis of [2]Rotaxane‐Based pH‐Responsive Molecular Switch Involving a [23]Crown Ether Wheel, Dibenzylammonium and Methyl Triazolium Recognition Stations. ChemistrySelect 2023. [DOI: 10.1002/slct.202300553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Affiliation(s)
- Manisha Prakashni
- Department of Chemistry National Institute of Technology Patna Ashok Rajpath Patna 800005 Bihar India
| | - Suvankar Dasgupta
- Department of Chemistry National Institute of Technology Patna Ashok Rajpath Patna 800005 Bihar India
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5
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Washino G, Soto MA, Wolff S, MacLachlan MJ. Preprogrammed assembly of supramolecular polymer networks via the controlled disassembly of a metastable rotaxane. Commun Chem 2022; 5:155. [PMID: 36698032 PMCID: PMC9814676 DOI: 10.1038/s42004-022-00774-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 11/08/2022] [Indexed: 11/24/2022] Open
Abstract
In our daily life, some of the most valuable commodities are preprogrammed or preassembled by a manufacturer; the end-user puts together the final product and gathers properties or function as desired. Here, we present a chemical approach to preassembled materials, namely supramolecular polymer networks (SPNs), which wait for an operator's command to organize autonomously. In this prototypical system, the controlled disassembly of a metastable interlocked molecule (rotaxane) liberates an active species to the medium. This species crosslinks a ring-containing polymer and assembles with a reporting macrocycle to produce colorful SPNs. We demonstrate that by using identical preprogrammed systems, one can access multiple supramolecular polymer networks with different degrees of fluidity (μ* = 2.5 to 624 Pa s-1) and color, all as desired by the end-user.
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Affiliation(s)
- Gosuke Washino
- grid.17091.3e0000 0001 2288 9830Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1 Canada
| | - Miguel A. Soto
- grid.17091.3e0000 0001 2288 9830Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1 Canada
| | - Siad Wolff
- grid.17091.3e0000 0001 2288 9830Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1 Canada
| | - Mark J. MacLachlan
- grid.17091.3e0000 0001 2288 9830Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1 Canada ,grid.17091.3e0000 0001 2288 9830Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC V6T 1Z4 Canada ,grid.17091.3e0000 0001 2288 9830Bioproducts Institute, University of British Columbia, 2385 East Mall, Vancouver, BC V6T 1Z4 Canada ,grid.9707.90000 0001 2308 3329WPI Nano Life Science Institute, Kanazawa University, Kanazawa, 920-1192 Japan
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6
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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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7
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Nyssen N, Ajami D, Ardelean A, Desroches F, Li J, Luhmer M, Reinaud O, Jabin I. Closing a Calix[6]arene-Based Funnel Zn 2+ Complex at Its Large Rim Entrance: Consequences on Metal Ion Affinity and Host-Guest Properties. J Org Chem 2021; 86:12075-12083. [PMID: 34409837 DOI: 10.1021/acs.joc.1c01418] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A molecular capsule based on a calix[6]arene core closed at the small rim by a three-point coordinated metal ion and at the large rim by a three-point covalent capping is described. It is derived from a trisimidazole funnel complex capped by a trenamide unit that prevents in/out exchange of guest molecules through the large rim. A detailed comparative study with three different calixarenes provides a unique opportunity for (i) comparing the binding ability of two different coordination sites in well three-dimensional (3D)-structured macrocyclic receptors and (ii) evaluating the impact of a covalent closing of one rim of a funnel receptor while the other rim is closed by weaker coordination bonds. Indeed, this study allowed for highlighting various interesting new features. It is first shown that the trenamide site can bind a metal ion such as Zn2+ by itself. This involves a 1:1 coordination of the metal ion to the three carbonyl groups of the amide functions, which undergo trans-to-cis isomerization and are partially embedded in the calix core. When the trisimidazole core is present, the Zn2+ ion preferentially binds at the small rim, thus closing the cavity. Guest ligand exchange must then occur through a decoordination/recoordination process of the metal ion. The modification and rigidification of the calixarene conformation induced by the large rim capping strengthen the metal ion coordination at the small rim. This also leads to a selective metallo-receptor that readily binds EtNH2 under conditions where PrNH2 is not recognized at all. The increased rigidity of the receptor, however, weakens the host-guest interactions, precluding important induced-fit behaviors that are at work in the parent, large rim opened, funnel complex.
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Affiliation(s)
- Nicolas Nyssen
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium.,Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, Université de Paris, 45 rue des Saints Pères, 75006 Paris, France
| | - Daniela Ajami
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Adrien Ardelean
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Florent Desroches
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Jing Li
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
| | - Michel Luhmer
- Laboratoire de Résonance Magnétique Nucléaire Haute Résolution, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/08, B-1050 Brussels, Belgium
| | - Olivia Reinaud
- Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, Université de Paris, 45 rue des Saints Pères, 75006 Paris, France
| | - Ivan Jabin
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium
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8
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Prakashni M, Shukla R, Dasgupta S. Rapid and High-Yield Synthesis of [23]Crown Ether: Applied as a Wheel Component in the Formation of Pseudo[2]rotaxane and Synthesis of [2]Catenane with a Dibenzylammonium Dumbbell. J Org Chem 2021; 86:7825-7831. [PMID: 34019406 DOI: 10.1021/acs.joc.1c00674] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A facile, rapid, and high yield synthesis of [23]crown ether (X23C7) has been developed from commercially available starting materials, in one step with good to excellent yield. The reaction is completed in 6 h under room temperature conditions, with the highest yield being 81%. The X23C7 macrocycle formed pseudo[2]rotaxane with a dibenzylammonium ion (DBA+) dumbbell, exhibiting strong association (Ka = 2.61 × 103 M-1). Consequently, a [2]catenane was synthesized from a DBA+-based diolefin terminated salt and X23C7 in 81% yield, using a threading-followed-ring-closing-metathesis approach.
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Affiliation(s)
- Manisha Prakashni
- Department of Chemistry, National Institute of Technology Patna, Patna - 800005, India
| | - Rasendra Shukla
- Department of Chemistry, National Institute of Technology Patna, Patna - 800005, India
| | - Suvankar Dasgupta
- Department of Chemistry, National Institute of Technology Patna, Patna - 800005, India
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9
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Kimura Y, Imai S, Takenaka M, Terashima T. Amphiphilic Random Cyclocopolymers as Versatile Scaffolds for Ring-Functionalized and Self-Assembled Materials. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00231] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshihiko Kimura
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Sahori Imai
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Mikihito Takenaka
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
- RIKEN Spring-8 Center, Sayo-cho, Sayo-gun, Hyogo 679-5148 Japan
| | - Takaya Terashima
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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10
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Structural Insights into the Host-Guest Complexation between β-Cyclodextrin and Bio-Conjugatable Adamantane Derivatives. Molecules 2021; 26:molecules26092412. [PMID: 33919170 PMCID: PMC8122645 DOI: 10.3390/molecules26092412] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 04/06/2021] [Accepted: 04/14/2021] [Indexed: 11/20/2022] Open
Abstract
Understanding the host–guest chemistry of α-/β-/γ- cyclodextrins (CDs) and a wide range of organic species are fundamentally attractive, and are finding broad contemporary applications toward developing efficient drug delivery systems. With the widely used β-CD as the host, we herein demonstrate that its inclusion behaviors toward an array of six simple and bio-conjugatable adamantane derivatives, namely, 1-adamantanol (adm-1-OH), 2-adamantanol (adm-2-OH), adamantan-1-amine (adm-1-NH2), 1-adamantanecarboxylic acid (adm-1-COOH), 1,3-adamantanedicarboxylic acid (adm-1,3-diCOOH), and 2-[3-(carboxymethyl)-1-adamantyl]acetic acid (adm-1,3-diCH2COOH), offer inclusion adducts with diverse adamantane-to-CD ratios and spatial guest locations. In all six cases, β-CD crystallizes as a pair supported by face-to-face hydrogen bonding between hydroxyl groups on C2 and C3 and their adjacent equivalents, giving rise to a truncated-cone-shaped cavity to accommodate one, two, or three adamantane derivatives. These inclusion complexes can be terminated as (adm-1-OH)2⊂CD2 (1, 2:2), (adm-2-OH)3⊂CD2 (2, 3:2), (adm-1-NH2)3⊂CD2 (3, 3:2), (adm-1-COOH)2⊂CD2 (4, 2:2), (adm-1,3-diCOOH)⊂CD2 (5, 1:2), and (adm-1,3-diCH2COOH)⊂CD2 (6, 1:2). This work may shed light on the design of nanomedicine with hierarchical structures, mediated by delicate cyclodextrin-based hosts and adamantane-appended drugs as the guests.
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11
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Zhu K, Loeb SJ. A hydrogen-bonded polymer constructed from mechanically interlocked, suit[1]ane monomers. CAN J CHEM 2020. [DOI: 10.1139/cjc-2020-0002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A T-shaped 2,4,7-substituted benzimidazolium “axle” with two ester functionalities and a 24-membered crown ether “wheel” with appendages containing terminal olefin groups were threaded — axle through wheel — to form a [2]pseudorotaxane. Grubbs’ ring-closing metathesis (RCM) was then used to form a third loop and create a bicyclic cage that fully encapsulates the axle and permanently interlocks the two molecular components creating a suit[1]ane. There are no bulky groups on the axle to prevent unthreading, but the axle is trapped due to the cage-like nature of the newly created polyether host. After hydrolysis of the esters groups to carboxylic acids, this novel mechanically interlocked molecule (MIM) polymerizes in the solid state. The structure of the resulting supramolecular polymer was determined by single-crystal X-ray diffraction and contains linear one-dimensional tapes of suit[1]ane monomers linked by intermolecular hydrogen bonding between the carboxylic acid groups.
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Affiliation(s)
- Kelong Zhu
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P.R. China
| | - Stephen J. Loeb
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
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12
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Zahim S, Ajami D, Laurent P, Valkenier H, Reinaud O, Luhmer M, Jabin I. Synthesis and Binding Properties of a Tren-Capped Hexahomotrioxacalix[3]arene. Chemphyschem 2020; 21:83-89. [PMID: 31659835 DOI: 10.1002/cphc.201900951] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 10/26/2019] [Indexed: 11/07/2022]
Abstract
The straightforward synthesis of a new hexahomotrioxacalix[3]arene-based ligand capped by a tren subunit was developed and the binding properties of the corresponding zinc complex were explored by NMR spectroscopy. Similarly to the closely related calix[6]tren-based systems, the homooxacalixarene core ensures the mononuclearity of the zinc complex and the metal center displays a labile coordination site for exogenous guests. However, very different host-guest properties were observed: i) in CDCl3 , the zinc complex strongly binds a water molecule and is reluctant to recognize other neutral guests, ii) in CD3 CN, the exo-coordination of anions prevails. Thus, in strong contrast to the calix[6]tren-based systems, the coordination of neutral guests that thread through the small rim and fill the polyaromatic cavity was not observed. This unique behaviour is likely due to the fact that the 18-membered ethereal macrocycle is too small to let a molecule threading through it. This work illustrates the key role played by the second coordination sphere in the binding properties of metal complexes.
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Affiliation(s)
- Sara Zahim
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, 1050, Brussels, Belgium
| | - Daniela Ajami
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, 1050, Brussels, Belgium
| | - Pascal Laurent
- Service de Chimie Générale, Université libre de Bruxelles (ULB), Route de Lennik 808, CP 609, 1070, Brussels, Belgium
| | - Hennie Valkenier
- Engineering of Molecular NanoSystems, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP165/64, 1050, Brussels, Belgium
| | - Olivia Reinaud
- Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Sorbonne Paris Cité, CNRS UMR 8601, Université Paris Descartes, 45 rue des Saints-Pères, 75006, Paris, France
| | - Michel Luhmer
- Laboratoire de Résonance Magnétique Nucléaire Haute Résolution, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/08, 1050, Brussels, Belgium
| | - Ivan Jabin
- Laboratoire de Chimie Organique, Université libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, CP160/06, 1050, Brussels, Belgium
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13
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Soto MA, Lelj F, MacLachlan MJ. Programming permanent and transient molecular protection via mechanical stoppering. Chem Sci 2019; 10:10422-10427. [PMID: 32110334 PMCID: PMC6988755 DOI: 10.1039/c9sc03744f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 09/28/2019] [Indexed: 01/09/2023] Open
Abstract
Chemical protection is an essential tool in synthetic chemistry, which involves blocking reactive sites on a molecule through covalent bonds. Physical approaches, such as encapsulation and host-mediated protection, have emerged as interesting alternatives that use steric bulk to inhibit reactivity. Here, we report the protection of a redox-active viologen through its incorporation into mechanically interlocked molecules (MIMs), namely hetero[4]rotaxanes. The viologen was confined inside a host cavity and flanked by two mechanical stoppers, which allowed for permanent and transient protection. Deprotection occurred on-demand via an unstoppering process, triggered by a proton transfer, polarity effect, or a thermal stimulus. We anticipate that permanent and transient mechanical stoppering could be incorporated into devices to function as molecular probes, transport/delivery systems, or stimuli-controlled degradable materials.
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Affiliation(s)
- Miguel A Soto
- Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , BC , V6T 1Z1 Canada .
| | - Francesco Lelj
- La.M.I. and LaSCAMM INSTM Sezione Basilicata , Dipartimento di Chimica , Università della Basilicata , via dell'Ateneo Lucano 10 , Potenza , 85100 Italy
| | - Mark J MacLachlan
- Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , BC , V6T 1Z1 Canada .
- Quantum Matter Institute , University of British Columbia , 2355 East Mall , Vancouver , BC , V6T 1Z4 Canada
- WPI Nano Life Science Institute , Kanazawa University , Kanazawa , 920-1192 Japan
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14
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Zhang Y, Ouyang Y, Luo Z, Dong S. Convenient, Column Chromatography-Free, and Effective Synthesis of Benzo-21-crown-7 and Its Derivatives. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900712] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yi Zhang
- College of Chemistry and Chemical Engineering; Hunan University; 410082 Changsha Hunan P. R. China
| | - Yunyun Ouyang
- College of Chemistry and Chemical Engineering; Hunan University; 410082 Changsha Hunan P. R. China
| | - Zheng Luo
- College of Chemistry and Chemical Engineering; Hunan University; 410082 Changsha Hunan P. R. China
| | - Shengyi Dong
- College of Chemistry and Chemical Engineering; Hunan University; 410082 Changsha Hunan P. R. China
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15
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Soto MA, MacLachlan MJ. Disabling Molecular Recognition through Reversible Mechanical Stoppering. Org Lett 2019; 21:1744-1748. [PMID: 30807186 DOI: 10.1021/acs.orglett.9b00310] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Mechanical stoppering of a guest molecule prevents its self-assembly with a macrocycle unit, so that both species coexist in a medium but do not recognize each other. The application of a chemical or physical stimulus reverses mechanical stoppering and subsequently enables molecular recognition. This process, which occurs without cross-reactivity and is perceptible at the macroscopic scale, could facilitate programming on/off states in supramolecular materials and molecular devices.
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Affiliation(s)
- Miguel A Soto
- Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , BC V6T 1Z1 , Canada
| | - Mark J MacLachlan
- Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , BC V6T 1Z1 , Canada.,WPI Nano Life Science Institute , Kanazawa University , Kanazawa , 920-1192 , Japan
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16
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Zheng XL, Tao RR, Gu RR, Wang WZ, Qu DH. A switchable [2]rotaxane with two active alkenyl groups. Beilstein J Org Chem 2018; 14:2074-2081. [PMID: 30202460 PMCID: PMC6122368 DOI: 10.3762/bjoc.14.181] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/17/2018] [Indexed: 11/23/2022] Open
Abstract
A novel functional [2]rotaxane containing two alkenyl bonds was designed, synthesized and characterized by 1H, 13C NMR spectroscopy and HRESI mass spectrometry. The introduction of alkenyl bonds endowed the [2]rotaxane a fascinating ability to react with versatile functional groups such as alkenyl and thiol functional groups. The reversible shuttling movement of the macrocycle between two different recognition sites on the molecular thread can be driven by external acid and base. This kind of rotaxane bearing functional groups provides a powerful platform for preparing stimuli-responsive polymers.
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Affiliation(s)
- Xiu-Li Zheng
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Rong-Rong Tao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Rui-Rui Gu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Wen-Zhi Wang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Da-Hui Qu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
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17
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Synthesis of spiro quasi[1]catenanes and quasi[1]rotaxanes via a templated backfolding strategy. Nat Commun 2017; 8:15392. [PMID: 28541349 PMCID: PMC5458513 DOI: 10.1038/ncomms15392] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 03/27/2017] [Indexed: 12/15/2022] Open
Abstract
Due to their well-defined three-dimensional geometry, spiro compounds are widely utilized in drug research. From the central tetrahedral carbon atom, besides the regular structure, an inverted spiro connectivity may be envisioned. Here we disclose the synthesis of this molecule class that we have coined quasi[1]catenanes. Next to their fascinating and aesthetic shape, the higher compactness as compared to regular spiro bicycles is noteworthy. To enable synthetic access to compact entangled multimacrocyclic molecules, we have developed a new strategy. The key element is a template, which is covalently connected to the linear precursors, and spatially directs the sterically congested backfolding macrocyclizations that are required to give quasi[1]catenanes. Similarly, quasi[1]rotaxanes are made. Spiro compounds contain two or more rings linked together through one common atom. Here the authors provide a method to backfold both rings, producing spiro quasi[1]catenanes, via a strategy of temporarily linking the linear intermediates with covalent bonds.
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18
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Zhu K, Baggi G, Vukotic VN, Loeb SJ. Reversible mechanical protection: building a 3D "suit" around a T-shaped benzimidazole axle. Chem Sci 2017; 8:3898-3904. [PMID: 28626559 PMCID: PMC5465563 DOI: 10.1039/c7sc00790f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 03/14/2017] [Indexed: 12/13/2022] Open
Abstract
The T-shaped benzimidazolium/crown ether recognition motif was used to prepare suit[1]anes. These novel mechanically interlocked molecules (MIMs) were fully characterized by 1H and 13C NMR spectroscopy, single-crystal X-ray diffraction, UV-vis absorption and fluorescence spectroscopy. By conversion to a suit[1]ane, a simple benzimidazole was shown to be protected from deprotonation by strong base. Moreover, it was demonstrated that this unique three-dimensional encapsulation can be made reversible, thus introducing the concept of "reversible mechanical protection"; a protecting methodology that may have potential applications in synthetic organic chemistry and the design of molecular machinery.
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Affiliation(s)
- Kelong Zhu
- School of Chemistry , Sun Yat-Sen University , Guangzhou , 510275 , P. R. China .
| | - Giorgio Baggi
- Department of Chemistry and Biochemistry , University of Windsor , Windsor , Ontario N9B 3P4 , Canada .
| | - V Nicholas Vukotic
- Department of Chemistry and Biochemistry , University of Windsor , Windsor , Ontario N9B 3P4 , Canada .
| | - Stephen J Loeb
- Department of Chemistry and Biochemistry , University of Windsor , Windsor , Ontario N9B 3P4 , Canada .
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19
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Sun Y, Fu W, Chen C, Wang J, Yao Y. Water-soluble pillar[5]arene induced the morphology transformation of self-assembled nanostructures and had further application in paraquat detection. Chem Commun (Camb) 2017; 53:3725-3728. [DOI: 10.1039/c7cc00291b] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hex-4ClPBI can self-assemble into nanotubes in water, and the tubular structures can be transformed into nanoribbons and further vesicles by addition of H+ and further WP5.
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Affiliation(s)
- Yan Sun
- College of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou
- P. R. China
| | - Wenxin Fu
- Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Chongyi Chen
- School of Materials Science and Chemical Engineering
- Ningbo University
- Ningbo
- China
| | - Jin Wang
- Research and Development Center
- China Tobacco Yunnan Industrial Co., Ltd
- Kunming
- China
| | - Yong Yao
- College of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou
- P. R. China
- Department of Chemistry
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20
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Dasgupta S, Mukherjee PS. Carboxylatopillar[n]arenes: a versatile class of water soluble synthetic receptors. Org Biomol Chem 2017; 15:762-772. [DOI: 10.1039/c6ob02214f] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Carboxylatopillar[n]arenes (CP[n]As, n = 5, 6, 7, 9, 10) constitute a family of water soluble synthetic receptors. These receptors are excellent hosts for a wide range of cationic organic molecules and have shown promising application in the fields of stimuli-responsive supramolecular assemblies, targeted drug delivery vehicles and sensors. Analogous metal-coordinated prismatic structures have shown excellent affinities for analytes.
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Affiliation(s)
- Suvankar Dasgupta
- Department of Chemistry
- National Institute of Technology Patna
- Patna-800005
- India
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21
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Gao Y, Zhou D, Zhao T, Wei X, McMahon S, O’Keeffe Ahern J, Wang W, Greiser U, Rodriguez BJ, Wang W. Intramolecular Cyclization Dominating Homopolymerization of Multivinyl Monomers toward Single-Chain Cyclized/Knotted Polymeric Nanoparticles. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01549] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | | | | | | | | | | | - Wei Wang
- School
of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | | | | | - Wenxin Wang
- School
of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
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22
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Hegemann JD, Zimmermann M, Xie X, Marahiel MA. Lasso peptides: an intriguing class of bacterial natural products. Acc Chem Res 2015; 48:1909-19. [PMID: 26079760 DOI: 10.1021/acs.accounts.5b00156] [Citation(s) in RCA: 251] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Natural products of peptidic origin often represent a rich source of medically relevant compounds. The synthesis of such polypeptides in nature is either initiated by deciphering the genetic code on the ribosome during the translation process or driven by ribosome-independent processes. In the latter case, highly modified bioactive peptides are assembled by multimodular enzymes designated as nonribosomal peptide synthetases (NRPS) that act as a protein-template to generate chemically diverse peptides. On the other hand, the ribosome-dependent strategy, although relying strictly on the 20-22 proteinogenic amino acids, generates structural diversity by extensive post-translational-modification. This strategy seems to be highly distributed in all kingdoms of life. One example for this is the lasso peptides, which are an emerging class of ribosomally assembled and post-translationally modified peptides (RiPPs) from bacteria that were first described in 1991. A wide range of interesting biological activities are known for these compounds, including antimicrobial, enzyme inhibitory, and receptor antagonistic activities. Since 2008, genome mining approaches allowed the targeted isolation and characterization of such molecules and helped to better understand this compound class and their biosynthesis. Their defining structural feature is a macrolactam ring that is threaded by the C-terminal tail and held in position by sterically demanding residues above and below the ring, resulting in a unique topology that is reminiscent of a lariat knot. The ring closure is achieved by an isopeptide bond formed between the N-terminal α-amino group of a glycine, alanine, serine, or cysteine and the carboxylic acid side chain of an aspartate or glutamate, which can be located at positions 7, 8, or 9 of the amino acid sequence. In this Account, we discuss the newest findings about these compounds, their biosynthesis, and their physicochemical properties. This includes the suggested mechanism through which the precursor peptide is enzymatically processed into a mature lasso peptide and crucial residues for enzymatic recognition. Furthermore, we highlight new insights considering the protease and thermal stability of lasso peptides and discuss why seven amino acid residue rings are likely to be the lower limit feasible for this compound class. To elucidate their fascinating three-dimensional structures, NMR spectroscopy is commonly employed. Therefore, the general methodology to elucidate these structures by NMR will be discussed and pitfalls for these approaches are highlighted. In addition, new tools provided by recent investigations to assess and prove the lasso topology without a complete structure elucidation will be summarized. These include techniques like ion mobility-mass spectrometry and a combined approach of thermal and carboxypeptidase treatment with subsequent LC-MS analysis. Nevertheless, even though much was learned about these compounds in recent years, their true native function and the exact enzymatic mechanism of their maturation remain elusive.
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Affiliation(s)
- Julian D. Hegemann
- Department of Chemistry,
Biochemistry and LOEWE-Center
for Synthetic Microbiology, Philipps-University Marburg, Hans-Meerwein-Strasse
4, D-35032, Marburg, Germany
| | - Marcel Zimmermann
- Department of Chemistry,
Biochemistry and LOEWE-Center
for Synthetic Microbiology, Philipps-University Marburg, Hans-Meerwein-Strasse
4, D-35032, Marburg, Germany
| | - Xiulan Xie
- Department of Chemistry,
Biochemistry and LOEWE-Center
for Synthetic Microbiology, Philipps-University Marburg, Hans-Meerwein-Strasse
4, D-35032, Marburg, Germany
| | - Mohamed A. Marahiel
- Department of Chemistry,
Biochemistry and LOEWE-Center
for Synthetic Microbiology, Philipps-University Marburg, Hans-Meerwein-Strasse
4, D-35032, Marburg, Germany
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23
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24
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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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25
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Dasgupta S, Chowdhury A, Mukherjee PS. Binding of carboxylatopillar[5]arene with alkyl and aryl ammonium salts in aqueous medium. RSC Adv 2015. [DOI: 10.1039/c5ra13195b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Alkyl ammonium salts exhibited strong binding with carboxylatopillar[5]arene in aqueous medium which resulted in the formation of pseudo[2]rotaxane and pseudo[3]rotaxane species.
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Affiliation(s)
- Suvankar Dasgupta
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore-560012
- India
| | - Aniket Chowdhury
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore-560012
- India
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26
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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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27
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Li H, Li X, Cao ZQ, Qu DH, Ågren H, Tian H. A switchable bis-branched [1]rotaxane featuring dual-mode molecular motions and tunable molecular aggregation. ACS APPLIED MATERIALS & INTERFACES 2014; 6:18921-18929. [PMID: 25302680 DOI: 10.1021/am506283g] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A multifunctional bis-branched [1]rotaxane containing a perylene bisimide (PBI) core and two identical bistable[1]rotaxane arms terminated with ferrocene units was prepared and characterized by (1)H NMR, (13)C NMR, and 2D ROESY NMR spectroscopies and by HR-ESI spectrometry. The system is shown to possess several key features: (1) In acetone solution, external acid-base stimuli can result in relative mechanical movements of its ring and thread, which can induce extension and contraction movements of the whole system accompanied by a rotational movement of the ferrocene units, thus realizing dual-mode molecular motions, and the optimized conformations at different states are obtained through molecular dynamics simulations employing the general Amber force field. (2) The introduction of PBI enables the system fluorescence encoding through distance-dependent photoinduced electron transfer process from the ferrocene units to the PBI fluorophore. (3) The addition of Zn(2+) can increase the degree of aggregation of the system, while adding base hinders aggregation because of the movement of the macrocycle. The tunable aggregated nanostructural morphologies of [1]rotaxane were examined by scanning electron microscopy. These results can pave the way to achieve precise control of integrated and coupling nanomechanical motions at a single-molecule level and provide more insight into controlling the aggregate behavior of switchable mechanically interlocked molecules.
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Affiliation(s)
- Hong Li
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology , Shanghai 200237, People's Republic of China
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28
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Nagai H, Suzaki Y, Osakada K. Thiacrown Ethers with Oxygen and Sulfur for Coordination: Formation of the Pd and Pt Complexes and Pseudorotaxane with Dialkylammonium. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402465] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2012. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.02.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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30
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Li H, Li X, Wu Y, Agren H, Qu DH. A musclelike [2](2)rotaxane: synthesis, performance, and molecular dynamics simulations. J Org Chem 2014; 79:6996-7004. [PMID: 25028771 DOI: 10.1021/jo501127h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A novel bistable symmetric [2](2)rotaxane was prepared by a threading-followed-by-stoppering strategy and characterized with (1)H, (13)C, and 2D ROESY NMR spectroscopy and HR-ESI spectrometry. The symmetric [2](2)rotaxane system consists of an anthracene-based bis(crown ether) as macrocycles, and each of the two dibenzo[24]crown-8 (DB24C8) rings is threaded by the pendant substituents of a symmetrically substituted central rotatable ferrocene subunit that possesses two distinguishable recognition sites for the DB24C8 ring: namely, a dibenzylammonium site and an N-methyltriazolium site. The uniform shuttling motion of the thread relative to the two DB24C8 rings in [2](2)rotaxane can be driven by external acid-base stimuli, which was evidenced by (1)H and 2D ROESY NMR spectroscopy. Furthermore, molecular dynamics simulations of the [2](2)rotaxane were carried out both in protonated (stretched) and in neutral (contracted) forms. The calculated percentage change in molecular length of the [2](2)rotaxane between the two end-capping bis(methoxyl)phenyl groups is about 48% in the two different states (in acetone), which is much larger than the percentage change (∼27%) in human muscle. Moreover, in the two states, the C*-Cp-Cp-C* dihedral angles are computed as -177° in the stretched state and -112° in the contracted state, indicating a correlation between the translational and rotational motions of the [2](2)rotaxane.
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Affiliation(s)
- Hong Li
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology , Shanghai 200237, People's Republic of China
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31
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Zhu K, Vukotic VN, O’Keefe CA, Schurko RW, Loeb SJ. Metal–Organic Frameworks with Mechanically Interlocked Pillars: Controlling Ring Dynamics in the Solid-State via a Reversible Phase Change. J Am Chem Soc 2014; 136:7403-9. [DOI: 10.1021/ja502238a] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Kelong Zhu
- Department
of Chemistry and
Biochemistry, University of Windsor, Windsor, Ontario Canada, N9B 3P4
| | - V. Nicholas Vukotic
- Department
of Chemistry and
Biochemistry, University of Windsor, Windsor, Ontario Canada, N9B 3P4
| | - Christopher A. O’Keefe
- Department
of Chemistry and
Biochemistry, University of Windsor, Windsor, Ontario Canada, N9B 3P4
| | - Robert W. Schurko
- Department
of Chemistry and
Biochemistry, University of Windsor, Windsor, Ontario Canada, N9B 3P4
| | - Stephen J. Loeb
- Department
of Chemistry and
Biochemistry, University of Windsor, Windsor, Ontario Canada, N9B 3P4
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32
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Hegemann JD, Zimmermann M, Zhu S, Steuber H, Harms K, Xie X, Marahiel MA. Xanthomonine I-III: eine neue Klasse von Lassopeptiden mit einem Makrolactamring aus sieben Aminosäureresten. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309267] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Hegemann JD, Zimmermann M, Zhu S, Steuber H, Harms K, Xie X, Marahiel MA. Xanthomonins I-III: A New Class of Lasso Peptides with a Seven-Residue Macrolactam Ring. Angew Chem Int Ed Engl 2014; 53:2230-4. [DOI: 10.1002/anie.201309267] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Indexed: 11/06/2022]
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34
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Zhang JN, Li H, Zhou W, Yu SL, Qu DH, Tian H. Fluorescence modulation in tribranched switchable [4]rotaxanes. Chemistry 2013; 19:17192-200. [PMID: 24203853 DOI: 10.1002/chem.201303026] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 09/05/2013] [Indexed: 11/10/2022]
Abstract
Two novel tribranched [4]rotaxanes with a 1,3,5-triphenylene core and three rotaxane arms have been designed, synthesized, and characterized by (1)H and (13)C NMR spectroscopies and HR-ESI mass spectrometry. [4]Rotaxanes 1 and 2 each possess the same three-armed skeleton. Each arm incorporates two distinguishable binding sites for a dibenzo[24]crown-8 ring, namely a dibenzylammonium site and an N-methyltriazolium site, and is terminated by a 4-morpholino-naphthalimide fluorophore as a stopper. [4]Rotaxane 1 has three di-ferrocene-functionalized dibenzo[24]crown-8 rings whereas 2 has three simple dibenzo[24]crown-8 rings interlocked with the thread component. Uniform shuttling motions of the three macrocycles in both 1 and 2 can be driven by external acid-base stimuli, which were confirmed by (1)H NMR spectroscopy. However, [4]rotaxanes 1 and 2 show distinct modes of fluorescence modulation in response to external acid-base stimuli. [4]Rotaxane 1 exhibits a remarkable fluorescence decrease in response to the addition of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as a base, which can displace the ferrocene-functionalized macrocycle from the dibenzylammonium station to the N-methyltriazolium station. In contrast, the fluorescence intensity of [4]rotaxane 2 showed an enhancement with the addition of DBU. Time-resolved fluorescence measurements have been performed. The different photoinduced electron-transfer processes responsible for the fluorescence changes in the two molecular systems are discussed. Topological structures of this kind have significant potential for the design and construction of large and complex assemblies with controllable functions.
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Affiliation(s)
- Ji-Na Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-64252288
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35
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Li H, Zhang JN, Zhou W, Zhang H, Zhang Q, Qu DH, Tian H. Dual-Mode Operation of a Bistable [1]Rotaxane with a Fluorescence Signal. Org Lett 2013; 15:3070-3. [DOI: 10.1021/ol401251u] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hong Li
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Ji-Na Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Wei Zhou
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Hui Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Qiong Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Da-Hui Qu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - He Tian
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
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36
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Han Y, Guo JB, Cao J, Chen CF. Ion-controlled switchable complexation between pentiptycene-based tweezer-like hosts and self-folding guests. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.04.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Han Y, Cao J, Li PF, Zong QS, Zhao JM, Guo JB, Xiang JF, Chen CF. Complexation of Triptycene-Derived Macrotricyclic Polyether with Paraquat Derivatives, Diquat, and a 2,7-Diazapyrenium Salt: Guest-Induced Conformational Changes of the Host. J Org Chem 2013; 78:3235-42. [DOI: 10.1021/jo400148b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Ying Han
- Beijing National Laboratory for Molecular
Sciences, CAS Key Laboratory of Molecular Recognition and Function,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Cao
- Beijing National Laboratory for Molecular
Sciences, CAS Key Laboratory of Molecular Recognition and Function,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Peng-Fei Li
- Beijing National Laboratory for Molecular
Sciences, CAS Key Laboratory of Molecular Recognition and Function,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qian-Shou Zong
- Beijing National Laboratory for Molecular
Sciences, CAS Key Laboratory of Molecular Recognition and Function,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jian-Min Zhao
- Beijing National Laboratory for Molecular
Sciences, CAS Key Laboratory of Molecular Recognition and Function,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jia-Bin Guo
- Beijing National Laboratory for Molecular
Sciences, CAS Key Laboratory of Molecular Recognition and Function,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jun-Feng Xiang
- Beijing National Laboratory for Molecular
Sciences, CAS Key Laboratory of Molecular Recognition and Function,
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, 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
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38
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Zheng B, Zhang M, Yan X, Huang F. Threaded structures based on the benzo-21-crown-7/secondary ammonium salt recognition motif using esters as end groups. Org Biomol Chem 2013; 11:3880-5. [DOI: 10.1039/c3ob40577j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Xu XD, Ou-Yang JK, Zhang J, Zhang YY, Gong HY, Yu Y, Yang HB. Self-assembly of supramolecular tris(crown ether) hexagons with dendritic dibenzylammonium cations. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.11.065] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Zhou W, Guo YJ, Qu DH. Photodriven Clamlike Motion in a [3]Rotaxane with Two [2]Rotaxane Arms Bridged by an Overcrowded Alkene Switch. J Org Chem 2012; 78:590-6. [DOI: 10.1021/jo302426c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Wei Zhou
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Ya-Jing Guo
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Da-Hui Qu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
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Caputo CB, Zhu K, Vukotic VN, Loeb SJ, Stephan DW. Heterolytic Activation of H2Using a Mechanically Interlocked Molecule as a Frustrated Lewis Base. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207783] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Caputo CB, Zhu K, Vukotic VN, Loeb SJ, Stephan DW. Heterolytic Activation of H2Using a Mechanically Interlocked Molecule as a Frustrated Lewis Base. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/anie.201207783] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Li H, Zhang H, Zhang Q, Zhang QW, Qu DH. A Switchable Ferrocene-Based [1]Rotaxane with an Electrochemical Signal Output. Org Lett 2012; 14:5900-3. [DOI: 10.1021/ol302826g] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Hong Li
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Hui Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Qiong Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Qi-Wei Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
| | - Da-Hui Qu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
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Dasgupta S, Huang KW, Wu J. Trifluoromethyl acting as stopper in [2]rotaxane. Chem Commun (Camb) 2012; 48:4821-3. [DOI: 10.1039/c2cc31009k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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